02ic(interface configuration command)

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User Manual - Configuration Guide (Volume 1)

Versatile Routing Platform Table of Contents

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Table of Contents

Chapter 1 Interface Configuration Overview ......... ......... ........ ......... ........ ......... ........ ......... .. 1-1

1.1 Interface Overview....................................................................................................1-1

1.2 Interface Configuration..............................................................................................1-1

1.2.1 Interface Configuration Mode ......... ........ ......... ........ ......... ......... ........ ......... ...... 1-1

1.2.2 Set Interface Description............. ........ ......... ......... ........ ......... ........ ......... ........ . 1-2

1.2.3 Set Time Interval for Flow Control Statistics......... ......... ........ ......... ........ ......... .. 1-2

1.3 Interface Configuration Method......... ........ ......... ........ ......... ........ ......... ........ ......... ..... 1-2

1.4 Interface Monitoring and Maintenance................ ........ ......... ........ ......... ........ ......... ..... 1-3

Chapter 2 Configuring LAN Interface .................................................................................. 2-1

2.1 Ethernet Interface .....................................................................................................2-1

2.1.1 Ethernet Interface Overview.. ......... ........ ......... ........ ......... ......... ........ ......... ...... 2-1

2.1.2 Configuring Ethernet Interface........ ........ ......... ........ ......... ......... ........ ......... ...... 2-1

2.1.3 Monitoring and Maintenance of Ethernet Interface......... ........ ......... ........ ......... .. 2-4

2.1.4 Typical Ethernet Interface Configuration Example ......... ........ ......... ........ ......... .. 2-4

2.1.5 Fault Diagnosis and Troubleshooting of Ethernet Interface........ ......... ........ ........ 2-5

Chapter 3 Configuring WAN Interface ......... ......... ........ ......... ........ ......... ........ ......... ........ .... 3-1

3.1 Asynchronous Serial Port .......................................................................................... 3-1

3.1.1 Asynchronous Serial Ports Overview............... ........ ......... ......... ........ ......... ...... 3-1

3.1.2 Configuring Asynchronous Serial Port ......... ........ ......... ........ ......... ........ ......... .. 3-1

3.2 AUX Interface........................................................................................................... 3-7

3.2.1 Introduction to AUX Interface ......... ........ ......... ........ ......... ......... ........ ......... ...... 3-7

3.2.2 AUX Interface Configuration......... ......... ........ ......... ......... ........ ......... ........ ........ 3-7

3.3 Synchronous Serial Port ......... ........ ......... ........ ......... ........ ......... ......... ........ ......... ...... 3-7

3.3.1 Synchronous Serial Ports Overview........ ......... ........ ......... ......... ........ ......... ...... 3-7

3.3.2 Configuring Synchronous Serial Port ........ ........ ......... ........ ......... ........ ......... ..... 3-8

3.4 ISDN BRI Interface........ ......... ........ ......... ........ ......... ........ ......... ......... ........ ......... .... 3-13

3.4.1 ISDN BRI Interface Overview................ ........ ......... ......... ........ ......... ........ ...... 3-133.4.2 Configuring ISDN BRI Interface.......... ......... ........ ......... ........ ......... ........ ......... 3-14

3.5 cE1/PRI Interface.................................................................................................... 3-14

3.5.1 cE1/PRI Overview ......................................................................................... 3-14

3.5.2 Configuring cE1/PRI Interface........ ........ ......... ........ ......... ......... ........ ......... .... 3-15

3.5.3 Monitoring and Maintenance of cE1/PRI Interface ......... ........ ......... ........ ......... 3-19

Chapter 4 Configuring Logic Interface ........ ......... ........ ......... ........ ......... ........ ......... ........ .... 4-1

4.1 Dialer Interface ......................................................................................................... 4-1

4.1.1 Dialer Interface Overview......... ......... ........ ......... ........ ......... ........ ......... ........ .... 4-1

4.1.2 Configuring Dialer Interface......... ........ ......... ......... ........ ......... ........ ......... ........ . 4-1


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Versatile Routing Platform Table of Contents

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4.2 Sub-Interface............................................................................................................ 4-1

4.2.1 Sub-Interface Overview ................................................................................... 4-1

4.2.2 Configuring Sub-Interface.. ......... ........ ......... ......... ........ ......... ........ ......... ........ . 4-2

4.3 Backup Center Logic Channel........ ........ ......... ........ ......... ......... ........ ......... ........ ........ 4-5

4.3.1 Backup Center Logic Channel Overview.............. ......... ........ ......... ........ ......... .. 4-5

4.3.2 Configuring Backup Center Logic Channel........ ......... ........ ......... ........ ......... ..... 4-5

4.4 Virtual-Template and Virtual Interface........ ......... ........ ......... ........ ......... ........ ......... ..... 4-5

4.4.1 Virtual-Template and Virtual Interface Overview ......... ........ ......... ........ ......... ..... 4-5

4.4.2 Configuring Virtual-Template........ ......... ........ ......... ......... ........ ......... ........ ........ 4-5

4.4.3 Monitoring and Maintenance of Virtual-Template and Virtual Interface.......... ...... 4-7

4.4.4 Fault Diagnosis and Troubleshooting of Virtual-Template......... ........ ......... ........ . 4-7


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Versatile Routing Platform

Chapter 1Interface Configuration Overview

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Chapter 1 Interface Configuration Overview

1.1 Interface Overview

The router interface refers to the part through which the router system exchanges data

and interacts with other devices in the network. It functions to implement dataexchange between the router and other network devices.

VRP supports physical interface and logic interface on the router.

Physical interface is an interface actually exists and can be supported by

corresponding devices, such as the Ethernet interface and synchronous/asynchronous

serial port. There are two types of physical interfaces. One is LAN interface, whichmainly refers to the Ethernet interface through which the router can exchange data with

the network devices in LAN. The other is WAN interface includingsynchronous/asynchronous serial port, asynchronous serial port, AUX interface,cE1/PRI, ISDN BRI and voice interface, etc. Through the WAN interface, the router canexchange data with the network devices in the external network.

Logic interface is an interface doesn t physically exist and needs to be established

through configuration, and can also exchange data. Logic interface includes the Dialerinterface, sub-interface, backup center logic channel and virtual-template.

1.2 Interface Configuration

1.2.1 Interface Configuration Mode

To facilitate configuration and maintenance of the interface, the interface configuration

mode is set in VRP software. Interface commands will be effective only when used inthe configuration mode of relevant interfaces.

I. Entering the interface configuration mode.

With interface command in the global configuration mode, you can enter the specified

configuration mode of the interface.

Table IC-1-1 Enter configuration mode of specified interface

Operation Command

Enter configuration mode of specified interface interface interface-type interface-number

Examples:

Input interface ethernet 0 in the global configuration mode to enter the configurationmode of Ethernet interface numbered 0.

Quidway (config)#interface ethernet 0

Quidway (config-if-Ethernet0)#


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& Note:

In VRP, the command to enter E1 interface configuration mode is controller e1, which is different from thecommand of other interfaces.

II. Exiting the interface configuration mode.

In the interface configuration mode, input exit to return to the global configurationmode.

1.2.2 Set Interface Description

VRP has a configuration item of interface description for router s physical interface.

Interface description is mainly used to help identify the usage of interface. Please use

this command in interface configuration mode.

Table IC-1-2 Set interface description

Operation Command

Set interface description description interface-description

Recover default interface description. no description

1.2.3 Set Time Interval for Flow Control Statistics

VRP system counts interface flow every interval time and calculates unit flow as thereference for backup center. Other flow control methods (including the dialerthreshold command of DDR-MP) need this parameter. This command is used to set

the time interval for performing flow statistics on interfaces. It can be used on anyinterfaces.

Perform the following task in global configuration mode.

Table IC-1-3 Set interface description

Operation Command

Set interval time for flow control on the interface flow-interval interval-time

Interval time is 5 minutes by default.

1.3 Interface Configuration Method

Before configuring an interface, it is necessary to have a clear idea about the

networking requirement and networking diagram. Following operations must beimplemented at least for the interface configuration.

l If this interface is a physical interface, be clear about the connection state, workingmode of the physical interface to be selected and related working parameters.

l If this interface is a WAN interface, appoint the encapsulated link layer protocol

and working parameters that should be abided by for the opposite port connected

with this interface.


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l Configure network protocol (such as IP) address of this interface.l Configure the static route that can reach the destination network via this interface,

or configure working parameters of the dynamic route protocol on this interface.l If this interface supports dial, please configure dial mapping, DDR working

parameters and management to Modem.l If this interface acts as the main interface or backup interface at the backup center,

please configure related working parameters of the backup center.l If the firewall is to be established on this interface, please configure parameters

about related message filtering or address conversion.

There are lots of parameters to be configured in the interface mode. So, this part will

mainly introduce configurations of some parameters special for the physical interface,and briefly introduce the logic interface definition. Configurations about the link layerprotocol, network layer protocol, parameter and some special functions (such as dial,

backup center, and firewall) will be introduced specially in other parts of this manualand no further details are provided here.

1.4 Interface Monitoring and Maintenance

Please use the following commands in relevant configuration mode.

Table IC-1-4 Interface monitoring and maintenance

Operation Command

Show current running state and statistic information of theinterface (in any configuration mode)

show interface [interface-type interface-number]

Clear interface statistic information (in privileged user mode) clear port [interface-type interface-number]

Shut down interface (in interface configuration mode) shutdown

Restart interface (in interface configuration mode) no shutdown

These commands are described respectively as follows:

1) show interface command displays current running state and statistic informationof the interface If relevant interface name is not specified, the running states and

statistic information of all interfaces will be displayed. That is:

To view information of all interfaces, enter:

Quidway#show interface

To view information of specific interface, such as Serial 0, enter:

Quidway#show interface serial 0

For example: after executing the command show interface serial 0, the followinginformation is displayed:

Serial0 is down, line protocol is downDescript: HUAWEI, Quidway Router, Serial InterfaceThe Maximum Transmit Unit is 1500. The keepalive is 10(sec)Internet Address is 10.110.10.15/21Encapsulation is PPPLCP initialQueueing strategy: FIFOOutput queue: (size/max/drops) 0/75/0Interface is no cable, baudrate is 64000

5 minutes input rate 0 bytes/sec, 0 packets/sec5 minutes output rate 0 bytes/sec, 0 packets/sec0 packets input, 0 bytes0 input error0 packets output, 0 bytes


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0 output errorDCD=DOWN DTR=DOWN DSR=DOWN RTS=DOWN CTS=DOWN

The above information includes:

l Physical state and protocol state of the interface.l Interface physical features (synchronous/asynchronous, DTE/DCE, clock

selection, baud rate and external cable).

l Interface IP address.l Interface-encapsulated link layer protocol, link layer protocol running state and

statistic information.

l Statistic information of input/output message of interface2) clear port command is used to clear the statistic information of input/output

message of the interface. If relevant interface name is not specified, the statistic

information of all interfaces will be cleared.3) shutdown/no shutdown command is used to shut down and restart interface.

Sometimes, the modification of interface parameters can not take effect

immediately. In this case, the new parameters can not take effect unless theinterface is shut down first and then restarted.

4) Automatic output of the interface state information.

When the physical or protocol state of the interface changes, the system will

automatically output related prompt information as shown in following table.

Table IC-1-5 Interface state information

Interface state information Meaning

%interface-name is shutdown The interface is shut down by the user.

%interface-name is reset The interface is restarted by the user.

%Interface interface-name changed state to DOWNThe physical state of the interface ischanged to DOWN

%Interface interface-name changed state to UPThe physical state of the interface ischanged to UP

%Line protocol protocol-name on interface interface-name, changedstate to DOWN

The protocol state of the interface ischanged to DOWN

%Line protocol protocol-nameon interface interface-name, changed

state to UP

The protocol state of the interface is

changed to UP


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Chapter 2Configuring LAN Interface

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Chapter 2 Configuring LAN Interface

The local area network (LAN) mainly includes Ethernet and Token-Ring network.

Currently, Ethernet has become the most important LAN networking technology thanksto its high flexibility, relative simplicity and easy implementation.

Presently, VRP-supported LAN interface is Ethernet interface, including conventional

Ethernet interface and fast Ethernet interface.

2.1 Ethernet Interface

2.1.1 Ethernet Interface Overview

Ethernet interface of Quidway series router comprises conventional Ethernet interface

and fast Ethernet interface.

The conventional Ethernet interface complies with 10Base-T physical layerspecifications, working at 10Mbit/s and in two modes: full duplex and half duplex.

The fast Ethernet interface complies with 100Base-T and also 10Base-T physical layer

specifications, working at 10Mbit/s or 100Mbit/s, and in two modes: half duplex and full

duplex. With the auto-negotiation capability, it can consult other network devices todetermine and automatically select the optimum working mode and rate, thus greatlysimplifying the configuration and management of the system.

The configuration of conventional Ethernet interface is basically the same as that of fastEthernet interface. But the former is simpler, and has less configuration items.Therefore, this chapter mainly introduces the configuration of fast Ethernet interface.

2.1.2 Configuring Ethernet Interface

I. Configuration task list of Ethernet interface

l Enter configuration mode of specified Ethernet interface

l Set network protocol addressl Set frame format of sending messagel Set MTU

l Select working rate of fast Ethernet interfacel Select working mode of Ethernet interfacel Enable or disable internal loopback.

The specified Ethernet interface can not be configured unless you enter its

configuration mode. It's necessary to configure IP address. For other parameters, it's

recommended to use default values, which can ensure the system to work normally inmost cases.

II. Entering configuration mode of specified Ethernet interface

Please use the following command in the global configuration mode.


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Table IC-2-1 Enter configuration mode of specified Ethernet interface

Operation Command

Enter configuration mode of specified Ethernet interface interf ace ethernet interface-number

III. Setting network protocol address

VRP supports IP and IPX at Ethernet interface. Therefore, it is necessary to configure

IP or IPX network address. Please refer to Network Protocol Configuration partin thismanual.

Please use the following commands in Ethernet interface configuration mode.

Table IC-2-2 Set IP network protocol address

Operation CommandSet IP network protocol address ip address ip-address ip-mask [secondary ]

Cancel IP network protocol address no ip address ip-address ip-mask [secondary]

When an Ethernet interface is configured with two or more IP addresses, use keyword

"secondary" to identify them.

Table IC-2-3 Set IPX network protocol address

Operation Command

Specify IPX network node value ipx routing [node]

Delete IPX network node value. no ipx routing

Specify IPX network number ipx networknetwork-numberDelete IPX network number no ipx network

node value is the MAC address of the first Ethernet interface in the router by default.

The ipx routing command and no ipx routing command should be used in global

configuration mode.

IV. Setting frame format of sending message

Both Ethernet_ II and Ethernet_ SNAP can support IP and IPX. The Ethernet interface

can identify these two formats out of received frame, but can only choose one frame

format for the sent frame.


Table IC-2-4 Set frame format of sending message

Operation Command

Set frame format of sending message send-frame-type {Ethernet_II | Ethernet_SNAP}

Recover default frame format of sending message no send-frame-type

The frame format of sending message is Ethernet_II by default.


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V. Setting MTU

Maximum transmission unit (MTU) will influence the fragmentation and reassembling of

network message.


Table IC-2-5 Set MTU

Operation Command

Set MTU mt u ethernet-mtu

Recover MTU default value no mtu

Value ranges and default values of MTUs with different link layer encapsulation formats

are different. When Ethernet_II frame format is adopted, MTU value range will be 46-1500 with default value 1500, and when Ethernet_SNAP frame format is adopted, MTU

value range will be 46-1492 with default value 1492.

VI. Selecting working rate of fast Ethernet interface

As described before, the fast Ethernet interface can work at rates of 10Mbit/s and

100Mbit/s. Therefore, it is possible to select interface working rate with followingcommand in Ethernet interface configuration mode.

Table IC-2-6 Select working rate of fast Ethernet interface

Operation Command

Select working rate of fast Ethernet interface speed {auto | 100 | 10}

The default is Auto, i.e. the system automatically chooses an optimum working rate.

The user can also specify the interface working rate. But the rate specified must be thesame as that of the actually connected network.

VII. Selecting working mode of Ethernet interface

As described above, the Ethernet interface can work in full duplex or half duplex mode.

The router Ethernet interface should work in half duplex mode when connected withHUB and in full duplex mode when connected with LANSwitch. Therefore, it is possibleto select working mode with the following command in Ethernet interface configurationmode.

Table IC-2-7 Select working mode of Ethernet interface

Operation Command

Select working mode of Ethernet interface duplex {auto | full | half}

The default is Auto, i.e. the system automatically chooses an optimum working mode.

VIII. Enabling or disabling internal loopback.

When performing special function test to Ethernet interface, it needs to be set as

internal loopback sometimes. Therefore, it is possible to enable internal loopback with

the following commands in Ethernet interface configuration mode.


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Table IC-2-8 Enable or diable internal sel-loop

Operation Command

Enable internal loopback loopback

Enable internal loopback no loopback

The default is to disable internal loopback.

2.1.3 Monitoring and Maintenance of Ethernet Interface

The following command can be used to specify the state of Ethernet interface in

privileged user mode, so that specified Ethernet interface can be monitored andmaintained.

Table IC-2-9 Show the state of specified Ethernet interface

Operation Command

Show the state of specified Ethernet interface show interface ethernet interface-number

For example:

! Show the state of Ethernet 0

Quidway#show interface ethernet 0

The system displays:

Ethernet0 is up, line protocol is downHardware address is 00-e0-fc-00-00-00

Auto-Negotiation is enabled, Duplex AUTO, Speed AUTOInternet address is 10.111.0.8 255.255.0.0 10.111.255.255Description: Quidway Router, ethernet interfaceIP Sending Frames' Format is Ethernet_IIthe Maximum Transmission Unit is 15005 minutes input rate 0.00 bytes/sec, 0.00 packets/sec5 minutes output rate 0.00 bytes/sec, 0.00 packets/secInput queue: (size/max/drops)0/1000/0Queueing strategy: FIFOOutput Queue: (size/max/drops)0/75/00 packets input, 0 bytes, 0 no buffers0 packets output, 0 bytes, 0 no buffers0 input errors, 0 CRC, 0 frame errors

0 overrunners, 0 aborted sequences, 0 input no buffers

The information displayed above includes the physical state, line state, network

protocol address, frame encapsulation format and statistic information abouttransceiving message of this Ethernet interface.

2.1.4 Typical Ethernet Interface Configuration Example

I. Networking requirement

As shown below, the Ethernet interfaces of routers A, B, and C are connected

respectively to IP networks 10.24.40.0, 129.102.0.0 and 202.38.165.0. And these three

routers are connected together via frame relay network.


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II. Networking diagram

EthernetEthernet

Router A

Interface address:

Router B Router C

Frame RelayNetwork

k

Network address:131.109.1.0

Network address:129.125.1. 0

Interface address :Interface address:

Network address:

Interface address:

129.102.0.0

Network address:

Ethernet

202.38.165.1

202.38.165.2

10.24.40.0

10.24.40.1

129.102.0. 1

Figure IC-1-1 Networking diagram of Ethernet configuration example

III. Configuration procedure

1) Configure Router A

! Specify the IP address as 10.24.40.1 and the mask as 255.255.255.0.

Quidway (config-if-Ethernet0)#ip address 10.24.40.1 255.255.255.0

! Set MTU of the interface to 1492 bytes and frame format to Ethernet_II.

Quidway(config-if-Ethernet0)# mtu 1492

Quidway(config-if-Ethernet0)# send-frame-type Ethernet_II

2) Configure Router B

! Specify the IP address as 202.38.165.1 and the mask as 255.255.255.0.





3) Configure Router C

! Specify the IP address to be 129.102.0.1 and the mask to be 255.255.255.0.





2.1.5 Fault Diagnosis and Troubleshooting of Ethernet Interface

The following test methods can be used to judge whether Ethernet interface is faulty:


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l Ping the Ethernet interface from the host located in the same LAN as the router toobserve whether the returned messages are correct.

l View the statistic information of two ends of the connection (such as the router andswitch) to observe whether the statistic number of the received error frames

increases quickly.If either test fails to pass, it indicates that the Ethernet interface of the router or the

connected Ethernet is abnormal.

After confirming the fault, proceed as follows:

Step 1: View whether the LAN connection between the host and router is correct.

If the Ethernet is connected with HUB or LAN Switch, please check the status of

relevant link indicators on HUB or LAN Switch. If the indicators are on, it means that theEthernet interfaces of the host & router and the network cable are physically correct.Otherwise, please replace such physical equipment as the network adapter, networkcable, router or relevant interface module.

When the Ethernet is connected with unshielded twisted pair and at least one of theconnection parties supports 100Base-TX, rate matching must be taken intoconsideration. If the working rates of two parties do not match, i.e. one works in

100Mbit/s mode while the other works in 10Mbit/s mode, then the fault is that the partywith 100Mbit/s configuration shows no connection, while the party with 10Mbit/sconnection shows the connection has been established. Furthermore, the activity

indicator of the physical layer blink quickly and messages can t be received ortransmitted normally.

On checking the connection of fast Ethernet interface of Quidwayseries router, the

following prompt information is very helpful. Both these two pieces of information are

output on the control console when the user is executing the rate selection command orconnecting the network cable.

Ethernet 0: Warning--the link partner do not support 100M modeEthernet 0: Warning--the link partner may not support 10M mode

Here, the first piece of prompt information indicates that the opposite end, which is

detected by the Ethernet interface of Quidway series router, does not support100Mbit/s working rate, while the local end is working at 100Mbit/s rate by force. At this

time, the user should ensure the opposite has been configured correspondingly and isworking in rate of 100Mbit/s. The second prompt information indicates that the opposite,detected by the Ethernet interface of Quidway series router, may not support 10Mbit/s

working rate, while the local end is forced to work in 10Mbit/s rate. Now, the user shouldensure the opposite end to work at the rate of 10Mbit/s. However, when the Ethernetinterface of Quidway series router is connecting 10/100Mbit/s adaptive port of HUB,this information doesn t mean setting is incorrect.

Step 2: View whether IP addresses of the Ethernet interfaces of the host and router arewithin the same sub-net. That is the network addresses must be the same, only thehost addresses are different. If they are not in the same sub-net, please re-set the IPaddress.

Step 3: Check whether the link layer protocols match one another.

Take for example two link layer protocol standards supporting IP protocol, Ethernet_II

and Ethernet_SNAP: these two link layer protocols have different encapsulationformats and MTUs. MTU of the former has 1500 bytes and MTU of the latter has 1492

bytes. Two Ethernet devices can t communicate reliably unless they are connected withthe same link layer protocol. The Ethernet interface of Quidway series router cansimultaneously receive data frames with Ethernet_II and Ethernet_SNAP formats.

However, the format of sending data frame must be in accordance with eitherEthernet_II or Ethernet_SNAP specified by the user. Therefore, please confirm


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whether the data frame sending format of the router is the same as that of other hosts.When the protocols do not match, the cables and interfaces are physically normal, butcan t be pinged through.

Step 4: View whether the working mode of the Ethernet interface is correct.When connecting the Ethernet with unshielded twisted pair or fiber, there are two

working modes: full duplex and half duplex, specified in 10Base-T/100Base-TX/100Base-FX standard. When using HUB, the half-duplex working mode should be

selected. When using LAN Switch, if LAN Switch works in half duplex mode, theEthernet interface of the router also works in half duplex mode. If LAN Switch works infull duplex mode, the Ethernet interface of the router works in full duplex mode too. If

the working mode is incorrect, i.e. one party of the connection works in full duplex modewhile the other party in half duplex mode, fault will occur. That is, when network flowincreases, the party working in half duplex mode shows frequent network collisions (for

example, if HUB is connected, all the other devices on the whole network segment willshow serious network collisions), while the party working in full duplex mode showslarge amount of error messages received, accompanied with serious message losses

at both parties. In this case, use show interface ethernet command to view the errorratio of transceiving messages of the Ethernet interface. Usually, the collision can beobserved through the status indicator of the network interface.


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Chapter 3Configuring WAN Interface

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Chapter 3 Configuring WAN Interface

The wide area network (WAN) can be divided into X.25 network, frame relay network,

ATM network and ISDN network according to the line type. Accordingly, the router hassynchronous/asynchronous serial port, ATM interface, ISDN BRI and cE1/PRI.

Presently, VRP-supported WAN interfaces include asynchronous serial port, AUX

interface, synchronous serial port, ISDN BRI and cE1/PRI interfaces.

3.1 Asynchronous Serial Port

3.1.1 Asynchronous Serial Ports Overview

There are two asynchronous serial ports in VRP. One is Serial, which sets the

synchronous/asynchronous serial port to work in asynchronous mode. The other isAsync, a special asynchronous serial port.

You can set asynchronous serial port to dedicated line mode or dialup mode, and the

latter is in more common use. When the asynchronous serial port is connected with

Modem or ISDN terminal adapter (TA) externally, it can serve as a dialup interface,encapsulating link layer protocol SLIP or PPP, and supporting IP and IPX.

3.1.2 Configuring Asynchronous Serial Port

I. Configuration task list of asynchronous serial port

The configuration task of asynchronous serial port includes:

l Set the synchronous/asynchronous serial port to work in asynchronous mode.

l Enter the configuration mode of specified asynchronous serial portl Set the asynchronous serial port to work in dialup or dedicated line mode.l Set encapsulation format

l Set baud ratel Set link establishment mode.l Set the interactive check mode

l set stop bit in interactive model

Set data bit in interactive model Set flow control mode

l Enable or disable level detectionl Enable or disable internal loopback.l Set MTU

The asynchronous serial port may also need to be configured with SLIP parameter,

PPP parameter, DDR parameter, IP address, firewall and backup center parameter asrequired. Please see relevant chapters in this manual for details.


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II. Setting the synchronous/asynchronous serial port to work in asynchronousmode

If the physical interface to be configured is synchronous/asynchronous serial port, it

must be set to work in asynchronous mode by executing the following commands. Ifthis physical interface is a special asynchronous serial port, proceed to Step 3.

Please use the following command in the configuration mode ofsynchronous/asynchronous serial port

Table IC-3-1 Set the synchronous/asynchronous serial port to work in asynchronous mode

Operation Command

Set the synchronous/asynchronous serial port to work in asynchronous mode. physical-layer async

The synchronous/asynchronous serial port works in synchronous mode by default.

III. Entering the configuration mode of specified asynchronous serial port

Please use the following commands to enter the configuration mode of the specified

serial port in global configuration mode.

Table IC-3-2 Enter configuration mode of specified asynchronous interface

Operation Command

Enter the configuration mode of specified asynchronous serial port interface asyncnumber

Enter the configuration mode of the specified

synchronous/asynchronous serial port (which has been set to workin asynchronous mode)

interface serial number

IV. Setting the asynchronous serial port to work in dialup or dedicated linemode.

For special asynchronous serial port or the asynchronous serial port set from

synchronous/asynchronous serial port, it is possible to dialup with modem command.Please see DDR Configuration part in this manual for other settings and detailed

instructions in dialup mode. In dedicated line mode, ensure that modem command isnot configured, i.e. disable dial with no modem command.

Please use the following commands in the configuration mode of asynchronous serial

port.

Table IC-3-3 Set the working mode of asynchronous serial port

Operation Command

Set the asynchronous serial port to work in dial mode. modem {in | out}

Set the asynchronous serial port to work in dedicated line mode. no modem

The asynchronous serial port works in dial mode by default, i.e. modem command is

configured by default. Both calling in and calling out are allowed with modem in andmodem out command.


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V. Setting encapsulation format

The encapsulation format refers to the link layer frame format of the data passing by the

asynchronous serial port. It can be set as SLIP and PPP.

Please use the following command in the configuration mode of the asynchronous

serial port.

Table IC-3-4 Set the encapsulation format of asynchronous serial port

Operation Command

Set the encapsulation format of the asynchronous serial port encapsulation { slip | ppp }

The default encapsulation format is PPP.

VI. Setting baud rate

Please use following command in the configuration mode of the asynchronous serialport.

Table IC-3-5 Set the baud rate of asynchronous serial port

Operation Command

Set baud rate of the asynchronous serial port baudratebaudrate

Default value is 9600bit/s.

When the asynchronous serial port is used in dialup mode, the baud rate only refers to

the communication rate between the asynchronous serial port of the router and Modem.And the rate between two Modems must be determined according to the line qualityafter mutual consultation. Therefore, baud rate settings of asynchronous serial ports oftwo routers at two ends of the line can be inconsistent.

When the asynchronous serial port is used in dedicated line mode, the baud ratesetting must be consistent with the opposite equipment.

& Note:

After the synchronous/asynchronous serial port is set to work in asynchronous mode, the router willautomatically change the baud rate to 9600bit/s.

VII. Setting link establishment mode

There are three link establishment modes for the asynchronous serial port:

l Dedicated: after successful dialing, the local end directly uses the set link layer

protocol parameter to establish link with the opposite end. Dedicated mode isusually used when asynchronous serial ports are directly connected.

l Interactive: also called the flow mode, which means two ends of the link interact

with each other after successful dialing. The calling end sends configurationcommand to the receiving end (with the same effect as the user inputs

configuration command remotely), sets working parameters of the link layer


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protocol at the receiving end and then establishes the link. This mode is usuallyused for such man-machine interactions as dumb terminal and dialing, etc.

Please use the following commands in the configuration mode of the asynchronous

serial port.

Table IC-3-6 Set the link establishment mode of asynchronous serial port

Operation Command

Set the asynchronous serial port to establish the link in dedicated mode async mode dedicate

Set the asynchronous serial port to establish the link in interactive mode async mode interactive

Establish the link in dedicated mode by default.

VIII. Setting flow control mode

When the serial interface sets up a link in interactive mode, there are two flow controlmethods hardware flow control and software flow control.

In hardware flow control, data sending on the asynchronous serial port is controlled by

hardware signal. While sending data, the serial interface auto-detects the CTS signal. Itwill normally send the data when a CTS signal is detected. If no CTS signal is detected,it stops sending the data. In software flow control, data sending on the asynchronous

serial port is controlled by software signal. On receipt of the flow control characterXOFF (0x13), the async serial interface will shut down data sending on local interface;on receipt of the flow control character XON (0x11), it will start data sending of localinterface.

If the flow control method is set to normal, the asynchronous serial interface will only

start software flow control. If the flow control method is set to auto, the interface will

start hardware flow control and software flow control.

Please use the following command in the configuration mode of the asynchronous

serial port.

Table IC-3-7 Set the flow control mode of asynchronous serial port

Operation Command

Set the flow control mode of the asynchronous serial port. flowcontrol {normal | auto}

The default flow control mode is auto.

IX. Set the interactive check mode

When the link establishment mode of async serial port is interactive or Tty, the two ends

of the link will interact with each other after a successful dial. The calling end will sendconfiguration command to the receiving end and set the interactive parameters of linklayer protocol on the receiving end before the establishment of the link. In practical

application (such as terminal server), the router will send configuration command to theterminal and transmit interactive operating parameters of the link layer which are set atlocal end to the opposite end.

This command is used to set the interactive operating parameter of the link layer

protocol ---check mode.


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Please perform the following configuration in asynchronous serial interface

configuration mode.

Table IC-3-8 Set the check mode when the async serial port works in interactive mode

Operation Command

Set the check mode when the async serial port works ininteractive mode

parity { even | mark | none | odd | space }

By default, none is adopted for nonparity check.

X. set stop bit in interactive mode

This command is used to set another interactive operating parameter of the link layer

protocol---stop bit.

Please perform the following configuration in asynchronous serial interfaceconfiguration mode.

Table IC-3-9 Set the stop bit when the asynchronous serial port works in interactive mode

Operation Command

Set the stop bit when the asynchronous serial port works ininteractive mode

stopbits { 1 | 1.5 | 2

By default, there is only 1 stop bit.

XI. Set data bit in interactive mode

This command is used to set another interactive operating parameter of the link layer

protocol---data bit.

Please perform the following configuration in asynchronous serial interfaceconfiguration mode.

Table IC-3-10 Set the data bit when the asynchronous serial port works in interactive mode

Operation Command

Set the data bit when the asynchronous serial port works ininteractive mode

databits { 5 |6 | 7 |8 }

5, 6, 7 and 8 stand for 5, 6, 7 and 8 data bits respectively. By default, there are 8 data

bits.

IX. Enabling or disabing level detection

If the level detection is disabled for the asynchronous serial port, the system will only

detect whether the asynchronous serial port connects cables externally and

automatically report its state (UP or DOWN) to the user. If the level detection is enabled,the system will detect DSR signal in addition to the above-mentioned detection. Onlywhen this signal is effective will the system regard the asynchronous serial port as UP.Otherwise, DOWN.


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Please use the following commands in the configuration mode of the asynchronous

serial port.

Table IC-3-11 Enable or disable the level detection for the asynchronous serial port

Operation Command

Enable the level detection for the asynchronous serial port. detect dsr-dtr

Disable the level detection for the asynchronous serial port. no detect dsr-dtr

By default the level detection is enabled for the asynchronous serial port.

X. Enabling or disabling internal loopback.

On performing special function test, the internal loopback is enabled for the

asynchronous serial port.

Please use following commands in the configuration mode of the asynchronous serialport.

Table IC-3-12 Enable or disable internal loopback for the asynchronous serial port

Operation Command

Enable internal loopback for the asynchronous serial port. loopback

Disable internal loopback for the asynchronous serial port. no loopback

The internal loopback is disabled by default.

XI. Setting MTU

MTU of asynchronous serial port influences the fragmentation and reassembling of IP

network protocol message on this interface.

Please use the following commands in the configuration mode of the asynchronousserial port.

Table IC-3-13 Set MTU of asynchronous serial port

Operation Command

Set MTU of asynchronous serial port mtu mtuRecover MTU default no mtu

The unit of mtu is byte, ranging 128 to 1500, with 1500 as default.

The asynchronous serial port is used in dialup service or dedicated line service. For

details about its monitoring, maintenance, typical configuration example, fault

diagnosis and troubleshooting, please see related chapters of 03 WAN ProtocolConfiguration and 06 DDR Configuration in this manual.


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3.2 AUX Interface

3.2.1 Introduction to AUX Interface

AUX interface is a fixed port provided by Quidway router. It can be used as a common

asynchronous serial interface with the highest speed of 115200bps. With AUX interface,the functions like remote configuration of the router and line backup can beimplemented.

3.2.2 AUX Interface Configuration

I. Entering AUX interface configuration mode

Perform the following configuration in global configuration mode.

Table IC-3-14 Entering AUX interface configuration mode

Operation Command

Enter AUX interface configuration mode interf ace aux 0

II. AUX interface parameter configuration

AUX interface is configured in a similar way as that of the common asynchronous serialport. Notice that:

1) By default, AUX interface works in Interactive mode.2) When configuring the databits of AUX interface, the parameter of the databits

command cannot be set to 5, that is to say, AUX interface does not support the

databits to be 5.3) When configuring the stopbits of AUX interface, the parameter of the stopbits

command cannot be set to 1.5, that is to say, AUX interface does not support the

stopbits to be 1.5.4) On some Quidway routers of old type, AUX interface does not support the

checking of DSR signal. When using AUX interface, if the interface cannot check

whether the cable of the peer router has been properly connected, configure theno detect dsr-dtrcommand to disable the level checking of AUX. And then AUXwill stay UP.

In addition to the above points, AUX interface is configured in the same way as that of

the asynchronous serial interface. For other relevant configurations, refer toAsynchronous Serial Interface Configuration of this manual.

3.3 Synchronous Serial Port

3.3.1 Synchronous Serial Ports Overview

Features of synchronous serial port:

l It can work in two modes: DTE and DCE. Usually, the synchronous serial portserves as DTE and receives DCE-provided clock.


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l The synchronous serial port can connect multiple cables externally, such as V.24and V.35. VRP can automatically detect types of cables connected externally and

select electrical characters. There is no need to configure manually.l The link layer protocols supported by synchronous serial port include PPP, frame

relay, LAPB and X.25.l It supports IP and IPX network layer protocol.l Type of external cable and the working mode (DTE/DCE) of the synchronous

serial port can be viewed with show interface serial command.

value the voice output attenuation ranging 14.0 to 14.0 in dB with one digit after the

decimal point.

3.3.2 Configuring Synchronous Serial Port

I. Configuration task list of synchronous serial port

Configuration tasks of the synchronous serial port include:l Set the synchronous/asynchronous serial port to work in synchronous mode.l Enter the configuration mode of specified synchronous serial port.l Set encapsulation format

l Set line coding mode.l Set baud rate.l Select working clock

l Set clock inversionl Enable or disable internal loopback/external echol Enable or disable level detection

l Set MTU

PPP/X.25/FR parameters, DDR parameters, IP address, firewall parameters and

backup center parameters should be configured on the synchronous serial interface ifneeded. Refer to the relevant chapters in this manual for details.

II. Setting the synchronous/asynchronous serial port to work in synchronousmode.

Before further configuration, please set the synchronous/asynchronous serial port to

work in synchronous mode with the following command in the configuration mode ofsynchronous/asynchronous serial port.

Table IC-3-15 Set the synchronous/asynchronous serial port to work in synchronous mode

Operation Command

Set the synchronous/asynchronous serial port in synchronous mode. physical-layer sync

The synchronous/asynchronous serial port works in synchronous mode by default.

III. Entering the configuration mode of the specified synchronous serial port

In global configuration mode, enter the configuration mode of the specified

synchronous serial port with the following command.


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Table IC-3-16 Enter configuration mode of specified synchronous interface

Operation Command

Enter the configuration mode of the specified synchronous/asynchronous

serial port (which has been set to work in synchronous mode) interface serial number

IV. Setting encapsulation format

The encapsulation format refers to the link layer frame format of data passing by the

synchronous serial port. It can be set to have various encapsulation types.

Please use the following command in the configuration mode of the synchronous serial

port.

Table IC-3-17 Set the encapsulation format of synchronous serial port

Operation Command

Set encapsulation format encapsulation { frame-relay | hdlc | lapb | ppp | sdlc | x25 }

Select PPP encapsulation format by default.

V. Setting line code mode

There are two line-coding format: none-return-to-zero (NRZ and none-return-to-zero

inverted (NRZI).

Please specify NRZI as the line-coding mode with the following commands in the

configuration mode of synchronous serial port.

Table IC-3-18 Select NRZI as the line code mode

Operation Command

Select NRZI as the line coding mode. nrzi-encoding

Return to the default line-coding format no nrzi-encoding

Line coding format is NRZI by default.

VI. Setting baud rate

Please use the following command in the configuration mode of the synchronous serialport.

Table IC-3-19 Set the baud rate of synchronous serial port

Operation Command

Set baud rate of the synchronous serial port baudratebaudrate

The baud rates supported by the synchronous serial port are:

l 1200bit/s

l 4800bit/s

l 9600bit/s


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l 19200bit/sl 38400bit/s

l 64000bit/sl 72000bit/s

l 115200bit/sl 128000bit/sl 384000bit/sl 2048000bit/s

For different physical electrical procedure, the range of baud rate supported by the

synchronous serial port are different.

l V.24DTE/DCE: 1200bit/s-64000bit/sl V.35DCE/DCE, X.21DTE/DCE, EIA/TIA-449DTE/DCE and EIA-530DTE /DCE:

1200bit/s-2048000bit/s

When two synchronous serial ports are connected, the baud rate on line is determined

at DCE-side. Therefore, when the synchronous serial ports are working in DCE mode,the baud rate is to be set. However, if the ports act as DTE, then the baud rate needn t

be configured. Default baud rate of synchronous serial port is 64000bit/s.

& Note:

After the synchronous/asynchronous serial port is set to synchronous mode from asynchronous mode, thesystem will automatically change the default baud rate to 64000bit/s.

VII. Selecting working clock

The synchronous serial port works in two modes: DTE and DCE. Different workingmodes has different working clocks.

l If the synchronous serial port is used as DCE, it is necessary to provide clock tothe opposite DTE by choosing DCEclk.

l If the synchronous serial port is used as DTE, the clock provided by the oppositeDCE needs to be accepted. As the receiving clock and transmitting clock of thesynchronous equipment are independent, the receiving clock of DTE can be the

transmitting clock or receiving clock of DCE, or the sending clock of DTE can bethe transmitting clock or receiving clock of DCE. Thus, there will be fourcombinations, i.e. four kinds of clock selections are available at DTE side.

DCE DTE

TxClk

RxClk

Figure IC-3-1 Schematic diagram of synchronous serial port clock selection


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Table IC-3-20 Selection method with synchronous serial port serving as DTE-side clock

Selection method Meaning

DTE1 TxClk = TxClk, RxClk = RxClk

DTE2 TxClk = TxClk, RxClk = TxClk

DTE3 TxClk = RxClk, RxClk = TxClkDTE4 TxClk = RxClk, RxClk = RxClk

& Note:

TxClk stands for transmitting clock, RxClk for receiving clock, the clock before = is DTE-side clock, andthat behind = is DCE-side clock.

Please use the following commands in the configuration mode of the synchronous

serial port.

Table IC-3-21 Select working clock

Operation Command

Select DCE-side synchronous serial port clock clock-select DCEclk

Select DTE-side synchronous serial port clock. cloc k-select { DTE1 | DTE2 | DTE3 | DTE4}

The clock of DCE-side synchronous serial port is DCEclk by default, and that of DTEside is DTE3 by default.

VIII. Setting clock inversion

In some special cases, the clock will generate half-period delay on the line, which may

cause failed interconnection of equipment at two ends or large amount of messagesdiscarded. In this case, the receiving clock signal of DTE-side synchronous serial portcan be inverted to eliminate the influence of delay.

Please use the following commands in the configuration mode of the synchronousserial port.

Table IC-3-22 Set clock inversion

Operation Command

Enable the inversion of receiving clock signal of DTE-side synchronous serial port invert transmit-clock

Disable the inversion of receiving clock signal of DTE-side synchronous serial port no invert transmit-clock

The inversion is disabled by default.

& Note:

This command is only effective to certain clock signals provided by some DCEs. Usually, clock inversionshould not be set.


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IX. Enabling or disabling level detection

If level detection is disabled for the synchronous serial port, the system will only detect

whether the synchronous serial port connects cables externally and automatically

report its state (UP or DOWN) to the user. If level detection is enabled, the system willfurther detect DSR and DCD signals. Only when these two signals are effective will thesystem regard the synchronous serial port as UP.


serial port.

Table IC-3-23 Enable or disable level detection for the synchronous serial port

Operation Command

Enable level detection for the synchronous serial port. detect dsr-dtr

Disable level detection for the synchronous serial port. no detect ds r-dtr

Level detection is enabled for the synchronous serial port by default.

X. Enable or disable internal loopback/external echo

To perform special function test, the internal loopback/external echo is enabled for the

synchronous serial port.

Please use the following commands in the configuration mode of the synchronousserial port.

Table IC-3-24 Enable/disable internal loopback/external echo for the synchronous serial port

Operation Command

Enable the internal loopback/external echo for the synchronous serial port. loopback

Disable the internal loopback/external echo for the synchronous serial port. no loopback

The internal loopback/external echo is disabled by default.

XI. Configuring MTU

MTU of synchronous serial port affects the fragmentation and reassembling of IPnetwork protocol message on this interface.


serial port.

Table IC-3-25 Set MTU of synchronous serial port

Operation Command

Set MTU of synchronous serial port mtu mtu

Recover the default value of MTU no mtu

The unit of mtu is byte, ranging between 128-1500, with 1500 as default.

The synchronous serial port is mainly used in dialup service. For details about its

monitoring and maintenance, typical configuration example, fault diagnosis and

troubleshooting, please see DDR Configuration part in this manual.


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3.4 ISDN BRI Interface

3.4.1 ISDN BRI Interface Overview

I. Technical background

Integrated services digital network (ISDN) is a new technology developed since 1970 s.

It can provide all-digital services from terminal user to terminal user, and fulfill an all-digital transmission mode integrating such services as voice, data, graphics and video.

ISDN is different from conventional PSTN. In conventional PSTN, information is sent to

the switch via analog user loop, converted to digital signal through A/D conversion, andthen resumed to analog signal when reaching the destination user. ISDN realizes the

digital transmission of user loop, implements digital end-to-end communication, andenables various digital and analog information to transmit via the standard digital

interface. Besides, ITU-T standardizes ISDN services and formulates such protocolsas I.430, Q.921 and Q.931 to make any equipment complying with relevant ISDNstandard of ITU-T able to access ISDN easily.

User-network interface specification of ISDN:

In ITU-T I.411 recommendations, reference configuration of ISDN user-network

interface is given according to concepts of function group (a group of functions required

by users to access ISDN) and reference point (a point used to distinguish functiongroups), as shown in the following diagram.

TE2 TA

TE1

2345

NT2 NT1

1

Figure IC-3-2 Reference configuration of ISDN user-network interface

The function group includes:

l Network terminal 1 (NT1): it mainly fulfills functions of OSI layer 1, includingsubscriber line transmission function, loop test and D channel contention.

l Network terminal 2 (NT2): also called intelligent network terminal, including layer

1-layer 3 of OSI.l Type-1 terminal equipment (TE1): also called ISDN standard terminal, which is

user equipment conforming to ISDN interface standard (such as digital phone set).

l Type-2 terminal equipment (TE2): also called non-ISDN standard terminal, whichis user equipment not conforming to ISDN interface standard.


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l Terminal adapter (TA): it implements adaptation function, making TE2 to accessISDN standard interface.

The reference point includes:

l

R reference point: it is between non-ISDN equipment and TAl S reference point: it is between user terminal and NT2.l T reference point: it is between NT1 and NT2.

l U reference point: it is between NT1 and line terminal.

II. Preparations before configuration

Be clear about the following items before the configuration:

l Whether the interface provided by telecom service provider is ISDN BRI U

interface or ISDN BRI S/T interface: In ITU-T I.411 recommendation, the referencemodel of ISDN user-network interface is given. However, there is worldwidedispute about the position of division point between the user and network. And U

interface or S/T interface is used according to different nations. In this case, before

purchasing the router, the user must ensure whether the interface provided by thetelecom server is ISDN BRI U interface or ISDN BRI S/T interface.

l Whether digital service is provided: ISDN can provide integrated services likedigital service or voice service. Since the router is to perform digitalcommunication, the ISDN line that the user applies for must support digital calling

service. Otherwise, data communication can t be realized.l Whether to select Point-to-Point connection or Point-to-Multipoint connection

(optional): ISDN supports semi-permanent connection function. If the user only

uses ISDN to connect fixed points, ISDN dedicated line can be used. Otherwise,Point-to-Multipoint connection is required.

l Caller Identification function (optional): On ISDN with CID function, the caller

number can be filtered, so that only a group of user lines can dial in this router,enhancing the security of the network.

3.4.2 Configuring ISDN BRI Interface

Please enter the configuration mode of the specified ISDN BRI interface with the

following command in global configuration mode.

Table IC-3-26 Enter the configuration mode of the specified ISDN BRI interface

Operation Command

Enter the configuration mode of the specified ISDN BRI interface interface bri interface-number

Please dial before using ISDN BRI interface. See 06 DDR Configuration part in thismanual for detailed description of configuration, monitoring and maintenance, typicalconfiguration example, fault diagnosis and troubleshooting of ISDN BRI interface.

3.5 cE1/PRI Interface

3.5.1 cE1/PRI Overview

cE1/PRI interface works in two modes E1 working mode and cE1/PRI working mode.

In E1 mode, it works like an interface without timeslot whose data bandwidth is 2Mbit/s.

It has the same logic features as the synchronous serial port, supports such link layer


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protocols as PPP, frame relay, LAPB and X.25 and such network protocols as IP andIPX.

In cE1/PRI mode, it is physically divided into 32 timeslots, respectively corresponding

to numbers 0-31. This interface is used in two ways:

l When used as cE1 interface, it can divide all timeslots into random groups. Each

group of timeslots, whose logic features are the same as those of synchronousserial port, is bound to serve as a channel-group interface, supporting such linklayer protocols as PPP, frame relay, LAPB and X.25, and network protocols such

as IP and IPX.l When used as PRI interface, since the timeslot numbered 16 is used as D channel

for signaling transmission, it can only select a group of timeslots out of those

timeslots except timeslot 16, and bind this group to serve as a pri-group interface.Its logic features are the same as those of ISDN dialing interface that supportsPPP link layer protocol and such network protocols as IP and IPX. In addition,

parameters link DDR can also be configured.

3.5.2 Configuring cE1/PRI Interface

I. Configuration task list of cE1/PRI Interface

The configuration tasks of cE1/PRI interface include:

l Enter the configuration mode of the specified cE1/PRIl Set line CODEC formatl Set line clock

l Enable or disable internal loopback.l Switch-over of E1 and cE1/PRIl Set frame check mode

l Set timeslot binding mode of cE1/PRI interfacel Set working parameters of channel-groupl Set working parameters of pri-group

l Set working parameters of E1

II. Entering the configuration mode of the specified cE1/PRI interface

Enter the configuration mode of the specified cE1/PRI interface with the followingcommand in global configuration mode.

Table IC-3-27 Enter the configuration mode of the specified cE1/PRI interface

Operation Command

Enter the configuration mode of the specified cE1/PRI interface controller e1 number

III. Setting line CODEC format

cE1/PRI interface supports two line CODEC formats:

AMI format

HDB3 format

Please use the following commands in the configuration mode of cE1/PRI interface.


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Table IC-3-28 Set the line CODEC format for cE1/PRI interface

Operation Command

Set the line CODEC format of cE1/PRI interface linecode { ami | hdb3 }

Restore the default line CODEC format of cE1/PRI interface no linecode

The default is HDB3 format.

IV. Setting line clock

When cE1/PRI is used as synchronous interface, there are also two working modes:

DTE and DCE, and it is also necessary to select line clock. When cE1/PRIs of two

routers are connected directly, two ends must work in DTE and DCE modesrespectively. When cE1/PRI of the router is connected with the switch, the switch worksas DCE, and cE1/PRI of the router should then work in DTE mode. Used as a

synchronous interface, cE1/PRI works in DTE mode by default.

Please use following commands in configuration mode of cE1/PRI.

Table IC-3-29 Set the line clock of cE1/PRI interface

Operation Command

Set the line clock of cE1/PRI interface clock { dc e | line }

Restore the default line clock of cE1/PRI interface no clock

By default, Select DTE clock, i.e., the line clock, on cE1/PRI interface.

V. Enabling or disabling internal loopback.


Table IC-3-30 Enable or disable internal loopback of cE1/PRI interface

Operation Command

Enable loopback of cE1/PRI interface loopback

Disable loopback of cE1/PRI interface no loopback

The internal loopback is disabled by default.

VI. Switching-over of working modes of E1 and cE1/PRI

cE1/PRI interface works in two modes: E1 and cE1/PRI.


Table IC-3-31 Set the working modes of cE1/PRI interface

Operation Command

Set cE1/PRI interface to work in E1 mode using e1

Set cE1/PRI interface to work in cE1/PEI mode using ce1

The default is cE1/PRI working mode.


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Here, interface-numberstands for the number of Serial interface added in the system

when channel-group is set for cE1/PRI interface, and channel-group-numberis the setchannel group number.

The main setting includes:l Working parameters of such link layer protocols as PPP, frame relay, LAPB or

X.25.l IP addressl If the interface serves as main interface or backup interface of the backup center,

it is necessary to set working parameters of the backup center.l To build up firewall on this interface, it is required to set address translation and

bit/s filtering rules.

Please see related parts in this manual for detailed information.

X. Setting working parameters of pri-group

pri-group can be used as an ISDN dialup interface.

Please use the following command to enter the corresponding configuration mode in

cE1/PRI configuration mode.

Table IC-3-35 Enter the configuration mode of ISDN interface

Operation Command

Enter configuration mode of ISDN interface interface serial interface-number:15

Here, interface-numberstands for the number of Serial interface added in the system

when pri-group is set for cE1/PRI interface.

The main setting includes:

l DDR working parametersl Encapsulation link protocol PPP and its authentication parameters

l IP addressl If the interface serves as the main interface or backup interface of the backup

center, it is necessary to configure working parameters of the backup center.

l To build up firewall on this interface, it is required to configure the firewall

Please see related parts in this manual for detailed information.

XI. Setting working parameters of E1

E1 can be used as a synchronous serial port.

Please use the following command to enter the corresponding configuration modes in

cE1/PRI configuration mode (which has been set to E1 mode).

Table IC-3-36 Enter the configuration mode of the synchronous serial port

Operation Command

Enter the configuration mode of the synchronous serial port interface serial interface-number:0

Here, interface-numberstands for the number of Serial interface added in the systemwhen pri-group is set for cE1/PRI interface.

The main setting includes:


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l Working parameters of such link layer protocols as PPP, frame relay, LAPB orX.25.

l IP addressl If the interface serves as main interface or backup interface of the backup center,

it is necessary to configure working parameters of the backup center.l To build up firewall on this interface, it is required to configure address translation

and bit/s filtering rules.

Please see relevant parts in this manual for detailed information.

3.5.3 Monitoring and Maintenance of cE1/PRI Interface

Please use the following commands to display the state and relevant information of

cE1/PRI interface in privileged user mode, so as to monitor and maintain cE1/PRIinterface

Table IC-3-37 Monitor and maintenance cE1/PRI interface

Operation Command

Show the working state of cE1/PRI interface show controll er e1 interface-number

Show the working state of channel-group or pri-group show in terface serialinterface-number:number

Example 1:

! Show the working state of cE1/PRI interface

Quidway#show controller e1 1


E1 1-1 is down.Applique type is E1 - 75 OHM unbalancedFraming is NO-CRC4, Line Code is HDB3, Source Clock is Line.

The information displayed above includes the physical state, application mode, frame

check mode, line CODEC format, and line clock selection.

Example 2:

! Show working state of pri-group

Quidway#show interface serial 9:15


Serial9:15 is down, line protocol is downphysical layer is E1, baudrate is 1920000 bps

Encapsulation is PPP5 minutes input rate 0.00 bytes/sec, 0.00 packets/sec5 minutes output rate 0.00 bytes/sec, 0.00 packets/secInput queue :(size/max/drops)0/50/0Queueing strategy: FIFOOutput Queue :(size/max/drops)0/50/00 packets input, 0 bytes, 0 no buffers0 packets output, 0 bytes, 0 no buffers0 input errors, 0 CRC, 0 frame errors0 overrunners, 0 aborted sequences, 0 input no buffers

Timeslot(s) Used: 1-31


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The information displayed above includes the physical state, line state, frame

encapsulation format, application mode and statistic information of transceivingmessage of pri-group.

cE1/PRI interface is usually used in dialup service or dedicated line service. For its

typical configuration example, fault diagnosis and troubleshooting, please see relatedchapters of 03 Link Layer Configuration and 10 DDR Configuration in this manual.


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Chapter 4Configuring Logic Interface

4-1

Chapter 4 Configuring Logic Interface

As described above, the logic interface refers to the interface that can exchange data,

but does not exist physically and needs to be established through configuration,including the Dialer interface, sub-interface, backup center logic channel and virtual-template.

4.1 Dialer Interface

4.1.1 Dialer Interface Overview

Dialer interface is a dialup interface. Dial-supporting interfaces on Quidway seriesrouter include synchronous serial port, asynchronous serial port, ISDN BRI interfaceand ISDN PRI interface. VRP realizes the Dial on Demand Routing (DDR) function, andprovides two DDR configuration methods: standard DDR and flexible DDR. Please see

"DDR Configuration part in this manual for detailed information about concepts ofstandard DDR and flexible DDR.

4.1.2 Configuring Dialer Interface

According to different DDR modes, configurations of Dialer interface are:

l Configure Dialer interface for standard DDRl

Configure Dialer interface for flexible DDRPlease see related chapters in 06 DDR Configuration part in this manual for detailed

description, monitoring and maintenance, typical configuration example, fault diagnosisand troubleshooting of the configurations of standard and flexible DDR.

4.2 Sub-Interface

4.2.1 Sub-Interface Overview

VRP provides the concept of sub-interface, which enables user to configure multiple

sub-interfaces on single physical interface of Quidway series router.Sub-interface implements multiple logic interfaces on a physical interface, i.e. to

associate multiple logic interfaces with one physical interface. The logic interfaces thatbelong to the same physical interface will share physical configuration parametersduring work, and they also have independent link layer and network layer configurationparameters.

In Quidway series router, the physical interfaces supporting sub-interface featuresinclude:

l Ethernet interface: when the sub-interface of Ethernet has not been configuredwith VLAN id, it can only support IPX network protocol. After configured with VLANid, it will be able to support both IPX and IP protocols.

l WAN interface of encapsulation frame relay: its sub-interface can support IP andIPX network protocols.


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l WAN interface of encapsulation X.25: its sub-interface can support IP and IPXnetwork protocols.

4.2.2 Configuring Sub-Interface

I. Configuration task list of sub-interface

According to different physical interfaces, the configuration tasks of sub-interfacesinclude:

l Configure sub-interfaces of Ethernet interfacel Configure sub-interfaces of WAN interface of encapsulation frame relayl Configure sub-interfaces of WAN interface of encapsulation X.25

II. Configuring sub-interfaces of Ethernet interface

1) Create and delete Ethernet sub-interfaces

Please use the following commands in global configuration mode.

Table IC-4-1 Create and delete Ethernet interface

Operation Command

Create Ethernet sub-interface and enter its configuration moderinterf ace ethernet interface-number.subinterface-number

Delete the specified Ethernet sub-interfaceno i nterface ethernet interface-number.subinterface-number

When using the above commands, if corresponding Ethernet sub-interface has been

created (the same as subinterface-number), enter the configuration mode of this sub-

interface directly. Otherwise, first create Ethernet sub-interface with subinterface-number as the specified one, and then enter the configuration mode of this sub-interface.

2) Configure relevant working parameters

If the sub-interface of Ethernet has not been configured with VLAN id, it can only

support IPX network protocol. Therefore, only IPX network address and other IPXworking parameters can be configured on this sub-interface. The detailed configurationprocedure and method are similar to those of the Ethernet interface. Please see LAN

interface configuration in Interface Configuration and IPX configuration in NetworkProtocol Configuration of this manual.

After configured with VLAN id, the sub-interface of Ethernet can support IP and IPX.

For relevant configuration, refer to LAN interface configuration in InterfaceConfiguration and IP configuration in Network Protocol Configuration of this manual.

III. Configuring sub-interfaces of WAN interface of encapsulation frame relay

1) Create and delete WAN sub-interfaces

Please use the following commands in global configuration mode.


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Table IC-4-2 Create and delete WAN sub-interface

Operation Command

Create WAN sub-interface and enter its

configuration mode

interface { serial | async } interface-number.subinterface-number

[multipoint |point-to-point ]

Delete specified WAN sub-interfaceno interface { serial | async } interface-number.subinterface-number[ multipoint | point-to-point ]

When using the above commands, if corresponding WAN sub-interface has been

created (the same as subinterface-number), enter the configuration mode of this sub-

interface directly. Otherwise, first create WAN sub-interface with subinterface-numberas the specified one, and then enter the configuration mode of this sub-interface.


The following items can be configured on the sub-interface of WAN interface of

encapsulation frame relay:

l Frame relay address mapping different from the affiliated WAN interface (i.e. the

main interface)l IP address which is not in the same network segment as the affiliated WAN

interface

l IPX network number different from that of the affiliated WAN interface, and otherIPX working parameters

l Virtual circuit of the sub-interface

Please see chapters in WAN Protocol Configuration and Network Protocol

Configuration in this manual for details about the above configurations.

IV. Configuring sub-interfaces of WAN interface of encapsulation X.25

1) Create and delete WAN sub-interfacesThe command is the same as above.


The following items can be configured on the sub-interface of WAN interface of

encapsulation X.25:

l X.25 address mapping different from the affiliated WAN interface (i.e. the main

interface)l IP address which is not in the same network segment as the affiliated WAN

interface

l IPX network number different from that of the affiliated WAN interface, and otherIPX working parameters

l Virtual circuit of the sub-interface

Please see chapters in WAN Protocol Configuration and Network Protocol

Configuration in this manual for details about the above configurations, and sub-interface monitoring and maintenance. No further details are provided here.

V. Typical WAN sub-interface configuration example

1) Networking requirements

As shown below, WAN interface Serial0 of router A is connected with router B and

router C via public frame relay network. By configuring sub-interfaces on Serial0 ofrouter A, LAN 1 can simultaneously access LAN 2 and LAN 3 via Serial0.

2) Networking diagram


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Router A

Router B

Router C

Frame relay

Ethernet1 Serial0

DLCI=50

202.38.160.1

202.38.161.2

129.9.0.0 Ethernet 3

Ethernet 2

DLCI=60

DLCI=70

DLCI=80

202.38.160.2

202.38.161.1

129.10.0.0

129.11.0.0

Figure IC-4-1 Networking diagram of WAN sub-interface configuration example

3) Configuration procedure

! Enter the configuration mode of WAN interface Serial0 of router A

Quidway(config)#interface serial 0

! Select frame relay encapsulation format

Quidway(config-if-Serial0)#encapsulation frame-relay

! Specify DTE as its frame relay terminal type

Quidway(config-if-Serial0)#frame-relay intf-type dte

! Create sub-interface Serial 0.1 on WAN interface Serial0 of router A in point-to pointmode, and enter its configuration mode

Quidway(config)#interface serial 0.1 point-to-point

! Set its IP address to 202.38.160.1 and address mask to 255.255.255.0.

Quidway(config-if-Serial0.1)#ip address 202.38.160.1 255.255.255.0

! Allocate a virtual circuit with DLCI 50 to it.

Quidway(config-if-Serial0.1)#frame-relay interface-dlci 50

! Create sub-interface Serial 0.2 on WAN interface Serial0 of router A in point-to point

mode, and enter its configuration mode

Quidway(config)#interface serial 0.2 point-to-point

! Set its IP address to 202.38,161.1 and address mask to 255.255.255.0.

Quidway(config-if-Serial0.2)#ip address 202.38.161.1 255.255.255.0

! Allocate a virtual circuit with DLCI 60 to it.

Quidway(config-if-Serial0.2)#frame-relay interface-dlci 60

! Configure the static route from router A to LAN2 and LAN3.

Quidway(config)#ip route 129.10.0.0 255.255.0.0 202.38.160.2

Quidway(config)#ip route 129.11.0.0 255.255.0.0 202.38.161.2

Configurations of router B and router C are omitted here. For fault diagnosis and

troubleshooting of sub-interface, please see chapters in 03-Link Layer ProtocolConfiguration and 04-Network Protocol Configuration in this manual.


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4.3 Backup Center Logic Channel

4.3.1 Backup Center Logic Channel Overview

The backup center not only provides mutual backup between respective interfaces, but

also chooses a certain virtual circuit belonging to X.25 or frame relay as the maininterface or backup interface of the backup center. Please see relevant chapters fordetails about the backup center.

To facilitate configuration, the user can specify relevant logic channel for the above-

mentioned virtual circuit and configure working parameters of the backup center in thelogic channel.

4.3.2 Configuring Backup Center Logic Channel

For detailed description, monitoring and maintenance, typical configuration example,

fault diagnosis and troubleshooting oriented to the configurations of the backup centerlogic channel, please see Configuration of Backup Center in ReliabilityConfiguration in this manual.

4.4 Virtual-Template and Virtual Interface

4.4.1 Virtual-Template and Virtual Interface Overview

Virtual-template, just as the name implies, is a template used to configure a virtual

interface, mainly used in VPN and MP.

After setting up the connection of VPN session, it is necessary to create a virtual

interface to exchange data with the opposite end. At this time, the system will choose avirtual-template according to the user s configuration, and dynamically create a virtualinterface based on the configuration parameters of the template. Please see relatedchapters in 08-VPN Configuration in this manual for the configuration of VPN.

Similarly, after multiple PPP links are bound as MP, a virtual interface also needs to be

created to exchange data with the opposite end. At this time, select an interfacetemplate to dynamically create a virtual interface.

4.4.2 Configuring Virtual-Template

I. Configuration task list of virtual-interface

In VPN and MP application environments, the system automatically creates and

deletes virtual inter

02ic(interface configuration command)

Documents