arquitectura de redes qos 16

8/13/2019 Arquitectura de Redes QoS 16

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AutoQoS

Introducing Cisco AutoQoS VoIP

Introducing Cisco AutoQoS Enterprise


AutoQoS VoIP

One command per interface to enable and configure QoS


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AutoQoS VoIP (Cont.)

interface Multilink1

ip address 10.1.61.1 255.255.255.0

ip tcp header-compression iphc-format

load-interval 30service-policy output QoS-Policy

ppp multilink

ppp multilink fragment-delay 10

ppp multilink interleave

multilink-group 1

ip rtp header-compression iphc-format

!

interface Serial0

bandwidth 256

no ip address

encapsulation ppp

no ip mroute-cache

load-interval 30

no fair-queue

ppp multilink

multilink-group 1

interface Serial0

bandwidth 256

ip address 10.1.61.1 255.255.255.0

auto qos voip

AutoQoS

Manual QoS

AutoQoS (Cont.)

Application Classification

Automatically discovers applications

and provides appropriate QoS treatment

Policy Generation

Automatically generates initial andongoing QoS policies

Configuration

Provides high-level business

knobs, and multi-device/domain

automation for QoS

Monitoring & Reporting

Generates intelligent, automatic

alerts and summary reports

Consistency

Enables automatic, seamless

interoperability among all QoS features

and parameters across a network

topology LAN, MAN, and WAN

AutoQoS VoIP: Router Platforms

Cisco 1760, 1800, 2600, 2800, 3600, 3700, 3800, and 7200

series routers You can meet the voice QoS requirements without extensive

knowledge about:

Underlying technologies (for example: PPP, FR, ATM)

Service policies

Link efficiency mechanisms

AutoQoS lends itself to tuning of all generated parameters &

configurations


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AutoQoS VoIP: Switch Platforms

Cisco Catalyst 2950, 2960, 2970, 3550, 3560, 3750, 4500, and

6500 series switches

You can meet the voice QoS requirements without extensive

knowledge about:

Trust boundary

CoS-to-DSCP mappings

WRR & PQ scheduling parameters

Generated parameters and configurations are user-tunable

AutoQoS VoIP: Switch Platforms (Cont.)

Single command at the interface level configures interface and

global QoS

Support for Cisco IP Phone & Cisco SoftPhone

Support for Cisco SoftPhone currently exists only on the

Catalyst 6500

Trust boundary is disabled when IP Phone is moved

Buffer allocation and egress queuing dependent on interface

type (Gigabit Ethernet/Fast Ethernet)

Supported on static, dynamic-access, voice VLAN access, and

trunk ports

CDP must be enabled for AutoQoS to function properly

Configuring AutoQoS VoIP:

Prerequisites for Using AutoQoS VoIP

CEF must be enabled at the interface or ATM PVC.

This feature cannot be configured if a QoS policy(service policy) is attached to the interface.

An interface is classified as low-speed if its bandwidth is less

than or equal to 768 kbps. It is classified as high-speed if its

bandwidth is greater than 768 kbps.

The correct bandwidth should be configured on all

interfaces or subinterfaces using the bandwidth command.

If the interface or subinterface has a link speed of 768 kbps

or lower, an ip address must be configured using the ip

address command.


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Routers

auto qos voip [trust] [fr-atm]

router(config-if)# or router(config-fr-dlci)#

Configures the AutoQoS VoIP feature. Untrusted mode by default.

trust: Indicates that the DSCP markings of a packet aretrusted (relied on) for classification of the voice traffic.

fr-atm: For low-speed Frame Relay DLCIs interconnectedwith ATM PVCs in the same network, the fr-atmkeywordmust be explicitly configured in the auto qos voipcommand to configure the AutoQoS VoIP featureproperly.


Cisco Catalyst 6500 Switch

Console>(enable) set qos autoqosQoS is enabled.........

All ingress and egress QoS scheduling parameters configured on all

ports.CoS to DSCP, DSCP to COS, IP Precedence to DSCP and policeddscp maps configured.Global QoS configured, port specific autoqos recommended:set port qos autoqos trust set port qos autoqos voip

set qos autoqos

Console> (enable)

Global configuration command.

All the global QoS settings are applied to all ports in the

switch.

Prompt displays the CLI for the port-based automatic QoS

commands currently supported.


Cisco Catalyst 6500 Switch (Cont.)

set port qos autoqos trust [cos|dscp]

Console> (enable)

trust dscpand trust cosare automatic QoS keywords usedfor ports requiring a trust all type of solution.

trust dscpshould be used only on ports that connect toother switches or known servers, because the port will betrusting all inbound traffic marking Layer 3 (DSCP).

trust cosshould only be used on ports connecting otherswitches or known servers, because the port trusts allinbound traffic marking in Layer 2 (CoS).

The trusted boundary feature is disabled and no QoSpolicing is configured on these types of ports.


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Cisco Catalyst 6500 Switch (Cont.)

set port qos autoqos voip [ciscosoftphone

| ciscoipphone]

Console> (enable)

ciscosoftphone

The trusted boundary feature must be disabled for Cisco

SoftPhone ports.

QoS settings must be configured to trust the Layer 3 markings ofthe traffic that enters the port.

Available on most Catalyst platforms.

ciscoipphone

The port is set up to trust-cos as well as to enable the trusted

boundary feature.

Combined with the global automatic QoS command, all settingsare configured on the switch to properly handle the signaling and

voice bearer and PC data entering and leaving the port.

CDP must be enabled for the ciscoipphone QoS configuration.


Catalyst 2950 (EI), 3550 Switches

auto qos voip trust

Switch(config-if)#

The uplink interface is connected to a trusted switch or router,and the VoIP classification in the ingress packet is trusted.

auto qos voip cisco-phone

Switch(config-if)#

Automatically enables the trusted boundary feature, which usesthe CDP to detect the presence or absence of a Cisco IP Phone.

If the interface is connected to a Cisco IP Phone, the QoS labelsof incoming packets are trusted only when the IP Phone isdetected.

Monitoring AutoQoS VoIP:

Routers

show auto qos [interface interface type]

router>

router>show auto qos interface Serial6/0

Serial6/0 !interface Serial6/0service-policy output AutoQoS-Policy-UnTrust

Displays the interface configurations, policy maps, class maps,and ACLs created on the basis of automatically generatedconfigurations


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Routers (Cont.)

router>show policy-map interface FastEthernet0/0.1FastEthernet0/0.1Service-policy output: voice_trafficClass-map: dscp46 (match-any)0 packets, 0 bytes5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp 460 packets, 0 bytes5 minute rate 0 bpsTraffic ShapingTarget Byte Sustain Excess Interval Increment AdaptRate Limit bits/int bits/int (ms) (bytes) Active

2500 10000 10000 333 1250 -rest deleted

show policy-map interface [interface type]

router>

Displays the packet statistics of all classes that are configured forall service policies, on either the specified interface or subinterface


Switches

show auto qos [interface interface-id]

Switch#

Switch#show auto qosInitial configuration applied by AutoQoS:

wrr-queue bandwidth 20 1 80 0no wrr-queue cos-map

wrr-queue cos 1 0 1 2 4wrr-queue cos 3 3 6 7wrr-queue cos 4 5mls qos map cos-dscp 0 8 16 26 32 46 48 56!interface FastEthernet0/3

mls qos trust device cisco-phonemls qos trust cos

Displays the AutoQoS configuration that was initially applied

Does not display any user changes to the configuration thatmight be in effect


Switches (Cont.)

Switch#show mls qos interface gigabitethernet0/1 statistics

Ingress

dscp: incoming no_change classified policed dropped (in bytes)

1 : 0 0 0 0 0

Others: 203216935 24234242 178982693 0 0

Egress

dscp: incoming no_change classified policed dropped (in bytes)

1 : 0 n/a n/a 0 0

WRED drop counts:

qid thresh1 thresh2 FreeQ

1 : 0 0 1024

2 : 0 0 1024

rest deleted

show mls qos interface [interface-id| vlan vlan-id][buffers | policers | queueing | statistics][ | {begin | exclude | include} expression]

Switch#

Displays QoS information at the interface level


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Switches (Cont.)

show mls qos maps [cos-dscp | dscp-cos | dscp-

mutation dscp-mutation-name| dscp-switch-priority |

ip-prec-dscp | policed-dscp] [ | {begin | exclude |include} expression

Switch#

Switch#show mls qos maps dscp-cos

Dscp-cos map:dscp: 0 8 10 16 18 24 26 32 34 40 46 48 56

-----------------------------------------------cos: 0 1 1 2 2 3 7 4 4 5 5 6 7

Maps are used to generate an internal DSCP value, whichrepresents the priority of the traffic.

Automation with Cisco AutoQoS (Routers):

DiffServ Functions Automated



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AutoQoS Enterprise

Frame Relay

Two commands entered on the

WAN interface

AutoQoS Enterprise:

Medium to large campuswith large remote sites

Best practices WAN QoS policy

automation tool

Classification for up to 10 traffic

classes

+ 120 Remote Sites

Multiple Apps. Multiple Apps.

AutoQoS

Enterprise

Multiple Apps.

auto discovery qosauto qos

AutoQoS Enterprise (Cont.)

AutoDiscovery Cisco AutoQoS Policy

Application and

Protocol Types

Cisco AutoQoSClass Maps

Match Statements

Offered BitRate (Averageand Peak)

Minimum Bandwidthto Class Queues,Scheduling, andWRED

Traffic Class

Transactional/Interactive AF21

Telephony Signaling CS3

Streaming Video CS4

Interactive Video AF41

Interactive Voice EF

Network Management CS2

Bulk Data AF11

Scavenger CS1

Best Effort 0

IP Routing CS6

DSCP

class-map match-any AutoQoS-Voice-Se3/1

match protocol rtp audioclass-map match-any AutoQoS-Inter-Video-Se3/1match protocol rtp videoclass-map match-any AutoQoS-Signaling-Se3/1match protocol sipmatch protocol rtcpclass-map match-any AutoQoS-Transactional-Se3/1match protocol citrixclass-map match-any AutoQoS-Bulk-Se3/1match protocol exchange!

policy-map AutoQoS-Policy-Se3/1class AutoQoS-Voice-Se3/1priority percent 30set dscp ef


AutoQoS Enterprise

class AutoQoS-Inter-Video-Se3/1

bandwidth remaining percent 1set dscp af41

class AutoQoS-Signaling-Se3/1bandwidth remaining percent 5set dscp cs3

class AutoQoS-Transactional-Se3/1bandwidth remaining percent 3random-detect dscp-basedset dscp af21

class AutoQoS-Bulk-Se3/1bandwidth remaining percent 1random-detect dscp-basedset dscp af11

class class-defaultfair-queue


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!class-map match-any AutoQoS-VoIP-RTP-Trust

match ip dscp efclass-map match-any AutoQoS-VoIP-Control-Trustmatch ip dscp cs3

match ip dscp af31!policy-map AutoQoS-Policy-Trustclass AutoQoS-VoIP-RTP-Trustpriority percent 70

class AutoQoS-VoIP-Control-Trust

bandwidth percent 5class class-defaultfair-queue!

AutoQoS VoIP

AutoQoS Enterprise: Router Platforms

AutoQoS Enterprise supported platforms:

Cisco 1760

Cisco 1800

Cisco 2600, including XM series

Cisco 2800 Integrated Services Router

Cisco 3600

Cisco 3725 and 3745

Cisco 3800 Integrated Services Routers

Cisco 7200 series routers

AutoQoS Enterprise: Router Platforms (Cont.)

Search Cisco IOS Software by FEATURE:

Cisco IOS Software features:


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Configuring AutoQoS Enterprise

Before configuring AutoQoS Enterprise, remove any existing

service policies on an interface.

AutoQoS Enterprise requires cefto be enabled at the interface

level

The correct bandwidth must be configured on all interfaces or

subinterfaces using the bandwidth command.

If the interface or subinterface has a link speed of 768 kbps or

lower, an ip address must be configured using the ip address

command.

Configuring AutoQoS Enterprise (Cont.)

auto qos


This command will not work until statistics have been gathered fromphase one.

Configures the second phase for AutoQoS Enterprise. Instructs the templates to generate QoS policy based on statistics

gathered using NBAR and installs the service policies in the WANinterface where the command is entered.

auto discovery qos [trust]


Configures phase one of the auto-discovery phase

Traffic statistics are gathered by NBAR

Monitoring AutoQoS Enterprise

show auto qos [interface interface type]

router>

router>show auto qos interface Serial2/1

Serial2/1 !interface Serial2/1.1service-policy output AutoQoS-Policy-Trust

Displays the interface configurations, policy maps, class maps,and ACLs created on the basis of automatically generatedconfigurations


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Router#show auto discovery qos

AutoQoS Discovery enabled for applications

Discovery up time: 2 days, 55 minutes

AutoQoS Class information:

Class VoIP:

Recommended Minimum Bandwidth: 517 Kbps/50% (PeakRate)

Detected applications and data:

Application/ AverageRate PeakRate Total

Protocol (kbps/%) (kbps/%) (bytes)

rtp audio 76/7 517/50 703104

Class Interactive Video:

Recommended Minimum Bandwidth: 24 Kbps/2% (AverageRate)




rtp video 24/2 5337/52 704574

Class Transactional:

Recommended Minimum Bandwidth: 0 Kbps/0% (AverageRate)




citrix 36/3 74/7 30212

sqlnet 12/1 7/

arquitectura de redes qos 16

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