prosafe layer 3 switching demetrios coulis [email protected] [email protected]...

ProSafe Layer 3 Switching

Demetrios Coulis [email protected] Line Manager

NETGEAR

mailto:[email protected]

2.© 1996-2004 NETGEAR® . All rights reserved

Agenda

» What is Layer 2 switching?» What is Layer 3 switching?» Difference between Layer 2, Smart and Layer 3 management» Why do I need Layer 3?» When/how to up sell the customer


OSI Networking Model (Ethernet)

1. Physical data encoding (“What’s on the wire?”)

2. Data Link layer (MAC addresses)

3. Network layer (IP addresses)

4. Transport layer (TCP port numbers or “applications”)

5. Session

6. Presentation

7. Application (API)


Layer 2 Switching

» Switches act like a traffic cop• Transmits data between devices within the same “VLAN”

» A VLAN or “Virtual Local Area Network” is simply a grouping of ports» Broadcasts contained within a VLAN

» Decision for next hop is based on the MAC address• MAC addressing is Layer 2 information

» Dedicated bandwidth per port• Non-blocking architecture ensures total bandwidth and prevents

dropped packets» Full-Duplex

• Collisions eliminated from the days of shared access hubs» 10M, 10/100M, 10/100/1000M and now 10G speeds


Layer 2 Switching

GSM7224

GSM7224

FVX538

FSM726S

FSM750S


Layer 3 Routing

» Routers “route” traffic between separate L2 VLANs» VLANs are isolated broadcast domains

• If you connect 2 together it becomes one large broadcast domain» VLAN can also be thought of as a “network”

• A group of hosts that share the same network prefix (192.168.1.x)» Decision for next hop is based on the destination IP address

• Remember: IP addressing is Layer 3 information» 10M, 10/100M and 10/100/1000M speeds

» This is the way it used to be done…• ….slowly…


Layer 3 Routing

GSM7224

GSM7224

FVX538

FSM726S

FSM750S


Layer 3 Switching

» New technology – “Put’s the “Routing” into the switch”• Layer 3 look-ups are pushed into ASICs

» ASICs = Application Specific Integrated Circuits

» Layer 3 is no longer “slow”• End-users don’t have to pay a penalty for “routing”• The old adage “Switch when you can, Route when you must” no

longer applies» Layer 3 switching occurs at “wire-speed”

• As fast as the wire can theoretically transmit data» 10M, 10/100M, 10/100/1000M and 10G speeds


» Broadcasts are isolated and L3 switching is efficient

Applications(2)

GSM7328S

GSM7328S

FVX538

GSM7352S

GSM7352S

orXSM7312

(future)


Unmanaged Switches

» Use L2 information (MAC addresses)» Invisible to the network» Simple to set up/use» Most affordable» Common for

• Smaller networks• Edges of large networks• Small user groups• Conference rooms• Dorm rooms


L2 Smart Switches

» Use L2 information (MAC addresses)» Smart Switch Discovery Tool assigns an IP address» Accessable via WEB Graphical User interface» Give an IT manager access

• Observe network• Configure ports• Configure VLAN, trunks, priority, etc.

» Easy to use» Can act as unmanaged » Used in networks >50 users


L2 Managed Switches

» Switch information only at Layer 2 (using MAC addresses)» Configurable via serial console port

• Complete configuration, including IP address assignment» IP addressing gives access to Telnet, SSH, SNMP and WEB

interfaces» Complete control over Layer 2 parameters» IT manager can

• Observe network, including RMON (Remote Monitoring via SNMP)• Enable disable port-level parameters• Complete configuration fo VLANs, trunks, Quality of Service, etc.

» Easy to use» Currently only stackable solution» Used in networks >50 users


Switch PortfolioUnmanaged Smart Layer 2 Layer 3

10/100 Gigabit 10/100 Gigabit 10/100 Gigabit 10/100 Gigabit

5 pt FS105FS605

GS105GS605

8 pt FS108FS608FS108P

GS108GS608GS108T

12/16 pt

FS116FS116PJFS516

GS116GS516TJGS516

GS716T GSM7212 GSM7312

24+ pt FS524JFS524JFS524F

GS524TJGS524JGS524F

FS726TFS726TPFS728TS

GS724TGS724TSGS724TPS

FSM726FSM726S

GSM7224 FSM7328S

FSM7326P

GSM7324

GSM7328S

48+ pt FS750T2

FS752TPS

GS748T

GS748TS

GS748TPS

FSM750S GSM7248 FSM7352S

FSM7352PS

GSM7352S

Ch

assis

GCM9306

GCM9048

GCM9024

GCM9124

Includes Roadmap Products


L3 Managed Switches

» Same features and functionality as Layer 2 Managed switches» Supports L3 switching between VLANs when needed

• Most flexible product to deploy» L3 is there when/if you need it

» Interoperates with other routers to share routing information• RIP v1, v2 standards• OSPFv2 standards

» Offloads edge router• Segments networks• Latest features (Priority, Security, BW)

» More expensive & sophisticated» Used in networks > 100


Why / When do you need Layer 3 switching?

» When VLANs grow too large• Heavy broadcast loads slow a network down

» To separate user groups• Organizational requirements

» Finance, Manufacturing, Engineering

• Security requirements» Layer 3 Access Control Lists (ACLs) help to prevent access

• Uptime requirements» Small user groups are easier to troubleshoot» Decreases downtime


» Broadcasts are isolated and L3 switching is efficient

Efficient Network Infrastructure

GSM7328S

GSM7328S

FVX538

GSM7352S

GSM7352S

orXSM7312

(future)


How do I sell Layer 3 switching?

» When large “flat” VLANs grow too large and cause outages• Segmented Networks

» Run faster» Less Congested» Down less frequently

» To meet IT or organizational requirements• Functional segmentation• Security concerns• Uptime requirements and reliance on the network

» Layer 3 switching can be sold into any size network• Generally can start as small as 50-100 users• Can also integrate and interoperate in large “enterprise”

networks already in place» Branch Office, Remote Office requirements

prosafe layer 3 switching demetrios coulis [email protected] [email protected]...

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