Implementing InterVLAN Routing

Overview 4-1

Module Objectives 4-1

Describing Routing Between VLANs_4-3

Overview 4-3

Objectives 4-3

Inter-VLAN Routing Using an External Router 4-4

Describing Inter-VLAN Routing Using External Router Configuration Commands 4-6

Configuring Inter-VLAN Routing Using an External Router 4-8

Configuring an External Router Using ISL 4-10

Verifying the Inter-VLAN Routing Configuration Using ping 4-11

Verifying the Inter-VLAN Routing Configuration 4-12

Example: Displaying Inter-VLAN Configuration Information 4-12

Example: Displaying Routing Table Information 4-13

Explaining Multilayer Switching 4-14

Layer 2 Switch Forwarding 4-15

Layer 3 Switch Forwarding 4-16

Frame Rewrite 4-18

Which Switching Tables Are Used? 4-19

TCAM Table 4-20

Summary 4-21

Enabling Routing Between VLANs on a Multilayer Switch_4-23

Objectives 4-23

Describing Layer 3 SVI 4-24

Describing Configuration Commands for Inter-VLAN Communication on a Multilayer Switch 4-25

Configuring Inter-VLAN Routing on a Multilayer Switch 4-26

Describing Commands for Routed Ports on a Multilayer Switch 4-27

Describing Routed Ports on a Multilayer Switch 4-28

Configuring Routed Ports on a Multilayer Switch 4-29

Summary 4-30

Deploying CEF-Based Multilayer Switching_4-31

Overview 4-31

Objectives 4-31

Explaining Layer 3 Switch Processing 4-32

Distributed Hardware Forwarding 4-33

Explaining CEF-Based Multilayer Switches 4-35

Identifying the Multilayer Switch Packet Forwarding Process 4-37

CEF-Based Tables and MLS Lookups 4-38

FIB Table Updates 4-39

ARP Throttling 4-40

CEF-Based MLS Operation 4-42

Describing CEF Configuration Commands 4-43

Enabling CEF-Based MLS 4-44

Verifying CEF 4-45

Describing Common CEF Problems and Solutions 4-46

Describing CEF Troubleshooting Commands 4-48

Display CEF Statistics 4-49

Troubleshooting Layer 3 CEF-Based MLS 4-52

Summary 4-55

Module Summary 4-56

References 4-56

Module Self-Check 4-57

Module Self-Check Answer Key 4-58

© 2006 Cisco Systems, Inc. Building Cisco Multilayer Switched Networks (BCMSN) v3.0 v vi Building Cisco Multilayer Switched Networks (BCMSN) v3.0 © 2006 Cisco Systems, Inc.

BCMSN

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