Chapter 12 Configuring Intervlan Routing; Understanding How Intervlan Routing Works - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Configuring InterVLAN Routing
This chapter describes how to configure the Multilayer Switch Feature Card (MSFC) for interVLAN
routing on the Catalyst 6000 family switches.
For complete syntax and usage for the commands used in this chapter, refer to the Catalyst 6000
Note
Family Command Reference publication.
This chapter consists of these sections:
•
•
Note Refer to the FlexWAN Module Port Adapter Installation and Configuration Notes for information
about configuring routing on FlexWAN module interfaces.

Understanding How InterVLAN Routing Works

Network devices in different VLANs cannot communicate with one another without a router to forward
traffic between the VLANs. In most network environments, VLANs are associated with individual
networks or subnetworks.
For example, in an IP network, each subnetwork is mapped to an individual VLAN. In an IPX network,
each VLAN is mapped to an IPX network number.
Configuring VLANs helps control the size of the broadcast domain and keeps local traffic local. When
an end station in one VLAN needs to communicate with an end station in another VLAN, interVLAN
communication is required. This communication is provided by interVLAN routing. You configure one
or more routers to route traffic to the appropriate destination VLAN.
Figure 12-1
VLAN 20. The router has an interface in each VLAN.
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Understanding How InterVLAN Routing Works, page 12-1
Configuring InterVLAN Routing on the MSFC, page 12-2
shows a basic interVLAN routing topology. Switch A is in VLAN 10 and Switch B is in
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
C H A P T E R
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12-1