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Configuring InterVLAN Routing on the MSFC
Figure 12-1
When Host A in VLAN 10 needs to communicate with Host B in VLAN 10, it sends a packet that is
addressed to that host. Switch A forwards the packet directly to Host B without sending it to the router.
When Host A sends a packet to Host C in VLAN 20, Switch A forwards the packet to the router, which
receives the traffic on the VLAN 10 interface. The router checks the routing table, determines the correct
outgoing interface, and forwards the packet out the VLAN 20 interface to Switch B. Switch B receives
the packet and forwards it to Host C.
Configuring InterVLAN Routing on the MSFC
Note
This section is for users who are familiar with Cisco IOS software and have some experience configuring
Cisco IOS routing. If you are not familiar with configuring Cisco routing, refer to the Cisco IOS
documentation on Cisco.com.
These sections describe how to configure interVLAN routing on the MSFC:
•
•
•
•
•
MSFC Routing Configuration Guidelines
This section describes the guidelines (which consists of two main procedures) for configuring
interVLAN routing on the MSFC:
1.
2.
The VLAN interfaces on the MSFC are virtual interfaces. However, you configure them the same as you
do a physical router interface.
The MSFC3, MSFC2, MSFC2A, and MSFC support the same range of VLANs as the supervisor engine.
MSFC3, MSFC2, and MSFC2A support up to 1,000 VLAN interfaces, and the MSFC supports up to 256
VLAN interfaces.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
12-2
Basic InterVLAN Routing Topology
VLAN 10
Switch A
A
Host
B
Host
ISL Trunks
MSFC Routing Configuration Guidelines, page 12-2
Configuring IP InterVLAN Routing on the MSFC, page 12-3
Configuring IPX InterVLAN Routing on the MSFC, page 12-3
Configuring AppleTalk InterVLAN Routing on the MSFC, page 12-4
Configuring MSFC Features, page 12-5
Create and configure VLANs on the switch and assign VLAN membership to switch ports. For more
information, see
Chapter 11, "Configuring VLANs."
Create and configure VLAN interfaces for interVLAN routing on the MSFC. Configure a VLAN
interface for each VLAN for which you want to route traffic.
Chapter 12
VLAN 20
Switch B
C
Host
Configuring InterVLAN Routing
OL-8978-04
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