CCNP Practical Studies: Troubleshooting

Inter-VLAN Routing

There are three different ways to perform inter-VLAN routing. If you have the luxury of an 8500 or 12000 GSR, assigning an individual port to each VLAN is an optimal solution. If not, you can trunk between a switch and a Fast Ethernet router interface by taking advantage of subinterfaces. Alternatively, RSMs on Cat5000/5500 or MSFCs on Cat6000/6500 work just fine. This means you are inserting a router on a card into a Catalyst slot in which you session into the module number. My lab hardware lends itself more toward the router-on-a-stick approach. If you are using one of the other methods, however, you can find some great examples at Cisco.com.

Router on a Stick

Figure 7-7 illustrates the router-on-a-stick scenario in which ...