Cisco CCNA / CCNP Certification Exam Lab: Frame Relay Subinterfaces And Split Horizon
Earning your Cisco CCNA and CCNP is a tough proposition, and part of that is the fact that you quickly learn that theres usually more than one way to do things with Cisco routers and while thats generally a good thing, you better know the ins and outs of all options when it comes to test day and working on production networks. Working with Frame Relay subinterfaces and split horizon is just one such situation.
One reason for the use of subinterfaces is to circumvent the rule of split horizon. You recall from your CCNA studies that split horizon dictates that a route cannot be advertised out the same interface upon which it was learned in the first place. In the following example, R1 is the hub and R2 and R3 are the spokes. All three routers are using their physical interfaces for frame relay connectivity, and they are also running RIPv2 172.12.123.0 /24. Each router is also advertising a loopback interface, using the router number for each octet.
R1(config)#int s0
R1(config-if)#ip address 172.12.123.1 255.255.255.0
R1(config-if)#no frame...
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