Easy question on frame-relay map and Split Horizon

[news2010a]

If the following is issued on a Cisco router:

frame-relay map ip 10.1.1.1 200

What will be the end result ? (select all that apply)

a) Split horizon is disabled

b) Inverse ARP is disabled

c) Inverse ARP is enabled

d) Split horizon is enabled

I see that answer b) is correct for sure.

However, I am puzzled by a) and d).

Is there any affect in split horizon at all ? In my view, I think that split horizon would remain enabled, and therefore answer d) would be correct as well.

Can someone there confirm whether I am right ?

[pkhatri · Accepted solution]

Hi,

IMHO, the only correct answer is b). Split horizon is a function of routing protocols and applies when you use multiaccess interfaces. Now, on a FR multiaccess interface you can either create IP to DLCI mappings manually or use inverse-ARP. The fact that you use one or the other has absolutely no impact on split-horizon. The fact remains that the interface is still a multiaccess interface.

Paresh.

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