From: Robert Slaski (robin@atm.com.pl)
Date: Tue Dec 10 2002 - 06:50:45 GMT-3
Tran Tien Phong wrote:
[replying to all posts in the thread]
> For RIP, although you configure neighbor command, RIP updates still sent to multicast address 224.0.0.9. You need to define an access-list to prevent this
>
You can filter 224.0.0.9 but you can use 'passive-interface' as well.
This will disable broadcasting updates, still allowing unicast updates
to be sent.
>
> This is true for RIP but I am not sure about EIGRP. I know for a fact that
> in EIGRP the passive-interface will prevent the formation of neighbors.
In EIGRP 'passive-interface' disables processing all types of hellos,
including unicast ones.
>
> I believe the neighbor command is used to send routing annoucements as
> unicast packets instead of multicast or broadcast cast packets. For
Neighbor command hardly nowhere documented on Cisco site and it's not
recommended and not supported by Cisco as well (there's one techtip and
one bug regarding this, but I can't find it right now).
Nevertheless eigrp neighbor command works (although I didn't test it in
all topologies) and this can save your soul on the real exam.
mikrobi,
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