Re: [nsp] Duplicated IP address

From: Stephen Sprunk (ssprunk@cisco.com)
Date: Wed Jul 10 2002 - 17:52:43 EDT


Thus spake "Juan" <wenxuecity2001@yahoo.com>
> I just noticed that we can configure duplicated ip
> address on serial interfaces like this:
> The routing table shows two routes and it will load
> balance the outbound packets
>
> C 192.0.9.0/24 is directly connected, Serial0/1
> is directly connected, Serial0/0
>
> Why is this allowed? I tried this on p2p ATM
> interface, it complained about overlapping
> address(which sounds right to me). Is there any
> legitimate use for this?

It's a holdover from the RIP days to support load balancing over serial links;
it's not allowed on any other type of interface, and it's been intentionally
removed from the IOS docs. Many features don't account for this configuration
(and aren't tested with it) and therefore you may run into odd behavior if you
use it.

S



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