Abhijit,
I wouldn't bother try to handle a bug in someone else's
implementation. You certainly shouldn't try to install
multiple LSA since they are identified soly by the
(type, lsid, advertising router) tuple. Hence I'd say
that as long as you don't crash you are ok.

Abhijit Kumbhare wrote:
> If I receive 2 AS-external-LSAs with the same LS ID
> (which for some reason happens to be in a broadcast IP
> address format) - same advertising router but
> different masks - how do I handle it?
>
> For me a buggy neighbor router is advertising all the
> AS-external-LSAs with LS ID in the broadcast address
> format (this format in itself is not totally against
> the RFC - RFC 2328 appendix section E - algorithm for
> assigning LS IDs - does allow you to advertise in that
> format). The bug part is that is that it is sending 2
> different LSAs with same LS ID.
> e.g. 208.144.0.0/17 and 208.144.96.0/19 routes have
> the same broadcast address 208.144.127.255. So this
> buggy router sends me the 2 LSAs with this LS ID.
>
> Should I install 2 different LSAs or only one? Which
> mask (smaller or longer)? I checked the same with a
> Cisco router - and it installed only one of them
> (smaller mask).
>
> I know it should not be advertised in this fashion
> (because the RFC says that LSAs are identified by LS
> ID, advertising router & LS type - then seq number,
> checksum, age in that order).
>
>
>
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--
Acee

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