From: Nick Keir (nickkeir@xxxxxxxxxxx)
Date: Thu Nov 15 2001 - 14:22:03 GMT-3
Check the terminology. I took a long time to get my head around this.
Using an inbound distribution list on an OSPF router will affect the
"routes" placed into the routing table. It will not affect in any way the
"links" learned from OSPF neighbors from which these "routes" are derived.
Therefore, all updates sent to neighbors will continue to include all the
"links" and so neighboring routers may still derive a "route" from one or
more of them.
An outbound distribution list will have no effect whatsoever if applied to
an interface. However, when redistributing from a protocol such as IGRP or
RIP where OSPF is learning directly from the routing table, an outbound list
applied to the OSPF process can be used to specify which routing table
entries OSPF will add to its database of "links" and advertise to its
neighbors.
Now you're probably more confused than ever! Get Jeff Doyle's Routing
TCP/IP Vol 1. Chapter 9 is the best imaginable explanation of how OSPF
works. Look at his chapter on route filtering as well. Make sure you skip
the bit where he describes the workings of Dijkstra's algorithm or you'll
quickly lose interest!
Nick
----- Original Message -----
From: "Rajeev Siddappa" <raj_lab@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, November 14, 2001 4:09 PM
Subject: Distribute-list and OSPF
> Can some one explain me how does distribute list work
> for OSPF
>
> I understnd that it will not efffect when u use it as
>
> distribute list 1 out interface
>
> but how is it working when I use the same as
>
> distribute list 1 in interface .
>
> Pls forward me if you ahve any documents.
>
> Thanks,
>
> Rajeev.
>
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