[c-nsp] BGP question

[Kshitiz Singhal]

   Hi,

If there is no filter on then router automatically advertise prefixes 
learned via IBGP are advertised to E Bgp peers.
u need to put filter to stop advertisement of unwanted prefix.

Regards.
kshitiz
----- Original Message ----- 
From: "James Hampton" <james.hampton at gmail.com>
To: <cisco-nsp at puck.nether.net>
Sent: Tuesday, September 21, 2004 9:14 PM
Subject: [c-nsp] BGP question


>I am seeing some unexpected behavior. I have 2 boarder routers each
> are IBGP together and EBGP with there perspective providers. On br2 I
> have a prefix list with all our internal prefixes going out and
> another filtering bogons in, so far so good. But I currently only have
> 1 network statement with one prefix advertised so I can test the link
> on br2. All was good when I checked the providers route server I only
> saw the 1 network I was advertising. Than when I brought up IBGP
> between the two boarder routers and suddenly all our internal prefixes
> were learned by the provider on br2 even though I was only explicitly
> advertising 1 network via the network statement. Does a router
> automatically advertise prefixes learned from an IBGP peer to a EBGP
> peer?
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