Subject: BGP - 2547 VPNS

From: PamSri <[email-masked]>
Date: Mon, 18 Nov 2002 08:37:55 -0800 (PST)

In BGP this is the very basic/fundamental concept
involved in withdraw:
When sending a withdraw message you dont send all the
path attributes that you had advertised along with the
prefix before. All you have to do is send the prefix
as unfeasible.

The short answer for your question is:
i. understand the messaging process for "withdraw" in
BGP.
ii. read & understand the MP-UNREACH message.

- pamsri

Rajesh wrote:

-------- Original Message --------
Subject: BGP - 2547 VPNS
Date: Fri, 15 Nov 2002 06:57:11 -0800 (PST)
From: Rajesh Potti <[email-masked]>
To: [email-masked]

Hi,
In BGP for 2547 VPNs, can a VPN-IPv4 route be send
with a set of route targets and then a withdraw with
only 
a subset of the route targets. This will be a partial
withdraw. How does a router handle a partial 
withdraw? 

If the route is removed from only the vpns in which 
there is an import Route target match, future updates
for the route with a set of route targets will  result

in inconsistencies. 

Thanks,
Rajesh 

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