RE: BGP convergence time internet

Sounds like some angst their Joe :)

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Joseph L. Brunner
Sent: Friday, June 10, 2011 12:51 AM
To: Maarten Vervoorn; Cisco certification
Subject: RE: BGP convergence time internet

This is depending on the carriers in question.

With ATT & Level 3 about a 1 minute.

With Cogent, could be many minutes or never happen.

Therefore, you need to do a turn-up test with your provider and test failover. That way if they are doing anything stupid (like redistributing your blocks to OSPF and Cogent and their little tier-2 Downstream ISP's ALWAYS use them regardless of the prepends (COGENT!!!) (how annoying is that)

So have fun!

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Maarten Vervoorn
Sent: Friday, June 10, 2011 3:25 AM
To: Cisco certification
Subject: OT: BGP convergence time internet

Hi group,

I've got a question a about the convergence over the internet.

For example if we have two datacenters one in the US and one in the
Netherlands and we run a BGP AS between those datacenters wtih US as primary
entry point and the one in the netherlands will be pre-pended serveral time
to make it the backup entry point. If the primary connection fails and stop
advertising the route, how long will it take before US will receive updates
from the netherlands?

Thanks in advance

Maarten

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Received on Fri Jun 10 2011 - 10:47:43 ART