Re: BGP convergence time internet

Thanks Joseph for you awnser.

We want to connect our AS to three different providers 2 int the netherlands
and 2 in the US (one is the same in US and netherlands)
Providers will probably be Globalcrossing, ATT and one other
But when we stop advertising in the US the route needs to pass from the
netherlands to all different AS-es to update the US with the prefix. (Could
that be done in 1 minute?)

Sure testing is what we will do. But if the convergence time can be over 15
minutes we need to come up with a other plan,

Maarten
2011/6/10 Joseph L. Brunner <joe_at_affirmedsystems.com>

> 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 - 12:40:09 ART