[c-nsp] Failover with multiple upstreams running BGP

[Gert Doering]

Hi,

On Thu, Feb 21, 2008 at 04:05:00PM +0500, Junaid wrote:
> Just wanted to know what practice is carried out in the ISP world.
> Backups are provided by advertising supernets via the secondary
> upstream link or AS path prepending is used on the secondary links?

as-path prepending plus upstream BGP community setting (to lower local-pref
on the backup link).

In many cases, having both ISPs active at the same time is a much saner
decision, though (as there is always one network that has crappy connectivity
to your primary uplink, and good connectivity to the "backup").

gert

-- 
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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