Disaster recovery using as-prepend?

Todd Vierling tv at duh.org
Fri Feb 17 20:55:47 UTC 2006

On Thu, 16 Feb 2006, Warren Kumari wrote:

> If your primary is connected to ISP_A and the backup is connected to ISP_B,
> customers connected to ISP_B MAY still flow to your backup DC (ISP_B will
> probably set local preference on all customer routes - you should be able to
> override this behavior with communities but not all providers support this (or
> honor it 100% of the time!))

And in addition to that, even multihomed customers of ISP_B may choose the
prepended route for a number of different reasons; for instance, ISP_B might
be a cheaper pipe for them, or there may be a smart-ish routing device or
scheme in play that overrides normal BGP decision making.

-- Todd Vierling <tv at duh.org> <tv at pobox.com> <todd at vierling.name>

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