BGP "Allowas-in" -- scenarios to use this?

Hi Groupstudy List--

While learning the ins and outs of BGP I've come across something I'm
a bit fuzzy on--

In BGP we have this configuration option under the neighbor
configuration of "allowas-in" which defeats BGP's loop prevention
mechanism and allows the programmed router to accept routes that
already contain it's own AS in the AS PATH list. Does anyone actually
implement this in their production environment? I'm interested to
know what kind of scenarios would require this.

Thanks,
David Swafford.

Blogs and organic groups at http://www.ccie.net
Received on Tue Aug 18 2009 - 10:25:09 ART