[c-nsp] ebgp and ibgp

[Mark Tinka]

On Thursday 02 October 2008 07:14:57 Darryl Dunkin wrote:

> IBGP sends the best route to the other IBGP peers, not
> both. Border2 knows about the multiple routes itself, but
> only sends the one best path to Border1.

Just to add, we generally wouldn't prefer such a deployment, 
because packets could unpredictably bounce between border 
routers before they figure out which is the best path 
off-net.

What we do (and if it doesn't cost you extra, I'd recommend 
you do) is make sure eBGP routes learned by one border 
router aren't learned by another. These eBGP routes should 
only be learned by your edge routers, to which your 
customers attach. This way, your edge routers (or a route 
reflector, if you have one), would install the best path, 
and traffic destined toward a particular border router will 
surely exit that border router to the Internet.

Cheers,

Mark.
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