[c-nsp] ebgp load balancing using maxiumu-paths TCAM impact on Sup720-3BXL?

Gert Doering gert at greenie.muc.de
Thu May 21 13:45:01 EDT 2009


On Thu, May 21, 2009 at 12:34:00PM +0300, Ibrahim Abo Zaid wrote:
> If 2 upstream provider provides exactly same routes with same attributes so
> BGP will select 2 routes to each destination then TCAM will reach its
> maximum as installed BGP routes will be doubled but if some destination are
> preferely reachable from one of them and 2nd route will be backup route , so
> BGP routes won't be doubled but that depends on percentage

Unless you use BGP multipath, BGP will only install one route to the FIB,
ever.  So while *BGP* will use twice the amount of memory, TCAM won't.

USENET is *not* the non-clickable part of WWW!
Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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