[c-nsp] Dual-homing without BGP

Pete Templin petelists at templin.org
Thu Feb 16 21:40:36 EST 2006

Vincent De Keyzer wrote:
[massive snippage]
> 3.       If link to T or N fails, T or N respectively stop announcing the
> /23.

How will T or N know to stop announcing the /23?  Does T withdraw the 
/23 currently if the T link goes down?

> 4.       With a combination of PBR (which I am not too familiar with) and
> floating routes, they would control on which link traffic will go out (based
> on server source address) according to the last requirement above.

As others have pointed out, PBR is CEF-switched, but you're still 
talking about increased CPU to do a PBR lookup on every packet.  Make 
sure the router(s) has sufficient CPU.

And to echo other sentiments, just use BGP.  Doing it without is just 
such a kludge.


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