[c-nsp] BGP Fast-external-fallover

[David Barak]

--- John Neiberger <John.Neiberger at efirstbank.com>
wrote:
> We're migrating from a frame relay environment to an
> MPLS-based VPN
> using BGP for routing. Our provider does have BGP
> dampening configured.

Wait, your provider is dampening you, their customer? 
Something's not right here - generally dampening is
used toward peers, not customers, because dampening is
the converse of the SLA approach.  Personally, I
wouldn't pay for service from a provider which would
willfully permit me to remain down...

> In that sort of environment, would it be beneficial
> or not to use bgp
> fast-external-fallover? I can see that in the case
> of the circuit that
> is bouncing often that it might cause our routes to
> be dampened. 

This is a certainty.  

> On the
> other hand, if a circuit just takes a quick hit,
> which is probably more
> likely, the BGP session will re-establish quicker.
> 

If the difference between the BGP timers and the
interface timers is really that important to you,
dampening needs to be entirely off the table.



David Barak
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