endpoint liveness (RE: Do ATM-based Exchange Points make sense an ymore?)

Stephen Sprunk ssprunk at cisco.com
Mon Aug 12 13:44:53 UTC 2002


Thus spake "Vadim Antonov" <avg at exigengroup.com>
> It makes little sense to detect transient glitches.  Any possible reaction
> on those glitches (i.e. withdrawal of exterior routes with subsequent
> reinstatement) is more damaging than the glitches themselves.

(Ignoring BGP for the moment, which has no clue of the reliability of its links)

That's due to the "slow down, fast up" nature of IETF protocols.  Do you really
want a link or routing protocol claiming your link is "up" if it passes only 33%
of your keepalives?

IMHO, the key to fast-response protocols is reversing this behavior: require
(say) 10 keepalives in a row for a link to be "up", and missing one forces it
"down".

S




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