Hi.
I sent a network provider (who shall remain protected
by a pseudonym like "AS 174") a brief note stating that
they had a prefix that was flapping rather heavily
throughout the day.
I cut and pasted a show ip bgp on the route, pointing out
that the prefix flaps on the order of once a minute and was
happily being dampened. (cf. my comments Monday afternoon on
dampening).
BGP routing table entry for 204.4.27.0 255.255.255.0, version 656911
Paths: (2 available, no best path)
1239 174 (history entry)
144.228.101.1 (metric 15) from 144.228.50.6 (144.228.56.1)
Origin IGP, metric 1, localpref 90, external
Dampinfo: penalty 2915, flapped 199 times in 3:27:31
1239 174 (history entry)
144.228.101.1 (metric 15) from 144.228.50.3 (144.228.53.1)
Origin IGP, metric 1, localpref 90, external
Dampinfo: penalty 2917, flapped 198 times in 3:27:07
I also asked this nameless service provider to kindly check
into this somewhat excessive amount of flap with a view to
seeing how it could be made to flap less.
Here was the reply.
Hopefully saner and more patient folks than me might point
out to service provider X that announcing to the entire
world when a dialup user comes and goes is not healthy for
the Internet, and it shouldn't happen, particularly not at
this rate.
Why I am not quite in the, "it doesn't matter, they'll
be dampened" frame of mind will get explained during
the NANOG session.
Sean.
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