pull-ups on route annoucements to deter route flap
barrett at daisy.ee.und.ac.za
Mon Apr 24 13:58:54 UTC 1995
Randy Bush wrote:
> To move along an other tangent... What is the general wisdom on putting
> pull-ups on route annoucements to deter route flap?
I don't know about the general wisdom, but Internet Africa (not a North
American operator) uses pull-ups for all routes that belong to
single-homed customers. We figure that there's no reason for BGP speakers
around the world to hear the flap when one of our single-homed customers
drops a route.
> Hence, you won't get the !H until you get to our border.
> Los pobre packitos will travel all the way and then get whacked. Seems
> to subvert one interpretation one could read into the intent of BGP.
I don't have stats, but I don't worry about the added load. TCP backs off
pretty quickly when it figures out that the packets aren't getting
through. Poorly-behaved UDP applications are another story, of course,
but we hope there's not too much of that.
--apb (Alan Barrett)
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