From: Skinner, Stephen (Stephen.Skinner@rbs.co.uk)
Date: Wed Jun 28 2006 - 13:00:52 ART
guys,
I have tried the CCO and I have tried the archive and have had no luck ,
This is not a nice question , so I apologise in advance.
I have a BGP network and I want the fastest convergence (when a route is
missing) as possible. (WITHOUT modifying anything in BGP , just using the
defaults)
can i first confirm a couple of things.
in a single BGP router.
imagine full mesh. 1 route map to allow in networks
1.If i add a network to a route map , and nothing else
the BGP scanner will pick this up after a potential 60secs (depending on the
timing cycle)
and then advertise it out to its peers (providing its allowed) yes ?
i should not need to do a "clear ip BGP blah" command.
2.If a network goes missing , an update will be sent to BGP neighbours to
tell them about this.
this will only happen when the BGP scanner picks this up , which in theory
could be 60 seconds yes ?
the reason i ask is because of the following.
i have been told that IBGP will converge faster than EBGP
the reason for this is that a BGP command "update interval" which can
modify how often updates are sent.
and that by default an IBGP neighbour sends out an update every 5secs
.
but for EBGP it sends it out every 30sec.
so that would mean IBGP converges quicker than EBGP .
i cant find this command on the CCO .
also i believe this is in not related to convergence after a route is lost.
but is related to how often standard updates are sent.
i believe EVEN if there is such a command , when i loose a route , BOTH IBGP
and EBGP will send out a update (because triggered updates is on by default)
at the same time,
therefore both IBGP and BGP will converge at the same time.
am i wrong? , to be honest i don't know .
TIA
Stephen Skinner
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