[isp-bgp] ibgp behavior with two links to same neighbor AS

["Colo Host" <ispcolohost@...>]

Hi all, can someone tell me the normal behavior of iBGP
between two routers who both peer with the same remote
AS?  I have two routers peered with each other in my AS
and they both have a link to the same remote AS and are
receiving full routes.  Should my two routers be sharing
their learned routes with each other even though they're
basically learning the same thing?  I'm seeing just one
share its routes with the other but not vice versa, so if
that one loses it's link to the remote AS, traffic trying
to leave via that router gets stuck.  It does start flowing
again about two minutes later because it seems the loss
of that upstream link causes it to start receiving, or the
other router to start advertising, the routes out through
that other router.

If that is normal behavior, are there common tricks that can
be used to increase the propagation speed of routes via
BGP, external and internal?  I'm finding that in a mixed-vendor
network, some combos fully load the Internet table much
quicker than others from their peers where bandwidth is
not the limiting factor.

Thanks,

D







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