Hi, On Sun, May 17, 2015 at 08:40:08PM +0100, Dan Peachey wrote: > > IOS XR 4.3.4SP6 on ASR9001. [..] > > I have used this in the past on ASR9001 which was running 4.3.4 SP1 IIRC. > Unfortunately I don't have access to this network anymore to double check > but I'm pretty certain this is not the behaviour I observed. The > best-external path should be seen as an additional path in the BGP table > but not be installed in the RIB/FIB as far as I understand.
Glad you say that :-) - so this might turn out to be a bug, or some
combination of "things", and not intended behaviour...
> I assume there is nothing else in your BGP config which might be causing
> this? No 'additional-paths' or 'maximum-paths' commands for example?
Unless it's on-by-default, no. "show run formal | inc path" only
has route-map / as-path stuff, nothing regarding add-path etc. (which
my other routers don't support, so I'm not yet going there).
OTOH, I seem to be good at finding combinations of options that make
XR BGP misbehave... ("update wait-install" reliably gets bgpd into a
hanging state, waiting for ipv4_rib, which is locked waiting for
itself... case is open, but needs more testing to fully understand
all circumstances)
gert
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