[c-nsp] interesting ASR 9k bgp multipath issue

[John van Oppen]

Yes, I did, but my point is that behavior is not the same or at least appears not to be the same on IOS, I want ibgp multipath but only for things with matching IGP metrics, is there a way to tweak that.

-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
Sent: Monday, March 31, 2014 11:26 AM
To: John van Oppen; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] interesting ASR 9k bgp multipath issue


 
>so, I have some internally anycasted prefixes (DNS resolvers) as well as
>bgp maximum paths set to allow both ibgp and ebgp multipath.   Oddly, as
>you can see below the multipath appears to think two paths are 
>identical even when they have different IGP metrics (path #1 and path #2), any idea
>if this is a bug or how to fix it?    Obviously if the IGP cost is the
>same it should load share, but if not it really should not be doing 
>what is shown below since the paths are not equal.

John, what exactly did you configure in your BGP address-family? It looks like you enabled "maximum-paths eibgp <n>", which also considers paths with different metrics as multipath candidates.

	oli