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

Oliver Boehmer (oboehmer) oboehmer at cisco.com
Mon Mar 31 14:26:20 EDT 2014


 
>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




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