[c-nsp] ME3600 BGP Route-Maps and IPv6 (WAS: Re: preference on bgp route advertisements)

[Reuben Farrelly]

On 6/03/2012 10:29 PM, Reuben Farrelly wrote:

>> Have you tested whether having a dedicated route-map for the
>> IPv6 session works around this problem?
>
> Yes - it doesn't work around it. I have just replicated the route-map
> exactly but removed the IPv4 specific match (seq 10) from the new copy
> and it works as expected (ie correct community set as a default/fall
> through even for IPv6 routes).
>
> And...get this...if I add:
>
> ipv6 prefix-list PERMIT-IPV6-ANY seq 10 permit ::/0 le 48
>
> route-map IBGP-STATICS permit 5
> match ipv6 address prefix-list PERMIT-IPV6-ANY
> set origin igp
> set community 38858:202
>
> at the top of the route-map sequence (which should match first for IPv6
> routes, right?), then IPv6 BGP routes seemingly do NOT match that
> route-map even across session resets - as that (unique) community value
> is never set.
>
> So it looks to me very likely it's a matching problem in that the match
> ip prefix list is matching IPv6 routes when it should be an IPv4 only
> match and then, only a specific IPv4 match.

Correction.  I made a mistake in my testing there...

If I have:

ipv6 prefix-list PERMIT-IPV6-ANY seq 10 permit ::/0 le 64

Then yes the IPv6 specific route-map matches first and the correct 
community is set.

Reuben