[j-nsp] 6PE RR & next-hop resolution best practices

[Adam Vitkovsky]

Hi Ivan, James,

To be honest I was improvising a bit with this one as we are using bgp.l3vpn-inet6.0 (6VPE) so I thought that 6PE would use bgp.inet6.0 but Ivan you’re right 6PE would be using inet6.0.
Alright so by default the inet6.0 would try to resolve NHs in inet6.3 right?
So it needs to be changed to resolve NHs in itself (while the loopbacks are leaked into inet6.0) so I guess the last piece of the config should actually be:

set routing-options resolution rib inet6.0 resolution-ribs inet6.0


adam

From: Ivan Ivanov [mailto:ivanov.ivan at gmail.com]
Sent: 18 May 2015 14:29
To: Adam Vitkovsky
Cc: James Jun; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] 6PE RR & next-hop resolution best practices

Hi Adam,
I am not sure if your solution will do the job. Do you have this in production?
Table bgp.inet6.0 is a IPv6 table of routing-instance called 'bgp' or?
Routes from label-unicast inet6 family are put in inet6.0 table not in bgp.inet6.0.
James will confirm that after he tests it. It might be that I am wrong.
Ivan,

On Mon, May 18, 2015 at 7:24 AM, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk<mailto:Adam.Vitkovsky at gamma.co.uk>> wrote:
Hi James

> James Jun
> Sent: 16 May 2015 16:20
>
> The problem however is that I'm using the P's also as route-reflectors for
> distributing BGP throughout the network.  So, I need the RR's to make
> correct BGP best-path decisions, but they can't do that on 6PE routes without
> having inet6.3 table to reference the ipv4-mapped-in-v6 next-hops against.
>
I'm sorry I misunderstood the problem so the problem isn't that the P's are trying to do IPv6 lookup instead of label-switch the packets between PEs but the problem is that RRs are not advertising the IPv6 prefixes because they can't select the best paths so the IPv6 prefixes are not being exchanged between the PEs right?

To resolve the NHs you can do:
set routing-options rib-groups 0-to-6 import-rib inet.0
set routing-options rib-groups 0-to-6 import-rib inet6.0
set routing-options rib-groups 0-to-6 import-policy loopbacks

set protocols isis/ospf rib-group inet 0-to-6

This should create the ipv4-mapped-in-v6 (ffff::ipv4) addresses in inet6
And then you tell BGP to resolve the NHs in inet.6:

set routing-options resolution rib bgp.inet6.0 resolution-ribs inet6.0


adam
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--
Best Regards!

Ivan Ivanov
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