[c-nsp] BGP add-path with MPBGP/VPNv4

[Arie Vayner (avayner)]

Add-path is a relatively new implementation so would only appear in the newer IOS versions...
As this is an MPLS VPN environment there is an easy fix... You can use different RD values for the different default routes (on the VRFs originating the defaults). This would "trick" the RR to advertise both routes (because the different RD values make them different VPNv4 prefixes).

Arie 

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Andrew K.
Sent: Thursday, December 5, 2013 10:09 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] BGP add-path with MPBGP/VPNv4

I have a VRF configuration with MP-BGP/MPLS.

In vrf A there are two default gateways being advertised to the route-reflectors.

Half of the PE devices in VRF A need to send traffic out one gateway and the other half out the other, but the route-reflectors are only sending one best route to the PE.

Digging up info on add-path, it appears to have very limited support, I can not find support for it using the feature set navigator for anything other then the ASR1000, 7600, 3900 and IOS XR.

Is this feature supported by the 7200?

Can it be used in a VPNv4/VRF environment?

Should I just be doing BGP Multipath Load Sharing instead and use a route-map to set the weight of the default route for each PE device?

Thanks in advance for your time.
Andrew.


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