Monday, August 23, 2021

Migrating L2VPN services from IOS XE to XR, LDP issues

Hi,

we're in the process of migrating from an IOS XE platform to an IOS XR one. In some cases, we're gonna collapse 2 XE routers on a single XR one. Since we have only L2VPN services with mpls pseudowires, I thought that it would be enough to migrate the loopbacks we use for pseudowires neighbor statement and that would be enough. Not the case.

Apparently while IOS XE will bring up any circuit that has a mpls pseudowires that points to a reachable IP address, IOS XR will only bring up circuits that are matching its LDP router id.

So, if I am migrating two routers onto one, only the circuits that point to the IP that is also the router LDP router ID will come up, others will not.

Since some of these PEs ave in excess of 4k xconnects configured on them I'd rather not modify the IP addresses. Is there a way to modify XR behaviour to match XE, so that it will bring up a l2vpn instance as long as LDP can be routed towards the target IP?

Thanks.



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