ASR 9k MPLS LDP Non-Stop Routing (NSR) issue

[Stephen Craven]

We are running a textbook MPLS VPN using EIGRP as the IGP on ASR 9006s running a mix of IOS XR 6.2.3 and 5.3.4.

Before Non-Stop Routing (NSR) was enabled for LDP we experienced a 60+ second outage on VPN traffic when performing a 'redundancy switchover' on a transit router.

After enabling NSR for LDP this outage was reduced to ~10 seconds.

mpls ldp
 nsr
 router-id 172.30.0.2
 interface TenGigE0/1/0/16
 !
 interface TenGigE0/1/0/17
 !
 interface Serial0/0/0/0/1/1/3:0

Both routing and LDP neighborships stay up during the switchover.

How do we troubleshoot this brief traffic outage?

EIGRP is not supported by NSR. Could this be a cause of the issue?

Thanks!

Stephen

[smilstea]

When you say MPLS VPN using EIGRP you mean EIGRP is CE facing protocol right? Core IGP should be OSPF or ISIS.

MPLS LDP should have no knowledge of EIGRP.

Sam