[c-nsp] HA / SSO - IOS XR 3.6.1

[Atif Sid]

Q. SSO on GSR IOS XR is default?

I have *not configured* LDP GR, NSF IETF on my IOS XR router; when RP
failover occurs it does not see any packet loss; puzzled.

LAB :

PE1 (7606) --> P1 (GSR XR) --> P2 --> (GSR XR) --> PE3 (7606)


PE1#sh mpls ld graceful-restart
LDP Graceful Restart is disabled
Neighbor Liveness Timer: 120 seconds
Max Recovery Time: 120 seconds
Forwarding State Holding Time: 600 seconds

I reloaded the RP on P1; traffic goes through no packet loss. good but how?

RP/0/9/CPU0:P1#sh mpls ldp graceful-restart
RP/0/9/CPU0:P1#

RP/0/8/CPU0:P2#sh mpls ldp graceful-restart
RP/0/8/CPU0:P2#

RP/0/9/CPU0:P1#sh mpls ldp neighbor br
Peer              GR Up Time         Discovery Address
----------------- -- --------------- --------- -------
10.10.136.128:0 N  02:21:26                3      10
10.10.136.2:0   N  02:21:04                2       6
10.10.136.3:0   N  02:21:00                2       9
RP/0/9/CPU0:P1#

RP/0/9/CPU0:P1#sh isis neighbors
IS-IS NRP neighbors:
System Id      Interface        SNPA           State Holdtime Type IETF-NSF
P2             Gi0/1/1/8        *PtoP*         Up    25       L2   Capable
PE1            Gi0/1/1/0        *PtoP*         Up    24       L2   Capable
PE1            Gi0/1/1/1        *PtoP*         Up    27       L2   Capable
P3             PO0/0/0/0        *PtoP*         Up    25       L2   Capable



PE1#ping

Protocol [ip]:

Target IP address: pe3

Repeat count [5]: 50000

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 50000, 100-byte ICMP Echos to 10.10.136.130, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!



!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (50000/50000), round-trip min/avg/max = 1/1/92
ms