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Cisco Bug: CSCvv19634 - SF 7014 SR: Transient traffic loss seen on SRMS labeled prefixes during standby RP reload

Last Modified

Sep 17, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.0.14.BASE

Description (partial)

Symptom:
Problem statement:
~~~~~~~~~~~~~~~~~
We have a dual RP setup, where ISIS has an embedded SRMS client which communicates with the SRMS server for route updates which are usually pushed from the server side. The SRMS client connects to the server using the waipc_connect() with the service name "SRMS-API" . The srms server spawns with the waipc_publish() with the same service name "SRMS-API". 


When we boot up with configuration, there are seperate instances of ISIS and SRMS running on the active and standby RPs.  The srms client on the active connects to the SRMS server on the active. The same is true on the standy side, where the SRMS client connects to the SRMS server on the standby. 


Under the following conditions 
 1. Boot up with configuration having both segment-routing and isis. ?process restart isis? and Reload the standby RP.
 2. Do not have ISIS configuration at boot up, but have segment-routing configuration. Add ISIS configuration after boot up. Reload the standby RP 
 3. Have segment routing and ISIS configuration, Issue a ?no router isis? followed by ?rollback configuration last 1?. Restart the RP.

If you restarted the SRMS process instead of restarting RP, you would not see the traffic loss.

Conditions:
Under the following conditions 
 1. Boot up with configuration having both segment-routing and isis. ?process restart isis? and Reload the standby RP.
 2. Do not have ISIS configuration at boot up, but have segment-routing configuration. Add ISIS configuration after boot up. Reload the standby RP 
 3. Have segment routing and ISIS configuration, Issue a ?no router isis? followed by ?rollback configuration last 1?. Restart the RP.
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