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Cisco Bug: CSCuq05728 - RSP FO in cluster system with Scale config leads to sync failures

Last Modified

Jan 30, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.3.BASE

Description (partial)

Symptom:
After RPFO in an ASR9k cluster system, NSR is not ready state due to sysdb config and data replication not complete.

Conditions:
1) This issue is seen when RSP failover  is triggered in an ASR9k cluster system with scaled configuration of 450k+ lines of config. 
2) The failure to sync happens on a cluster system when the ACTIVE RSP and ACTIVE  SWITCH (switch  being used for the front panel sfp+ ports) are not on the same RSP card.
3) Most common scenario : SFP+ links on RSP0 are given higher priority. So assuming ACTIVE RSP of Primary DSC is 0/RSP0/CPU0 or 1/RSP0/CPU0, and on next RPFO when ACTIVE RSP of Primary DSC is 0/RSP1/CPU0 OR 1/RSP1/CPU0 you are most likely to see the issue.

 
Example of this case :  0/RP1/CPU0 is the ACTIVE RSP and 0/RP0/CPU0 is the ACTIVE SWITCH

RP/0/RP1/CPU0:GOT-PE1#admin show dsc                     
---------------------------------------------------------
           Node  (     Seq)     Role       Serial State
---------------------------------------------------------
     0/RP0/CPU0  (  409267)  STANDBY  FOX1746GJ08 NON-DSC
     0/RP1/CPU0  (       0)   ACTIVE  FOX1746GJ08 PRIMARY-DSC <--------------------
     1/RP0/CPU0  (  387405)  STANDBY  FOX1740G1AE NON-DSC
     1/RP1/CPU0  (  468594)   ACTIVE  FOX1740G1AE BACKUP-DSC

RP/1/RP0/CPU0:GopaTB#sh nv edge control control-link-protocols location 0/RP0/CPU0 | begin Prio
Priority lPort             Remote_lPort      UDLD STP
======== =====             ============      ==== ========
0        0/RP0/CPU0/0     1/RP0/CPU0/0     UP   Forwarding <---------------------
1        0/RP0/CPU0/1     1/RP1/CPU0/1     UP   Blocking  
2        0/RP1/CPU0/0     1/RP1/CPU0/0     UP   On Partner RSP
3        0/RP1/CPU0/1     1/RP0/CPU0/1     UP   On Partner RSP
Active Priority is 0
Active switch is   RP0 <----------------------------------------------------------------------
CLM Table version is 20
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