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Cisco Bug: CSCur66067 - 6880X Active VSS switch shows "UNKNOWN" RRP state for the peer.

Last Modified

Sep 24, 2018

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.2(1)SY

Description (partial)

Symptom:
Active VSS switch shows "UNKNOWN" RRP state for the peer(STANDBY) in the output of "show vslp rrp detail" 
.
M-VSS#sh vslp rrp d
 RRP Summary:
--------------------------------------------------------------------
RRP information for Instance 1

--------------------------------------------------------------------
Valid  Flags   Peer      Preferred  Reserved
               Count     Peer       Peer

--------------------------------------------------------------------
TRUE    V        1           1          1

        Peer  Valid  Switch   Status   Priority     Role     Local   Remote
Switch  Group        Number            Oper(Conf)            SID     SID
-----------------------------------------------------------------------------
Local    0     TRUE    1       UP      110(110)     ACTIVE    0       0   
Remote   1     TRUE    2       UP      100(100)     UNKNOWN   8380    1170 <<<

Following this, if the STANDBY gets reloaded for any reason, it will not be able to attach back to ACTIVE and will result in Split-brain scenario (ACTIVE-ACTIVE).

Post this if DUAL-ACTIVE is configured it will result in "recovery-mode" .

Conditions:
The issue has only been observed if Console is "hung" .
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