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Cisco Bug: CSCum47601 - interface stuck in Negotiating state during mlacp switchover cli command

Last Modified

Mar 07, 2018

Products (1)

  • Cisco 7600 Series Routers

Known Affected Releases

15.1(3)S3

Description (partial)

Symptom:

One of the links takes approx 80-90 seconds to transition from STANDBY to ACTIVE when "mlacp switchover bundle-etherx" is performed.

Evidence:
RP/0/RSP0/CPU0:ar13.ptlelab#sh bundle bundle-e 15
Port                  Device           State        Port ID         B/W, kbps
  --------------------  ---------------  -----------  --------------  ----------
  Gi0/0/0/10            Local            Standby      0x016e, 0xa005     1000000
      mLACP peer is active
  Gi0/0/0/11            Local            Standby      0x016e, 0xa006     1000000
      mLACP peer is active
  Gi0/0/0/10            207.173.7.246    Active       0x016d, 0x9004     1000000
      Link is Active
  Gi0/0/0/11            207.173.7.246    Negotiating  0x016d, 0x9005     1000000
      Partner is not Synchronized (Waiting, not Selected, or out-of-date) <<<<<< Issue


 Conditions:
Only when we cli command "mlacp switchover bundle-etherx"

Other methods of failover scenarios mentioned below, there are no issues.
1. Link Failure:
The member can be removed from the bundle using any of the following events:
Fiber pull at either end of the POA-DHD link. (NB: This is the most representative way of testing this scenario.)
Shut down the POA-DHD link on the DHD.
Shut down the POA-DHD link on the POA.
Remove the bundle membership configuration on either end of the POA-DHD link.

2. Device Failure:
This  represents a meltdown of the router carrying the traffic; total loss of  the node. The only valid test trigger for this event is a hard reset  (power down) of the device, even a router reload is not truly  representative as the device will tend to go down in a series of  indeterminate stages.
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