Symptom
If there is any TC after upgrade to 6.2.(6), 6.2.(6a) or 6.2.(8), then after approximately 90 days of active supervisor uptime, STP TC BPDUs are sent out every 2 seconds for a long period of time.
Conditions
Nexus 7000 or 7700 running 6.2(6), 6.2.(6a), or 6.2(8).
Workaround
In order to circumvent this issue until an upgrade to fixed code can be performed,
execute the appropriate workaround depending on whether you have a dual-supervisor or single-supervisor
configuration before each 90 days of Active supervisor uptime.
For dual-supervisor setups:
1. Reload the standby supervisor using cli "reload module x" where x is standby supervisor slot number.
2. Use the 'show module' command to confirm that the standby supervisor is up and in the ha-standby mode.
3. Use the 'system switchover' command to switch to the standby supervisor.
For single-supervisor setups:
1. Upgrade to 6.2.6b or 6.2.8a, depending on your business requirements.
2. Reload the switch.
Further Problem Description
Active Supervisor Uptime can be found from "show system uptime":
N7K-7009-3# show system uptime
System start time: Fri Oct 25 09:40:58 2013
System uptime: 236 days, 8 hours, 56 minutes, 59 seconds
Kernel uptime: 110 days, 23 hours, 7 minutes, 49 seconds
Active supervisor uptime: 110 days, 23 hours, 2 minutes, 23 seconds <<<<<<<<<<<
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