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Cisco Bug: CSCup81353 - STP current timer rollover after 100 days and repeated TC's

Last Modified

Sep 17, 2019

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

6.1(2)I2(2.53) 6.1(2)I2(2.81)

Description (partial)

On Nexus 9000 switch, if there is any Topology Change during the uptime of the switch and if the switch uptime exceeds 90-100 days then the STP timer rolls over (overruns) and STP Topology Change BPDUs are sent every hello interval (ie 2 sec)

Nexus 9000 Switch running for about 90 to 100 days and experienced a TCN during the uptime of the switch.

Active Supervisor Uptime can be found from "show system uptime":

N9K-RTP-ESC# 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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