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Cisco Bug: CSCum77450 - Incorrect mac address tables synchronisation on stack of 2960s

Last Modified

Nov 27, 2020

Products (1)

  • Cisco Catalyst 2960-S Series Switches

Known Affected Releases

15.0(2.0.0)

Description (partial)

Symptom:
Mac address tables are not fully in sync in between 2960s stack members:

Example:

rem com all show mac address-table  count | i Space
Switch : 1 : (Master)
---------------------
Total Mac Address Space Available: 7910   <---- different value then other members

Switch : 2 :
------------
Total Mac Address Space Available: 7906

Switch : 3 :
------------
Total Mac Address Space Available: 7906

Switch : 4 :
------------
Total Mac Address Space Available: 7903

Conditions:
Found in 15.0(2)SE4
Mac addresses are seen from port channel based on physical ports coming from individual stack members.
Observed the issue when the number of port member was higher then 4

example:

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
6      Po6(SU)         LACP      Gi1/0/20(P) Gi2/0/20(P) Gi3/0/20(P)
                                 Gi4/0/1(P)  Gi4/0/20(P)
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