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Cisco Bug: CSCus95092 - stale entry in mvlan table causing 2960x to stop learning a given MAC

Last Modified

Feb 12, 2018

Products (150)

  • Cisco Catalyst 2960-X Series Switches
  • Cisco Catalyst 2960C-12PC-L Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco IE 2000-16TC-G Industrial Ethernet Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
  • Cisco IE 2000-4T-G Industrial Ethernet Switch
  • Cisco Catalyst 2960X-24PS-L Switch
  • Cisco Catalyst 2960X-48LPS-L Switch
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Known Affected Releases

15.2(2)E1

Description (partial)

Symptom:
2960x switch suddenly stops learning MAC when the MAC was previously learned once through MAB and port is set to be configured automatically using ASP/macros.

Conditions:
When Radius server passes the Vlan_ID attribute towards a port (MAB enabled) and also passes the macro which starts pushing it's configuration (removing all Authentication related commands and configuring the port for trunk) in the middle of authorization process, then a stale mvaln entry might be created  (may be after this complete process is executed 4-5 times consecutively) for the given MAC address/Vlan combination. 

Now when Anti macro is running to convert the trunk port to default access port in such condition, then stale mvlan entry stays there and switch does not learn the MAC again on that port unless the switch port is configured with trunk or with that specific access Vlan which is mapped to that MAC address present in mvaln stale entry.
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