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Cisco Bug: CSCsz04297 - Cat6k: False Dynamic MAC entry is installed with format 0000.<LTL>.0000

Last Modified

Feb 16, 2017

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

12.2(18)SXF15a 12.2(18)ZY 12.2(33)SXH

Description (partial) 

Symptom:

Unexpected MAC addresses may be installed in CAM table:-

Switch#sh mac-address-table vlan 350 | i 5/48
*  350  0000.012f.0000   dynamic  Yes          5   Fa5/48

With port-security configured, violations will be triggered:-

%PORT_SECURITY-SP-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 0000.012f.0000 on port FastEthernet5/48.

Conditions:

This was observered on a Catalyst 6500 running IOS 12.2(18)ZYA1 with PIM configured on the SVI and IGMP Snooping disabled globally.
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