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Cisco Bug: CSCuq66142 - Provide a mechanism to protect mac-addresses from being secured

Last Modified

Jun 08, 2017

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.1(2)SY3

Description (partial)

Symptom:
In Catalyst 6500, a mac-address entry in the CAM table does not have a port listed.

Switch#show mac-address address 0023.abd6.9000
Legend: * - primary entry
        age - seconds since last seen
        n/a - not available
  vlan   mac address     type    learn     age              ports
------+----------------+--------+-----+----------+--------------------------
*  998  0023.abd6.9000   dynamic  Yes          0           <<===

Switch#sh mac-address-table address 0023.abd6.9000 detail
MAC Table shown in details
========================================
PI_E RM  RMA Type Alw-Lrn Trap Modified Notify Capture Flood   Mac  Address  Age  Pvlan  SWbits Index  XTag
----+---+---+----+-------+----+--------+------+-------+------+--------------+----+------+------+------+----
Yes  No   No  DY    Yes    Yes    No      No     No     No    0023.abd6.9000 0x04 106    0      0xA019 0

"Trap" flag is set to "Yes".
Conditions:
This issue occurs when the frame from the default-gateway is looped by a end-host and the port is configured with Dot1x in restrict mode. Under this scenario, when authentication fails, system installs the mac-address with a drop result.

Catalyst 6500 running 12.2(33)SXI or later release.
AND
Dot1x authentication violation mode set to "restrict".
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