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Cisco Bug: CSCsz94821 - Phone re-auth in 6k open mode rcvs MAB timeout when voice present

Last Modified

Feb 05, 2017

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases


Description (partial)

Basic Description: 

When an Open Mode, MAB authenticated IP phone is re-authenticated (server based re-authentication 
with Terminate-Action default) and when an audio call is in place, MAB times out and the interface 
stays in the 'running' state indefinitely with unknown MAC and IP.


After re-authentication has been initiated, reference to MAC address 0000.0000.0000 is shown in 
the debugs and MAB times out leaving the switch port in the 'Running' state with unknown MAC 
address and IP address.


The IP phone must be MAB authenticated  to a switch port set up for Open Mode. The problem does 
not occur in Closed Mode. Server based re-authentication was used with Session-Timeout set to 120 
and Terminate-Action set to default (0). The host mode used was multi-domain.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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