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Cisco Bug: CSCta46864 - IP Phone(CP-7961) stops sending CDP packets to the switch port

Last Modified

Mar 01, 2018

Products (25)

  • Cisco Unified IP Phone 7900 Series
  • Cisco Unified IP Phone 7945G
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified IP Phone 7911G
  • Cisco Unified IP Phone 7941G
  • Cisco Unified IP Phone 7961G-GE
  • Cisco Unified Wireless IP Phone 7925G
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Known Affected Releases


Description (partial)


CP-7961 sends CDP packets at unstable intervals and stops sending to the switch port.
Other protocols continue to be sent by the CP-7961. 
The issue occurs after booting the PC. 

3 minutes after stopping CDP, a Cat3750 switch port which was connected to CP-7961 and PC got DOT1X-5-SECURITY_VIOLATION error.
After this, the phone and the PC cannot be used (never authenticated) till doing a shut and no shut on the switch ports.


dot1x is configured on the SW port that CP-7961 is connected.
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