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Cisco Bug: CSCub21489 - Duplex Mismatch on PC-Port of IP Phone causes slow speed

Last Modified

Sep 22, 2020

Products (34)

  • Cisco IP Phone 8800 Series
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7962G
  • Cisco Unified Wireless IP Phone 7925G
  • Cisco Unified IP Phone 7941G
  • Cisco Unified IP Phone 7961G-GE
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Known Affected Releases

9.3(1)

Description (partial)

Symptom:
Duplex mismatch on the link between the PC and the PC port of the 6945 IP phone resulting in low throughput in direction PC -> IP phone. 
The link establishes to 100Full on PC port of IP phone, whereas it is 100Half on the PC, creating duplex mismatch.

Conditions:
Load is SIP 9-3-1-5.

Topology:
Cat_4510 - IP phone - PC

Cat_4510 is set with Auto 10/100.
PC is set with Auto 10/100/1000. 

IP phone related settings for failing scenarios:
1) Automatic Port Synchronization - ENABLED, Switch port remote config - AUTO, PC Port remote config - AUTO
2) APS - ENABLED, SW port - DISABLED, PC port - AUTO
3) APS - ENABLED, SW port - AUTO, PC port - DISABLED
4) APS - ENABLED, SW port - DISABLED, PC port - DISABLED

Related Community Discussions

<key>CSCub21489</key> - Duplex Mismatch on PC-Port of IP Phone causes slow speed
Hello Is it possible this bug is also present in 7962G model with  SCCP42.9-3-1SR2-1S? I have same kind of behavior with that phone type.
Latest activity: Dec 09, 2013
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