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Cisco Bug: CSCul10906 - 69XX - Multicast Packets are limited

Last Modified

Apr 02, 2015

Products (35)

  • Cisco IP Phone 8800 Series
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 7941G
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Known Affected Releases


Description (partial)

Multicast traffic is limited on 69xx.  

The multicast traffic is going from the 69xx network port to a PC connected on the PC port, same phone.

The speed for the multicast transmission decreases a lot when the phone is in between

if there is no phone connected, the transmission speed for multicast traffic is about 10 -12 MB

When the phone is there, the speed reduces to 2MB

69xx  processing multicast traffic and passing them to the PC port

firmware 9.3.3
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