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Cisco Bug: CSCup56548 - ATA187 resets when ARP reply contains a new MAC address (HSRP/GLBP)

Last Modified

Nov 27, 2020

Products (34)

  • Cisco SIP IP Phone Software
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified Wireless IP Phone 7925G
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 7941G
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Known Affected Releases


Description (partial)

ATA187 resets when ARP Reply contains a mac-address which doesn't match its ARP cache.
For example:
ATA sends an ARP reuqest for 
ATA gets 00:07:b4:00:01:01 as ARP response
After a while:
ATA sends another ARP request for 
ATA gets 00:07:b4:00:01:02 as ARP response

First Hop Redundancy Protocols like HSRP/GLBP is used in the local LAN segment.
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