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Cisco Bug: CSCul65858 - GARP is sent from a non-Active HSRP router for a NAT ip-address

Last Modified

Apr 17, 2019

Products (17)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
  • Cisco 7600 Series Route Switch Processor 720 with 10 Gigabit Ethernet Uplinks
  • Cisco ASR 901-4C-F-D Router
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Known Affected Releases

15.2(4)S3 15.3(3)S1

Description (partial)

GARP for the NAT-inside-global-address is sent from a non-Active HSRP router.
The problem is seen when one of the redundancy pair is reloaded and the interface comes up.
Because of the behavior, traffic loss is seen on the NAT traffic.

When receiving the GARP, active router shows the duplicate address message like below.

%IP-4-DUPADDR: Duplicate address x.x.x.x on GigabitEthernetx/x/x, sourced by xxxx.xxxx.xxxx

The problem is seen on ASR1K platforms
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