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Cisco Bug: CSCuo70191 - HSRP Virtual MAC learned but not flushed after an L2 network split.

Last Modified

Feb 14, 2018

Products (81)

  • Cisco IOS
  • Cisco C892FSP Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 2951 Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 861W Integrated Services Router
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Known Affected Releases

15.1(4)M6.10 15.3(3)M 15.3(3)M3

Description (partial)

HSRP Virtual MAC learned but not flushed after an L2 network split.

EHWIC-4ESG switch port is not behaving as a normal L2 switch would in terms of MAC learning.   It looks like either it should not be learning a vMAC from an outside source when it itself (or its L3 router) has reserved the MAC or it should be behaving as a normal switch would (and should be paying attention to the source MAC of packets from the router itself).
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