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Cisco Bug: CSCuq09084 - vrrs mac advert appears twice in help output

Last Modified

Feb 14, 2020

Products (20)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases


Description (partial)

VRRP failure in CSR platform due to VMware vSwitch rejection of packets.   The root cause is that vSwitch is non standards compliant and does not do MAC learning, like any normal switch would do.   This means that it will not interoperate with an FHRP (which uses a virtual MAC).    To work around this Cisco will implement a workaround wich forces the FHRP to use a Burned in MAC Address (a BIA).   Note that end hosts will need to re-program their ARP or ND caches on a failover due to this vSwitch limitation and associated workaround.

VRRP configuration on CSR platforms
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