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Cisco Bug: CSCvs85528 - MAC is not synced across DFCs if packet is snooped by DHCP snooping feature

Last Modified

Apr 27, 2020

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases


Description (partial)

In fail-over scenario where MAC address table needs to be updated by a Gratuitous ARP, the GARP packet is received on the ingress DFC card but may not be synchronized immediately with the other DFC cards in the switch.

Source MAC address is already learned in the MAC address table on the original interface.
DHCP snooping is enabled for the VLAN.
When GARP packet is received on new interface, MAC move does not happen instantaneously.
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