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Cisco Bug: CSCvu46244 - WLC not updating fastpath table after a GW GARP failover

Last Modified

Aug 07, 2020

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases

8.10(121.0) 8.8(125.0)

Description (partial)

After a failover of the device hosting the gateway, the WLC continues to list the previous gateway┬┤s mac address.

You can check if you are hitting this bug by issuing the following commands:
show arp switch
show arp kernel
debug fastpath cfgtool --tun4db.dump

you will notice that the correct mac address is displayed for the default gateway on the "show arp switch" and "show arp kernel" output.

but the "debug fastpath cfgtool --tun4db.dump" will still give you the old mac address next to "txDestMac"

Gateway had virtual IP address for HA but physical MACs
Gateway did a failover via Gratuitous ARP
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