Scenario: A Citrix Administrator configured a Citrix ADC active-passive, high availability (HA) pair. The HA pair failed over and customers were unable to access hosted websites. The administrator troubleshoots and discovers that the upstream router is NOT updating its ARP table.
What can the administrator configure to resolve this issue?
In a Citrix ADC high availability pair, when a failover occurs, the new active node might have a different MAC address than the original active node. The upstream router might have cached the MAC address of the original active node and hence, would not update its ARP table immediately, causing connectivity issues. Configuring Virtual MAC (VMAC) addresses allows the HA pair to share a single MAC address, ensuring that the upstream router does not need to update its ARP table during a failover, thereby maintaining uninterrupted service.
D is correct: https://docs.citrix.com/en-us/citrix-adc/current-release/networking/interfaces/configuring-vmacs.html