To address a VPX HA failover issue without gratuitous ARP (GARP) support, what immediate step can you take?

• A. Migrate the VPX pair to different hypervisor hosts
• B. Replace the NetScaler VPX appliances with NetScaler MPX appliances
• C. Utilize IPv6 instead of IPv4
• D. Configure a Virtual MAC (VMAC) on the NetScaler

Answer: (D)

When a VPX HA pair lacks Gratuitous ARP support, the immediate fix is to enable a Virtual MAC (VMAC) on the NetScaler. VMAC assigns a dedicated, shared MAC address for the VIP that stays the same across both HA members. With this setup, failover can occur without needing the network to learn a new MAC via ARP/GARP—the same MAC is consistently presented to the switch, so traffic continues to reach the active appliance without extra network advertising. The other options don’t address how MAC reachability is maintained during failover: changing hypervisors, replacing VPX with MPX, or switching to IPv6 don’t solve the lack of MAC-ownership continuity that VMAC provides.