How many VMAC addresses are supported for IPv4 and IPv6 stacks simultaneously in Aruba CX VSX?

• A. Sixteen total VMACs are supported as shared
• B. Eight VMACs per stack
• C. Sixteen VMACs are supported for IPv4 and IPv6 stacks simultaneously
• D. Thirty-two VMACs per pair of stacks

Answer: (C)

VMAC addresses in Aruba CX VSX come from a single pool that the two VSX switches share. This pool can be used by both IPv4 and IPv6 stacks at the same time, so the same virtual MACs can be applied regardless of which IP protocol is in use. The pool size is sixteen, meaning you can allocate up to sixteen distinct VMAC addresses for use across IPv4 and IPv6 contexts concurrently. This is why the correct choice is that sixteen VMACs are supported for IPv4 and IPv6 stacks simultaneously—the answer highlights both the total limit and the fact that they can be used by both stacks at once. The other options don’t fit because they imply a per-stack allocation or a different total that doesn’t reflect the cross-stack, shared pool behavior.