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AOS-CX VSF and VSX Flashcards

7 cards from real ACSP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In AOS-CX VSX, what is the primary purpose of the Inter-Switch Link (ISL)?

    Answer: To synchronize control-plane state and pass data traffic between VSX peers

    The ISL carries both synchronized control-plane state (MAC tables, ARP, routing) and acts as a data-plane path when traffic must traverse between VSX peers.

  2. What happens to VSX operations if the keepalive link fails but the ISL remains up?

    Answer: Operations continue normally because the ISL is the primary health link

    When only the keepalive fails, VSX continues normally since the ISL remains up and is used for both state sync and peer-alive detection.

  3. Which VSX role is elected based on the configured priority value, with a higher number winning?

    Answer: Primary

    The VSX Primary role is elected based on priority; the switch with the higher configured priority becomes Primary and typically owns the active gateway functions.

  4. In VSX, what is the Active Gateway feature used for?

    Answer: Providing a shared virtual IP and MAC so both VSX peers can route traffic locally

    Active Gateway assigns both VSX peers the same virtual IP and virtual MAC, allowing each peer to locally route traffic without bouncing across the ISL.

  5. When configuring a VSX MCLAG (Multi-Chassis LAG), what must be consistent on both VSX peers for the LAG to function correctly?

    Answer: The LACP system-ID and port-channel configuration must match

    MCLAG requires the same LACP system-ID (configured as VSX system-MAC) and matching port-channel parameters on both peers so the downstream device sees a single logical LAG.

  6. In a VSX split-brain scenario where the ISL and keepalive both fail, which peer continues forwarding traffic?

    Answer: The Secondary peer shuts down its MCLAG interfaces

    In split-brain, VSX designates the Secondary peer to shut down its MCLAG interfaces, ensuring the Primary peer continues forwarding and avoiding duplicate traffic.

  7. Which AOS-CX command verifies that VSX peers are synchronized and shows the synchronization status of routing protocols?

    Answer: show vsx status

    The 'show vsx status' command displays the VSX peer state, ISL and keepalive status, and which protocols are currently synchronized between peers.