HPE7-A08 · Question #24
Your network monitoring system has issued a critical alert indicating that the ISL between two VSX core switches is down. What can you determine from the log output below?
The correct answer is A. Core-2 has disabled its VSX LAG interfaces. The logs show multiple messages such as: "VSX ISL port lag256 is OUT-OF-Sync with the peer: link is down" "VSX state local down, remote down" "VSX 2 state local up, remote down" "VSX 5 state local up, remote down" These messages indicate that Core-2 detects the ISL as down and…
Question
Your network monitoring system has issued a critical alert indicating that the ISL between two VSX core switches is down. What can you determine from the log output below?
Exhibit
Options
- ACore-2 has disabled its VSX LAG interfaces.
- BKeepalive packets are being dropped.
- CBoth switches are forwarding traffic over VSX LAGs.
- DDownstream switches are not able to forward traffic.
How the community answered
(15 responses)- A60% (9)
- B27% (4)
- C7% (1)
- D7% (1)
Explanation
The logs show multiple messages such as: "VSX ISL port lag256 is OUT-OF-Sync with the peer: link is down" "VSX state local down, remote down" "VSX 2 state local up, remote down" "VSX 5 state local up, remote down" These messages indicate that Core-2 detects the ISL as down and therefore its VSX LAG interfaces have been automatically disabled, which is the expected protection behavior when a VSX split is detected (or when the ISL goes down and the keepalive is still up). This prevents a split-brain condition and stops Core-2 from forwarding traffic across VSX LAGs until the ISL recovers.
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