To interpret AOS-CX event logs correctly for the ACP-S exam, you must understand the syntax used by the VSX Daemon (hpe-vsxd) when reporting the status of Multi-Chassis Link Aggregation Groups (MC-LAGs).
Anatomy of the Log Message:
hpe-vsxd: This indicates the message is generated by the VSX synchronization process.
VSX 2: This refers specifically to Virtual Port Channel (or VSX LAG) ID 2. It does not refer to the switch member ID, but the logical LAG ID.
State local down: This means the physical member ports assigned to LAG 2 on the switch you are currently logged into (the " local " switch) are operationally down.
remote up: This indicates that via the Inter-Switch Link (ISL), the switch has learned that its VSX peer (the " remote " switch) still has its physical member ports for LAG 2 in an " up " state.
Operational Impact: In a healthy VSX environment, an MC-LAG should ideally show " local up, remote up. " When a log shows " local down, remote up, " it signifies a partial failure of the multi-chassis aggregation. Traffic destined for the device connected to LAG 2 will now only flow through the peer switch.
Why other options are incorrect:
Option A: If the secondary switch were down entirely, the " remote " status would typically be reported as " down " or " unknown " because the ISL/Keepalive synchronization would be lost.
Option B: If it were down on both, the log would read " local down, remote down. "
Option D: Keepalive failures are reported with different Event IDs (typically involving the " keepalive " keyword) and affect the overall VSX role state (Split-Brain recovery), not a specific LAG ID.
Key Practice Tip: Always look for the keywords local and remote in VSX logs. They provide an immediate health snapshot of the synchronized state between the two core switches.
