When configuring an Aruba CX VSX Inter-Switch Link Protocol, what is the default Hello interval?

When configuring an Aruba CX VSX Inter-Switch Link Protocol, what is the default Hello interval?

• A. Hello interval is disabled by default
• B. Hello interval is based on the value set by dead interval
• C. hello interval is 100ms by default
• D. Hello interval is 1s by default

Answer: (D)

The concept being tested is how often the Inter-Switch Link Protocol sends Hello messages to keep the VSX peer alive. Hello messages are periodic keep-alives that verify the neighboring switch is reachable, and the timer for these messages sets how quickly a failure is detected versus how much control traffic is generated. By default, the protocol sends a Hello every second. This 1-second interval provides prompt failure detection while keeping overhead modest, which is a sensible default for maintaining a stable VSX pair. If a neighbor stops responding, the link will be considered down after the allowed window for missing Hello messages (the dead interval), which is typically a multiple of the Hello interval—so with a 1-second Hello, the dead interval would be a few seconds. The other options aren’t used by default: the Hello interval isn’t disabled by default, it isn’t automatically derived from the dead interval, and it isn’t set to a very short 100 ms by default.

The concept being tested is how often the Inter-Switch Link Protocol sends Hello messages to keep the VSX peer alive. Hello messages are periodic keep-alives that verify the neighboring switch is reachable, and the timer for these messages sets how quickly a failure is detected versus how much control traffic is generated.

By default, the protocol sends a Hello every second. This 1-second interval provides prompt failure detection while keeping overhead modest, which is a sensible default for maintaining a stable VSX pair. If a neighbor stops responding, the link will be considered down after the allowed window for missing Hello messages (the dead interval), which is typically a multiple of the Hello interval—so with a 1-second Hello, the dead interval would be a few seconds.

The other options aren’t used by default: the Hello interval isn’t disabled by default, it isn’t automatically derived from the dead interval, and it isn’t set to a very short 100 ms by default.