Henry's Points

Keepalive command is default on Interface Level. It does a lookback testing for every 10 seconds. it is called the “Configuration Test Protocol.” It is not part of the IEEE 802.3 standard, but it is part of the original Ethernet Standard. We can look the reference for details.

If we type “no keepalive” on interface level, we basically disable loopback testing for the link. Therefore, “no keepalive” is used to prevent the Cisco switch from disabling its uplinks due to “Loopback” cause.

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