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Use the keepalive interface configuration command to set the keepalive timer for a specific interface. The no form of this command turns off keepalives entirely.
keepalive [seconds]
seconds | (Optional) Unsigned integer value greater than 0. The default is 10 seconds. |
10 seconds.
Interface configuration.
This command only applies to ASP interfaces. You can configure the keepalive interval, which is the frequency at which the switch sends messages to itself (Ethernet) or to the other end (auxiliary), to ensure a network interface is alive. The interval is adjustable in 1-second increments down to 1 second. An interface is declared down after three update intervals have passed without receiving a keepalive packet.
Setting the keepalive timer to a low value is very useful for rapidly detecting Ethernet interface failures (transceiver cable disconnecting, cable unterminated, and so on).
A typical serial line failure involves losing Carrier Detect (CD). Since this sort of failure is typically noticed within a few milliseconds, adjusting the keepalive timer for quicker routing recovery is generally not useful.
The following example sets the keepalive interval to 3 seconds.
Switch(config)# interface ethernet 2/0/0
Switch(config-if)# keepalive 3
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