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The commands shown in this chapter apply to the Catalyst 8540 MSR, Catalyst 8510 MSR, and LightStream 1010. Where an entire command or certain attributes of a command have values specific to a particular switch, an exception is indicated by the following callouts:
To set the keepalive timer for a specific interface, use the keepalive interface configuration command. To turn off keepalives entirely, use the no form of this command.
keepalive [seconds]
seconds | Number of seconds, from 0 to 32767, that defines the keepalive interval. |
10 seconds
Interface configuration
This command does not apply to ATM interfaces. Refer to the atm ilmi-keepalive command for configuration of keepalives on ATM 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 one-second increments down to one second. An interface is declared down after three update intervals pass without receiving a keepalive packet.
You must set the interval as a positive integer that is less than the interval set on the neighboring switch. Setting the keepalive timer to a low value is useful for detecting Ethernet interface failures (transceiver cable disconnecting, cable unterminated, and so on). On a Frame Relay interface, the interval that you enter must be a positive integer that is less than the interval set on the ATM switch. Refer to the frame-relay lmi-n392dte interface configuration command description.
A typical serial line failure involves losing CD. Since this sort of failure is typically noticed within a few milliseconds, adjusting the keepalive timer for faster routing recovery is generally not useful.
The following example shows how to set the keepalive interval to 3 seconds.
Switch(config)# interface ethernet 0 Switch(config-if)# keepalive 3
atm ilmi-keepalive
frame-relay lmi-n392dte
Posted: Thu Feb 17 16:38:40 PST 2000
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