December 2001
Intermediate to advanced
608 pages
25h 14m
English
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Name
keepalive — interface
Synopsis
keepalive seconds
no keepaliveConfigures
The keepalive interval
Default
10 seconds
Description
The keepalive command specifies the interval (in
seconds) that the router waits before
sending a message on the interface to test the link and determine
whether it is up or down. On Ethernet interfaces, the router sends
the message to itself. On serial interfaces, the message is sent to
the router on the other end of the link.
Keepalive settings can be very sensitive. If the keepalive interval is too low, the keepalive packets might be delayed by other traffic. If the interval is set too high, the router will take longer to update the interface’s status, which slows route convergence.
On Frame Relay interfaces, the keepalive value should match (or be less than) the LMI interval configured on the carrier’s switch.
Example
interface ethernet 1
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