Description: Set keep-alive on an interface.
Syntax: keepalive <timer-value>
timer-value The number of seconds this router waits before sending the next
keepalive message to a peer. Valid values are integers from 0 to 32767.
Description: Keepalive messages check the health of a link. The keepalive timer
is the number of seconds a router waits between sending keepalive messages to a peer.
If no response from the peer is received, the local router retransmits the keepalive
message up to five times. If no response is received from the peer, the local router
brings down the link and withdraws the route from the routing table.
1. Enter into Interface serial 0 Config mode
2. Set keepalive Parameter of interface serial 0 to 15 seconds
3. Type the show Command to see that keepalive parameter of interface serial 0 is set with 15