Receiver Router (R5):
+++++++
Ip sla responder frame-relay all
R5(config)#do sho ip sla respo
IP SLAs Responder is: Disabled
Frame Relay Responder:
Enabled on every Interface and DLCI
Sender router (R4):
++++++
Ip sla 1
frame-relay interface serial0/0 dlci405
timeout 100
frequency 1
Ip sla schedule 1 start-time now
R4#sho ip sla statistics
Round Trip Time (RTT) for Index 1
Latest RTT: 16 milliseconds
Latest operation start time: *16:40:48.496 UTC Sat Jun 30 2007
Latest operation return code: OK
Number of successes: 454
Number of failures: 0
Operation time to live: 3107 sec
Then, tied it to a track:
R4(config)#track 1 rtr 1 state
R4(config-track)#do sho track 1
Track 1
Response Time Reporter 1 state
State is Up
6 changes, last change 00:00:09
Latest operation return code: OK
Latest RTT (millisecs) 16