IP SLA Tracking with Configuration Example
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Revision as of 01:03, 24 June 2010
<ip sla 1 < The number 1 here is arbitrary, used only to identify this sla. It is otherwise known as the operation number>
icmp-echo 18.104.22.168 < 22.214.171.124 is a DNS server that responds to pings out on the internet>
timeout 500 < This is how long to wait for a response from the ping>
frequency 3 < This is the repeat rate for the SLA>
ip sla schedule 1 start-time now life forever < This command says "start SLA 1 now and keep it running forever>
track 1 rtr 1 reachability < This comand creates the track object "1" and monitors the SLA 1>
now for the routing, we need to change the default route and associate it with the tracker
no ip route 0.0.0.0 0.0.0.0 126.96.36.199
and then put it back with the tracking
ip route 0.0.0.0 0.0.0.0 188.8.131.52 track 1
Then we need to add our secondary route
ip route 0.0.0.0 0.0.0.0 184.108.40.206 10 <we set this route with a higher metric than the tracked route>
ip route 220.127.116.11 255.255.255.255 18.104.22.168 ==> 22.214.171.124 being your primary next hop ip address
Now when the ping to 126.96.36.199 fails the primary route is removed and the secondary route with the higher metric becomes the default.
The route will be reinstated when the connectivity is restored.
Related show Commands
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