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Using SLA monitor (tracking)

Posted on 2008-10-21
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Last Modified: 2012-05-05
Hello,

I have an situation where we use a satellite link and wireless link for internet access.
The scenario includes a "ship". When the ship is out at the see than it uses a satellite modem for internet access, and once the ship is near the land and gets the "wireless" signals it switch over to Wireless.

We have configured it via OSPF, so this part is working just fine. But what causes a problem is:
When the ship is comming near the land, there is some small islands between the ship and the land, so it have a signals for wireless but they are not that good, so what happens when the radio gets the signals the OSPF switch the route on Wireless so about couple seconds the signals are gone and the OSPF does not switch back once that happens, and in this time the ship is without the internet access, because of bad signals which are going up-down while the ship is passing between the small islands.

So what I need is SLA tracking on the router, I have an example below which I am planning to use, but I am not sure is this a solution. I think I need the configuration which will "ping" wireless for maybe 5 minutes and if the ping response is OK, than it need to switch over on wireless and not before. Than I`ll be sure that signals are good all the time.

Tha config I should use is below:
Best regards
 
interface ethernet 0
 description primary-link
 ip address 10.1.1.1 255.0.0.0
!
interface ethernet 1
 description backup-link
 ip address 10.2.2.2 255.0.0.0
!
ip sla monitor 1
 type echo protocol ipIcmpEcho 172.16.23.7
 timeout 1000
 frequency 3
 threshold 2
!
ip sla monitor schedule 1 life forever start-time now
!
track 123 rtr 1 reachability
!
access list 101 permit icmp any host 172.16.23.7 echo
!
route map MY-LOCAL-POLICY permit 10
 match ip address 101
 set ip next-hop 10.1.1.242
 set interface null 0
!
ip local policy route-map MY-LOCAL-POLICY
ip route 0.0.0.0 0.0.0.0 10.1.1.242 track 123
ip route 0.0.0.0 0.0.0.0 10.2.2.125 254

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Question by:FalconQ
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btassure earned 500 total points
ID: 22766782
That should work but getting it so that it won't switch routes until it has 5 minutes of stable connection won't be easy.
The route switching should be very fast so as soon as the SLA is met it will kick over to the backup. It ought to be a lot faster than the OSPF changeover.
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by:FalconQ
ID: 22767099
that`s why I am not so sure.... to use this config, any suggestions ? I did some research but no luck..
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