I have 2 routes to a specific destination address and would like to enable object tracking such that when one of the routes is down it will immediately failover to the second route. I realized that the IP SLA monitor 5 is not supported on this IOS version - you need to create a responder instead. My aim is to add both static routes with a metric difference
ip route 1.1.1.1 255.255.255.0 99.99.99.1 track 20
ip route 1.1.1.1 255.255.255.0 88.88.88.1 20
track 20 route 99.99.99.1/32 reachability.
How can i configure the device such that if 99.99.99.1/32 goes down then 88.88.88.1/32 will be used.
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You can achieve same objective by using admin distance with your static toute configuration as below;
p route 1.1.1.1 255.255.255.0 99.99.99.1
ip route 1.1.1.1 255.255.255.0 88.88.88.1 100
Route 99.99.99.1 will be preferable when both are available because of the higher admin dustance for route 88.88.88.1 but 88.88.88.1 will be used when 99.99.99.1 gfoes down.
hopew this helps
Thanks Harbor235 the routes are not within my control therefore i can not run dynamic protocol. I seem to agree with 602650528 on the administrative distance difference, however, my concern is how long it will take for failover to occur and the conditions for failover which is why i want to have some form of tracking and i can determine how long it takes to failover. Has anyone done objecting tracking on cisco 2821 ver 12.4(25b) - if so can some please share a sample config or template? I'll welcome any comments regarding this issue.
Well i want to believe that 99.99.99.1 and 8.88.88.1 are both directly connected next hop. if they are, they routes should disapprear from the route table immediately the next hope goes down since dynamic routing protocols are not involved so no convergence (this is what takes time) are involved in here.
You could test this in a test lab ... e.g gns3
Yeah. If you want to track services then you need a responder where these services are located but for your situation , all you need is to track either interface ip routing or line protocol but it's better to track line protocol
I am assuming 99.99.99.1 and 8.88.88.1 have different exit interface. See the config below;
1. track 20 interface Serial1/0 line-protocol
2. ip route 1.1.1.1 255.255.255.0 99.99.99.1 track 20
3. ip route 1.1.1.1 255.255.255.0 88.88.88.1 20
if what you want to track is ip routing, change line 1 to track 20 interface s1/0 ip routing
But it's better to track line-protocl which encompasses both the layer2 and layer 3 issues. tracking ip routing tracks only layer 3.
hope this helps
Thanks this looks like it.... It looks like the config above is based on the assumption that 99.99.99.1 exits via S1/0? I seem to agree with the line protocol tracking - but i'd like you to clarify that with line protocol tracking if the line is up and route is not available then failover will still take place? Let's assume Router A sends the packet to Router B and the serial connection between Router A and Router B is up but Router B can not reach the destination address (1.1.1.1) would line protocol tracking be sufficient for failover to occur?
>>>>> Sorry our comments seem to have been out of sync by 60secs....... I take it therefore that ip routing shoud be used based on your last comment and my last scenario?
yes pls . use ip routing .... that way if line - protocol is up and there are routing issues it will fail over to 88.88.88.1
>>>>> It looks like the config above is based on the assumption that 99.99.99.1 exits via S1/0?
yes.
I just tested in gns3 and it worked fine.
cheers
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by: harbor235Posted on 2009-08-18 at 09:39:51ID: 25125080
How are you receiving the destination routes? Why not run a dynamic routing protocol?
harbor235 ;}