Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

IP SLA Fail back question

If my ISP were to go offline and the route that I am tracking is removed, is there a way to set a time before it can return to the main line? I know I could simply pull the cable if the line goes down but I am wondering if there is a way to automate it. For example ISP 1 goes down and ISP 2 takes over. Can I say that ISP 1 must be back up for 1 hour before switching back?

5 REPLIES
New Member

Re: IP SLA Fail back question

Yes,

After you create you IP SLA instance you create you track rtr's

under the following

track 1 rtr 1

delay down (seconds) up (seconds)

this should be the value you are looking for.

Bronze

Re: IP SLA Fail back question

What method are you using to track? And are you running any routing protocols? BGP can suppress a route for a specified time period if it goes down then back up.

With object tracking, I believe the maximum abmount of delay you can introduce is 180 seconds.

HTH,

Craig

New Member

Re: IP SLA Fail back question

I am not using any routing protocols and I am using icmp-echo for tracking. I have 2 ISPs and one is pretty much just on standby unless the main goes down. For example

ip sla 1

icmp-echo 4.2.2.2

frequency 3

ip sla schedule 1 start-time now life forever

track 1 rtr 1 reachability

ip route 0.0.0.0 0.0.0.0 1.1.1.1 track 1

ip route 0.0.0.0 0.0.0.0 1.1.1.2 20

So I guess the question is with this config, is there a way to prevent the main from coming back online for a period of time?

Bronze

Re: IP SLA Fail back question

The other poster had the right answer for you:

track 1 rtr 1 reachability

delay down

But it only has a limit of 180 seconds.

HTH,

Craig

New Member

Re: IP SLA Fail back question

Yes,

as previously posted

Taking your example

ip sla 1

icmp-echo 4.2.2.2

frequency 3

ip sla schedule 1 start-time now life forever

track 1 rtr 1 reachability

delay down (seconds) up (seconds)

As mentions only up to 180 seconds

871
Views
5
Helpful
5
Replies