[c-nsp] SLA route tracking

[Sergey Voropaev]

Thank you very match. Your answer is very helpfull and I'm going to check
your solution soon. As for IOS - I can install any newest for this purporse.

On 18 January 2011 21:35, Peter Rathlev <peter at rathlev.dk> wrote:

> On Tue, 2011-01-18 at 20:26 +0300, Sergey Voropaev wrote:
> > We have following config on the 3750 switch.
> >
> > track 10 rtr 10 reachibility
> > !
> > ip route 1.1.1.2 255.255.255.255 vlan10 1.1.1.2 track 10
> > !
> > ip sla 10
> >  tcp-connect 1.1.1.2 33333 source-ip 1.1.1.1 source-port 433
> > !
> >
> > The main disadvantage of such config is that route removed from
> > routing table in case of ONE TCP timeout. In this case false alarm
> > occurs. Is it possible using 3750 platfirm remove route fo THREE
> > CONSEQUINTIVE TCP timout?
>
> You could use the "delay down" command on the track object, like this:
>
> ip sla 10
>  tcp-connect 10.20.30.40 22 control disable
>  timeout 5000
>  frequency 10
> !
> ip sla schedule 10 life forever start-time now
> !
> track 10 ip sla 10
>  delay down 25
> !
>
> The SLA object probes every 10 seconds, but the track object only goes
> down 25 seconds later (2,5 timers SLA frequency here). So if the SLA
> object misses one or two probes and then regains connectivity, the track
> will never go down.
>
> I tried this on 12.2(55)SE IP Base; since you didn't specify your IOS
> version I can't say if it's supported there. This was also on a C3560G,
> but I can't imagine they're different in that aspect.
>
> --
> Peter
>
>
>