Backup Link will remain active for some time...plz...help...

[harsha senaratna]

hi all ,

According to my given scenario (attached) backup link will become (cellular) active once the main link goes down.
But My requiement is to backup link must remain active for some time (5 minutes) eventhough the main link comes up
again.This should prevent the link flapping.

please provide me a way to achive this. Your replies using expertise knowledge highly appriciate.

Thanks

[smitesh kharecha]

Hi Harsha,

Can you provide sanitise config...

HTH,

Smitesh

[harsha senaratna]

hi ,

here are my current configuration.

cellular 0/0/0 gsm profile create 1 *******
chat-script gsm "" "***** " TIMEOUT 30 "CONNECT"

interface FastEthernet0/1
  ip address 172.1.1.1 255.255.255.0

int se 0/1/0

ip address 192.168.1.2 255.255.255.252

interface Cellular0/1/0
ip address negotiated
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer in-band
dialer idle-timeout 30 either
dialer string gsm
dialer-group 1
async mode interactive
ppp chap hostname *****
ppp chap password 7 ********
ppp ipcp dns request

ip route 0.0.0.0 0.0.0.0 serial 0/1/0 track 1
ip route 0.0.0.0 0.0.0.0 Cellular0/1/0 10

ip sla 1
icmp-echo 192.168.1.1
frequency 10
ip sla schedule 1 life forever start-time now

track 1 ip sla 1 reachability

access-list 1 permit any
dialer-list 1 protocol ip list 1

line 0/0/0
script dialer gsm

[smitesh kharecha]

Hi Harsha,

Under track command, there is delay option where you can provide delay upto 180 seconds ( might be more in newer IOS)...

HTH,

Smitesh

PS: Please rate if helpful....

[harsha senaratna]

hi smitesh,

Thanks for your reply.I found some configurations.

     track 1 ip sla 1 reachability
       delay down 10 up 180

using this once the sla goes down it will remain 10 seconds for the notiying the router as sla down. Once it come back up again it will remain 180 seconds to notifying the router sla up again.

Am I correct ? I think using this I can mitigate the link flapping.

Thanks

[smitesh kharecha · Accepted solution]

Hi Harsha,

You got it perfect...

It will simply delay track status to go UP ( for 180 seconds) and go DOWN ( for 10 seconds).

HTH,

Smitesh

PS: Please rate helpful posts...

[harsha senaratna]

hi smitesh,

I found the solution for me. This work for me.

          track 1 ip sla 1 reachability

                 delay down 10 up 180

Thanks for you reply.