Auto DHCP renew when tracking change state

[slauzon]

I looking to find a way to do a shut and no shut until the tracking change state. For spoke router using a DHCP connection to the Internet. When there is a problem with the connection, the modem will give a private ip adresse and by just doing a shut and then a no shut it fix the issue but I would like to do it automaticaly. I have already tried with a event manager applet but when the tracking change state it will execute only the commands only once but I would like it to do it every 10 minutes until the tracking change state again. Maybe with tcl script but don't realy know where to start.

[Joe Clarke]

This may be doable with applets.  What version of IOS do you have?

[slauzon]

We use mostly c181x-advipservicesk9-mz.124-15

The only problem I am facing at the moment is that when the tracking state change, it only execute the shut and no shut once but it should do it every X minutes until the tracking state change back. I have tried to change the event with crontab but it doesn't seem to work.

[Joe Clarke · Accepted solution]

You can do what you want using three applets (two top-level applets, and one nested applet).

event manager environment quote "
event manager applet track-down
 event track 1 state down
 action 001 cli command "enable"
 action 002 cli command "config t"
 action 003 cli command "event manager applet track-timer"
 action 004 cli command "event timer watchdog time 180 name track_timer"
 action 005 cli command "action 1.0 cli command enable"
 action 006 cli command "action 2.0 cli command $quote config t$quote"
 action 007 cli command "action 3.0 cli command $quote interface Fa0/0$quote"
 action 008 cli command "action 4.0 cli command shut"
 action 009 cli command "action 5.0 cli command $quote no shut$quote"
 action 010 cli command "action 6.0 cli command end"
event manager applet track-up
 event track 1 state up
 action 1.0 cli command "enable"
 action 2.0 cli command "config t"
 action 3.0 cli command "no event manager applet track-timer"
 action 4.0 cli command "end"

The above config will periodically shut/no shut interface Fa0/0 every three minutes until the tracked object comes back up.

[slauzon]

This is exacly what I was trying to do but I didn't know I could use environnement variables. Thank you so much, it will solve me alot of headache.