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Auto DHCP renew when tracking change state

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.

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Cisco Employee

Re: Auto DHCP renew when tracking change state

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.

4 REPLIES
Cisco Employee

Re: Auto DHCP renew when tracking change state

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

New Member

Re: Auto DHCP renew when tracking change state

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.

Cisco Employee

Re: Auto DHCP renew when tracking change state

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.

New Member

Re: Auto DHCP renew when tracking change state

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.

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