Stop cron schedule after triggered

[pashtet13]

Hi, hope you can help me here since I am new to EEM.

I wrote a script to monitor SIP trunk status every 5 minutes and if it goes down send me an email. It works good, but if the SIP trunk is down, script will continue to run and I will keep getting alerts every 5 minutes until the issue is resolved.

I was wondering if there is any way to stop the script from running until trunk comes back up. I am assuming I will need to create another script to monitor if SIP registration is up and somehow tie two scripts together so that one disables another. Hope there is a more elegant solution.

Here is my script:

event manager applet SIP_Trunk_Monitor

event timer cron cron-entry "*/5 * * * *"

action 100 cli command "en"

action 200 cli command "show sip-ua register status"

action 250 foreach line "$_cli_result" "\n"

action 300 regexp "4262456285(.*) no " "$line"

action 400 if $_regexp_result eq "1"

action 600 mail server "10.10.10.10" to "email@company.com" from "monitoring@company.com" subject "SIP trunk is DOWN" body "SIP trunk is DOWN on RouterA"

action 700 end

action 800 end

Thanks for your help

[Joe Clarke]

What you could do is when the event is triggered, drop into config mode and set the event for this applet to be "none".  Then, within the same applet, configure a second countdown timer applet that times your hold down period.  When it fires, it drops into config mode, sets the event for SIP_Trunk_Monitor back to a cron timer, and then removes itself.

This is similar to the hold down strategy I discuss in https://supportforums.cisco.com/document/12723951/how-introduce-large-delays-eem-policies .

[pashtet13]

Thanks

Another solution I was thinking about - is there any way to define a global variable "i" (kind of like you did event manager environment q "). Variable will either be i=1 (trunk is up) or i=0 (trunk is down).

Then have two conditions:

1. if trunk is down and variable equals 1 (trunk was UP before) - send alert email that trunk is down and change variable to 0

2. if trunk is up and variable equals 0 (trunk was DOWN before) - send another email that trunk came back up and change var to 1

I think this will be much easier, but I am not sure if we can have such variables in EEM and if we can compare it's value to regex results like this:

action 400  if $_regexp_result eq i

[Joe Clarke]

You can do this with EEM contexts or by configuring an environment variable within your policy.

[pashtet13]

Please take a look at this. Since I don't have a test router and my sip trunk rarely goes down, I don't have a way to test this script. Does it make sense to you?

As I said before, I am new to EEM so you help is really appreciated.

event manager applet SIP_Trunk_Monitor
event timer cron cron-entry "*/5 * * * *"
action 50 set i 1
action 100 cli command "en"
action 200 cli command "show sip-ua register status"
action 250 foreach line "$_cli_result" "\n"
action 300  regexp "4262456285(.*) no " "$line"
action 400  if $_regexp_result eq "1"
action 450   if $i eq "1"
action 600    mail server "10.10.50.223" to "email@company.com" from "email@company.com" subject "RouterA: SIP trunk is DOWN" body "SIP trunk is DOWN on RouterA"
action 601    set i 0
action 602   end
action 603   else
action 650   if $i eq "0"
action 651    mail server "10.10.50.223" to "email@company.com" from "email@company.com" subject "RouterA: SIP trunk is back UP" body "SIP trunk is back UP on RouterA"
action 652    set i 1
action 700   end
action 800  end
action 900 end

[Joe Clarke · Accepted solution]

No, this won't work.  You need to configure (config t) the environment variable that you wish to use to track the trunk status.

[pashtet13]

so are you saying I should use "event manager environment command" and not "action set i 1"? Something like this?

event manager environment i 1

event manager applet SIP_Trunk_Monitor
event timer cron cron-entry "*/5 * * * *"
action 100 cli command "en"
action 200 cli command "show sip-ua register status"
action 250 foreach line "$_cli_result" "\n"
action 300  regexp "4262456285(.*) no " "$line"
action 400  if $_regexp_result eq "1"
action 450   if $i eq "1"
action 500    mail server "10.10.50.223" to "email@company.com" from "email@company.com" subject "RouterA: SIP trunk is DOWN" body "SIP trunk is DOWN on RouterA"
action 600    cli command "conf t"
action 601    cli command "event manager environment i 0"
action 602    cli command "exit"
action 603   end
action 604   else
action 650   if $i eq "0"
action 651    mail server "10.10.50.223" to "email@company.com" from "email@company.com" subject "RouterA: SIP trunk is back UP" body "SIP trunk is back UP on RouterA"
action 652    cli command "conf t"
action 653    cli command "event manager environment i 1"
action 654    cli command "exit"
action 700   end
action 800  end
action 900 end

[Joe Clarke]

Yes, this is correct.  While I would have chosen a variable name that was more descriptive, it should do what you want.

[pashtet13]

I just tested the script and did not get any emails at all (I brought our sip trunk down to test). Have a feeling it's not taking this command:

action 450   if $i eq "1"

what's the best way I can debug this script? I am assuming there is no way to run it line by line and see the output or changes each line makes?

[Joe Clarke]

You can enable "debug event manager action cli" to see the CLI commands being run.

[pashtet13]

Thanks for your help. Looks like the script is working as it should now. I forgot to add one more "end" before:)

[sSiDs]

Hi team! this post is awesome!

But i need your help...

I am newbie to EMM

How change above script ,to send the router to reboot if 1 SIP account is missing in "sh sip-ua register status"

[Joe Clarke]

You should start a new thread for your issue.