EEM Script to Generate Show Tech & Auto Reboot a router

While working through my CSR1000v stability woes, I had the need to automatically generate a “show tech” and then reboot a router after an IP SLA failure was detected.  It seemed fairly easy but I could never get the show tech fully completed before the EMM script would stop running, and the reboot command never worked either.

Posting on Reddit paid off as user caught the problem: EEM scripts by default can only run for 20 seconds.  Since a “show tech” can take longer than this, the subsequent steps may never be processed.  The solution is increase the runtime to say 60 seconds to guarantee the show tech completes:

! Create and run IP SLA monitor to ping default gateway every 5 seconds
ip sla 1
 icmp-echo source-interface GigabitEthernet1
 threshold 50
 timeout 250
 frequency 5
ip sla schedule 1 life forever start-time now
! Create track object that will mark down after 3 failures
track 1 ip sla 1
 delay down 15 up 30
! Create EMM script to take action when track state is down
event manager session cli username "ec2-user"
event manager applet GatewayDown authorization bypass
 event track 1 state down maxrun 60
  action 100 cli command "en"
  action 101 cli command "term len 0"
  action 110 syslog priority notifications msg "Interface Gi1 stopped passing traffic. Generating diag info"
  action 300 cli command "delete /force bootflash:sh_tech.txt"
  action 350 cli command "show tech-support | redirect bootflash:sh_tech.txt"
  action 400 syslog priority alerts msg "Show tech completed. Rebooting now!"
  action 450 wait 5
  action 500 reload

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