automate show command

mikegrous · ‎03-16-2009

So we have a very strange connectivity issue. To troubleshoot down i would like to have the outputs of "show arp" and the output of "show mac-address-table" before and after this connectivity issue happens. The connectivity issue doesnt last long so it is hard to get into the 2 core L3 switches and get this info in a quick enough time. Is there a way to automate this process so say the switch will send the output of those to commands to a tftp server or a syslog etc every say 10 minutes or something

Giuseppe Larosa · ‎03-16-2009

Hello Mike,

you need to use a specialized scripting language like TCL/TK with Expect that allows to automate login to device to send commands and to get output back.

see

http://www.activestate.com/activetcl/

http://expect.nist.gov/

Hope to help

Giuseppe

mattkaya56 · ‎03-16-2009

Hello Mike,

Check this out - I used this.

http://blog.ioshints.info/2007/08/example-tcl-script-with-command-line.html

Mat

eborcher · ‎03-16-2009

You could try to automate this with an EEM Applet. Show arp and show mac-address-table are executed every 10 minutes with the below script and the output is stored in your log buffer of your router. If you have syslog server setup then that output can be exported.

However, the caveat is that your log buffer might get filled quickly.

event manager applet test

event timer watchdog time 600

action 1.0 cli command "show arp"

action 2.0 syslog msg "$_cli_result"

action 3.0 cli command "show mac-address-table"

action 4.0 syslog msg "$_cli_result"

mikegrous · ‎03-17-2009

Thanks guys. I will give your ideas a shot when i have some time.