change track status via TCL script

[gsabharwal]

I am trying to set the status of tracked object using action_track_set command available in EEM TCL. Relevant configuration from the router is below:

track 203 stub-object

default-state up

!

event manager environment _test_track 200

event manager environment _t_track 203

event manager directory user policy "flash:/tcl"

event manager directory user library "flash:/tcllib"

event manager policy test.tcl type user

The test.tcl script:

::cisco::eem::event_register_track $_test_track state down

namespace import ::cisco::eem::*

namespace import ::cisco::lib::*

action_track_set $_t_track state down

The script is invoked when the track 200 goes down, however I get the error below. Can somebody guide me what I might be doing wrong? Is the syntax of action_track_set not correct?

Oct 18 21:45:36: %TRACKING-5-STATE: 200 rtr 200 reachability Up->Down

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: Bad argument "203"

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: while executing

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: "action_track_set $_t_track state down"

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: invoked from within

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: "$slave eval $Contents"

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: (procedure "eval_script" line 7)

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: invoked from within

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: "eval_script slave $scriptname"

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: invoked from within

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: "if {$security_level == 1} { #untrusted script

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: interp create -safe slave

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: interp share {} stdin slave

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: interp share {} stdout slave

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: ..."

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: (file "tmpsys:/lib/tcl/base.tcl" line 50)

Oct 18 21:45:37: %HA_EM-6-LOG: test.tcl: Tcl policy execute failed: Bad argument "203"

[Joe Clarke]

Your policy generally looks okay. You should not be using variables that being with '_', though. That character is reserved for Cisco variables.

I am unable to reproduce your problem. What version of code are you running?

[gsabharwal]

I am running 12.4(15)T7 Advanced IP services on a Cisco 877.

Thanks

[Joe Clarke]

This code is broken. There doesn't appear to be a bug associated with the fix, but I can confirm it is fixed in 12.4(20)T and higher.

[gsabharwal]

Thanks for the confirmation. Will have to look at using EEM applets to set the status and hope that at least that works. Off the top of my head, I am planning to send a syslog message via the TCL script that will be trigger an applet.

event manager applet SLA_TRACK

event syslog pattern ".*link down.*"

action 1.0 cli command "enable"

action 2.0 track set 203 state down

Do you know of any other way?

[Joe Clarke]

This will not work. Syslogs sent by EEM cannot be intercepted by EEM. You can use a none event detector, and trigger that with the action_policy:

action_policy SLA_TRACK

event manager applet SLA_TRACK

event none

action 1.0 track set 203 state down

[gsabharwal]

Thanks