Error with Service Diagnostics - BGP EEM

john-farag · ‎06-18-2013

Hello,

I am trying to implement the BGP Service Diagnostics TCL scripts found at: https://supportforums.cisco.com/docs/DOC-19393

Specfically, I want to receive syslog and/or email notifications when a BGP neighbor goes down.

I am following the guide located at:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6555/ps9424/white_paper_cisco_ios_service_design_bgp_osp_qos.html

I am performing the manual implementation (no EMM), and get to the point of setting the variables like so:

tclsh flash:/svc-diag/sdiag_bgp.tcl bgp_neighbor_loss.tcl syslog FALSE FALSE flash:/svc-diag flash:/user_library

When I test the script by pulling the interface, and therefore losing the BGP adjacency, I get the following syslog messages:

*Jun 18 13:02:01.846: %BGP-5-ADJCHANGE: neighbor X.X.X.X Down Interface flap

*Jun 18 13:02:02.182: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: invalid command name "exec_show_commands"

*Jun 18 13:02:02.182: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: while executing

*Jun 18 13:02:02.182: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: "exec_show_commands "show ip bgp neighbor $ip_address | i Last reset""

*Jun 18 13:02:02.182: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: invoked from within

*Jun 18 13:02:02.182: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: "$slave eval $Contents"

*Jun 18 13:02:02.182: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: (procedure "eval_script" line 7)

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: invoked from within

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: "eval_script slave $scriptname"

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: invoked from within

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: "if {$security_l

BGP-LAB-INTERNevel == 1} { #untrusted script

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: interp create -safe slave

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: interp share {} stdin slave

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: interp share {} stdout slave

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: ..."

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: (file "system:/lib/tcl/base.tcl" line 50)

*Jun 18 13:02:02.186: %HA_EM-6-LOG: bgp_neighbor_loss.tcl: Tcl policy execute failed: invalid command name "exec_show_commands"ET_GW(config-if)#

Here is the output of of show flash:

BGP-LAB-INTERNET_GW#sh flash:
-#- --length-- -----date/time------ path
1            0 Jun 13 2013 18:46:58 +00:00 user_library
2          131 Jun 13 2013 18:52:06 +00:00 user_library/email_template
3        16441 Jun 13 2013 18:52:14 +00:00 user_library/userlib.tcl
4         8533 Jun 13 2013 18:52:32 +00:00 user_library/diag_lib.tcl
5         4280 Jun 13 2013 18:52:40 +00:00 user_library/sdiag_lib.tcl
6         1713 Jun 13 2013 18:52:50 +00:00 user_library/bgp_lib.tcl
7         2959 Jun 13 2013 18:52:56 +00:00 user_library/tclIndex
8        13484 Jun 13 2013 18:53:06 +00:00 user_library/lib.tcl
9          131 Jun 13 2013 18:51:46 +00:00 copy
10    36720544 Jun 3 2013 16:09:14 +00:00 c3825-advipservicesk9-mz.124-13.bin
11           0 Jun 13 2013 15:48:48 +00:00 svc-diag
12       16331 Jun 13 2013 18:41:58 +00:00 svc-diag/sdiag_bgp.tcl
13       10110 Jun 13 2013 18:42:44 +00:00 svc-diag/bgp_neighbor_loss.tcl
14       22425 Jun 13 2013 18:42:54 +00:00 svc-diag/bgp_neighbor_formation.tcl
15       20987 Jun 13 2013 18:43:06 +00:00 svc-diag/bgp_neighbor_route.tcl
16        5900 Jun 13 2013 18:43:42 +00:00 svc-diag/sdiag_bgp_display.tcl
17       10741 Jun 13 2013 18:44:40 +00:00 svc-diag/sdiag_bgp_undeploy.tcl
18        6085 Jun 13 2013 18:44:58 +00:00 svc-diag/collectEmailParameters.tcl

27103232 bytes available (36909056 bytes used)

Any assistance would be appreciated.

Thanks!

Joe Clarke · ‎06-18-2013

In config mode, try:

no event manager directory user library flash:/user_library

event manager directory user library flash:/user_library

Then see if the policy will work.

john-farag · ‎06-19-2013

Joseph,

The above commands didn't seem to do the trick. Still receiving the "invalid command name "exec_show_commands"" error.

Thanks.

Joe Clarke · ‎07-01-2013

Copy this code into bgp_neighbor_loss.tcl. I think they forgot to either include the library or add the function:

source "sdiag_lib.tcl"

If that doesn't work, add this code to bgp_neighbor_loss.tcl:

proc exec_show_commands {command} {
    global errorInfo
    if [catch {cli_open} result] {
        error $result $errorInfo
    } else {
        array set cli1 $result
    }
    if [catch {cli_exec $cli1(fd) "enable"} result] {
        error $result $errorInfo
    }
    if [catch {cli_exec $cli1(fd) $command} result] {
        error $result $errorInfo
    } else {
        set show_command_output $result
    }
    if [catch {cli_close $cli1(fd) $cli1(tty_id)} result] {
        error $result $errorInfo
    }
    return $show_command_output
}

Jerome Tissieres · ‎07-03-2013

Sorry but to receive a syslog when a BGP session goes down you do not need EEM. Normal logging is enough:

!

router bgp 1234

bgp log-neighbor-changes

!

logging host x.x.x.x

Best Rgds,

Jerome