[c-nsp] EEM applets and conditional statements

[Ivan Pepelnjak]

You can do it with EEM 3.0 (12.4(22)T if I'm not mistaken). Unfortunately I
haven't been writing about this feature yet, but here's a sample applet that
compares DHCP-acquired address to the previously-acquired one, maybe it will
come handy:

event manager applet DetectDHCPChange 
 event syslog pattern "DHCP-6-ADDRESS_ASSIGN"
 action 1.0 regexp "Interface (.*) assigned DHCP address ([0-9.]+)"
"$_syslog_msg" match interface ipaddress
 action 2.0 context retrieve key DHCP_address variable "addr"
 action 2.3 set oldip "$addr"
 action 2.4 set addr "$ipaddress"
 action 2.5 context save key DHCP_address variable "addr"
 action 8.0 if $ipaddress ne $oldip
 action 9.1  info type routername
 action 9.2  mail server "$_mail_smtp" to "$_mail_rcpt" from
"$_info_routername@$_mail_domain" subject "DHCP address on $interface
changed to $ipaddress" body "\n$_syslog_msg"
 action 9.3  syslog msg "address changed to $ipaddress, e-mail sent to the
operator"
 action 9.4 else
 action 9.5  syslog msg "DHCP address on $interface still $ipaddress"
 action 9.9 end
!
event manager applet SetDHCPKey 
 event syslog pattern "SYS-5-RESTART"
 action 1.0 set addr ""
 action 1.1 context save key DHCP_address variable "addr"  

This article has a sample applet that uses command output (in $_cli_result
variable)

http://wiki.nil.com/Send_a_list_of_high-CPU_processes_on_CPU_overload

Hope this helps
Ivan
 
http://www.ioshints.info/about
http://blog.ioshints.info/

> -----Original Message-----
> From: Rodney Dunn [mailto:rodunn at cisco.com] 
> Sent: Wednesday, August 12, 2009 4:04 AM
> To: Justin Shore
> Cc: 'Cisco-nsp'
> Subject: Re: [c-nsp] EEM applets and conditional statements
> 
> I don't think you can do it with an EEM applet to compare 
> data in the output. I think you need to do it via a TCL 
> script where you can save the variables.
> 
> Rodney
> 
> 
> 
> Justin Shore wrote:
> > I'm having trouble figuring out how to use the conditional 
> > capabilities of EEM applets to do something fairly simple.  
> I'd like 
> > to check for DHCP conflicts on a schedule and if any exist 
> I'd like to 
> > generate a syslog message and send an email.  What I can't 
> figure out 
> > how to do is parse the output of 'sh ip dh con' and if then 
> perform an 
> > action if there are any conflicts (ie, more than just the single 
> > header line in the output).  I've gone through some of the EEM 
> > community scripts but they all seem to be full blown TCL 
> scripts.  I'm 
> > thinking that I can handle this with a simple applet.  The applets 
> > have if, for, and while capabilities but I haven't figured 
> out how to 
> > apply them to parsing command output?
> > 
> > Any suggestions or pointers?  Example scripts that 
> demonstrate how to 
> > use the EEM logic capabilities would be fine too.  I can build off 
> > that to do what I need.
> > 
> > Thanks
> >  Justin
> > 
> > 
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>