Junos OS

Brilliant! The script works like a treat. Thank you for your help.

Regards,

Richard

Hello, I'm writng some Perl code to download the current ARP table for a specific interface via the JUNOS Perl Module. The required operational command is "get-arp-table-information", however you cannot specify a specific interface and I'm reluctant to download thousands of ARP entries from the router and then grep the result in code.

Is it possible to apply a 'match' or 'grep' at the time the operational command is run ie equivalent to the cli option of:

>show arp | match ge-0/0/1.20

Many thanks,

Richard McCarthy

NEC Australia

Generally speaking, pipes do not work from scripts.  You could always try:

<command>show arp | match ge-0/0/1.20</command> but I don't expect it to work.

As an alternative, you could install an op script locally on the Junos device that filtered out the arp results for you.  This op script could be called via the <op-script> API element:

http://www.juniper.net/techpubs/software/junos/junos93/junos-xml-ref-oper/html/summary-oper-request510.html#1786729

Hello and thankyou for your reply. I have tried your suggestion and written a simple opscript and then called it from the Perl API. It works ok, but  notice that the perl call only returns the first line of the op script output? ie if I return multiple lines of arp entries with carriage returns, the other lines past the first line are not returned into the perl module.

Any ideas?

Could you post the op script you are using?

Hi, here is the initial script that I've got running. Each MAC address is printed out on a separate line (as you would expect). Can you concatentate the MAC addresses instead using comma separation?

version 1.0;
ns junos = "http://xml.juniper.net/junos/*/junos";
ns xnm = "http://xml.juniper.net/xnm/1.1/xnm";
ns jcs = "http://xml.juniper.net/junos/commit-scripts/1.0";
import "../import/junos.xsl";

var $arguments = {
 <argument> {
  <name> "interface";
  <description> "Interface name";
 }
}

param $interface;

match / {
 <op-script-results> {
  if ($interface) {
   var $rpc = {
    <get-arp-table-information> {
     <expiration-time>;
    }
   }
   var $out = jcs:invoke($rpc);
   if ($out//xnm:error) {
    copy-of $out//xnm:error;
   }
   for-each ($out/arp-table-entry[interface-name = $interface]) {
    <output> ./mac-address;
   }
  }
 }
}

Try the following:

<output> {

    for-each ($out/arp-table-entry[interface-name = $interface]) {
        expr ./mac-address;

        if( position() != last() ) {

            expr ",";

        }

    }

}