topic Re: Perlscript to connect hp switch and read the mac-address in Switches, Hubs, and Modems

Perlscript to connect hp switch and read the mac-address

Christian Czech — Mon, 13 Oct 2008 05:00:50 GMT

Hi,
I need a perlscript to connect my hp procurve switch and read the mac-address from the connected hosts.
Can someone help me with an example?
Thanks Christian

Re: Perlscript to connect hp switch and read the mac-address

cenk sasmaztin — Mon, 13 Oct 2008 08:39:29 GMT

what you say ??
if I true understand you
you want look pc mac address each port on switch
is this true ?

Re: Perlscript to connect hp switch and read the mac-address

Igoris_1 — Mon, 13 Oct 2008 09:11:41 GMT

how do you want to connect, I believe SNMP is the easiest way to retrieve MAC addresses.

Re: Perlscript to connect hp switch and read the mac-address

Christian Czech — Mon, 13 Oct 2008 10:47:33 GMT

Hi,
with snmp there is no way to find out a matching witch mac-address connect on which port on the switch. (like the command show mac-address vlan 1)

;-)) I know my english is not good.

Re: Perlscript to connect hp switch and read the mac-address

Matt Hobbs — Mon, 13 Oct 2008 12:13:41 GMT

There are scripts out there.... I haven't tried it but I found this - http://linux.softpedia.com/get/Programming/Libraries/SNMP-BridgeQuery-26173.shtml

Re: Perlscript to connect hp switch and read the mac-address

Christian Czech — Mon, 13 Oct 2008 17:46:11 GMT

Hi,
sorry the script do not work.

#!/usr/bin/perl

my $address = "x.x.x.x";
my $community = "public";
use SNMP::BridgeQuery;
use SNMP::BridgeQuery qw(querymacs queryports queryat);

my $fdb = queryfdb(host => $address,
comm => $community);
unless (exists $fdb->{error}) {
($fdb->{$mac} = "n/a") unless (exists $fdb->{$mac});
print "This MAC address was found on port: ".$fdb->{$mac}."\n";
}
~

Output:

/test.pl
This MAC address was found on port: n/a

But I do not why. The mac addresses are in the snmp parameter (with a snmpwalk).
It is very mysteries.

Re: Perlscript to connect hp switch and read the mac-address

André Beck — Tue, 14 Oct 2008 19:04:04 GMT

Hi Christian,

given that NeDi (www.nedi.ch) can do exactly that (correlate host MAC addresses to switch ports on ProCurve boxes), the information has to be there in the SNMP MIBs. The discovery module is even a perl script, so you might have a look into it for how it's done.

HTH,
Andre.