It's a bit messy, but yes. Snmp plus scripting of some sort.
You can pull the mac table entries from the Catalyst via snmp and pull the
arp table from the router via snmp.
The Catalyst has the mac addresses unfortunately spread around. The router
has them all nicely together.
You have to cut & sed all over the place to clean up the snmp responses well
enough to use them. That's where it gets a little messy.
Chris Davis
-----Original Message-----
From: Joe Lin [mailto:jlin@doradosoftware.com]
Sent: Tuesday, May 21, 2002 4:39 PM
To: 'Chris Davis'; cisco-nsp@puck.nether.net
Subject: RE: [nsp] Catalyst arp table
Can this be done via snmp?
-----Original Message-----
From: Chris Davis [mailto:chris.davis@computerjobs.com]
Sent: Tuesday, May 21, 2002 8:01 AM
To: cisco-nsp@puck.nether.net
Subject: RE: [nsp] Catalyst arp table
The switch ARP table is only going to show you IPs in use on the
management
vlan for the switch.
What you probably want from the switch is the mac table. show mac.
Join the mac table from the switch with the arp table from your router
to
associate the mac addresses from your switch with the IP addresses on
your
network.
-----Original Message-----
From: Andrey Koklin [mailto:aka@veco.ru]
Sent: Tuesday, May 21, 2002 10:25 AM
To: cisco-nsp@puck.nether.net
Subject: [nsp] Catalyst arp table
Is there a way with Catalysts 2900XL/3500XL to maintain IP ARP table?
I find it almost empty, "show arp" displays only several service
records,
like IP address of DNS server, and seems quite useless.
I need it for my statistics/diagnostics software. Partially, I can get
such information from router, but it looks as indirect and incomplete
method.
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