[c-nsp] Cisco SNMP: Get interface VLAN based on IP address

[Matlock, Kenneth L]

You'll have to do it via 2 snmp calls, but here it is.

First, you need to find the IP in the 'ipNettoMediaNetAddress' table:

snmpwalk -c <community> <switchIP> ipNettoMediaNetAddress | grep <ip
you're searching for>

So if I'm looking for 170.188.71.1, I get the following line:

IP-MIB::ipNetToMediaNetAddress.180.170.188.71.1 = IpAddress:
170.188.71.1
                               ^^^
The interface index is ---------

So once you have the interface index, then you do a 

snmpwalk -c <community> <switchip> ifName.<ifindex>

And in my case, that gives:

IF-MIB::ifName.180 = STRING: Vl71

The 'Vl71' is the name for Vlan 71.

I'll leave it as an exercise to the reader to figure out a script to do
it (my scripts are not anything I'm proud of enough to show the world)
:)


Ken Matlock
Network Analyst
Exempla Healthcare
(303) 467-4671
matlockk at exempla.org


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rudy Setiawan
Sent: Sunday, December 06, 2009 11:19 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Cisco SNMP: Get interface VLAN based on IP address

Hello all,

Is there a way that we can get the interface vlan information based on
IP
address that is attached to that interface vlan via snmp?

Interface Vlan100
ip address 192.168.10.1 255.255.255.0
!

So if I search for 192.168.10.1, I can get the interface vlan?

Thank you

Regards,
Rudy
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