[c-nsp] Scratching the surface of SNMP

[Charlie Greenaway]

Peter,

With regards to point 1.  I'm sure that there is a better way of doing this but here is a hack to achieve the same result.
Cross reference the ARP table, IfTable and IP Table.  From these you will be able to eliminate the locally configured IP addresses and MAC addresses (the intersection of ARP and IP tables).  Whatever is left in the ARP table is what is connected to the interface (intersect with remainder of ARP table and IF table).

Clearly, if there are devices that are bridging only, they will not appear.

Please do keep me posted on how you get on.  I'm going to be writing some MPLS/VRF-Lite based tools soon.

Best regards,

Charlie G

Charlie Greenaway - CCIE#11226 (Security/R&S)

Solutions Architect | BT iNet | Tel: +44 (0)1993 885897 
Email: charlie.greenaway at btinet.bt.com | Web: www.btinet.bt.com 

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Date: Sun, 25 Oct 2009 21:14:15 +0000
From: Peter Hicks <peter.hicks at poggs.co.uk>
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Scratching the surface of SNMP
Message-ID: <4AE4BFA7.10608 at poggs.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

All,

I am writing an NMS and coming unstuck on a few things:

  * Determining which devices are on a port on a device that doesn't 
support BRIDGE-MIB::dot1dTpFdbTable, e.g. Cisco 1801 or 877W

  * Listing the VRFs and RDs configured on a router, and which 
interfaces are a member of which VRF

  * Finding out which VLANs are configured on a device, and which are 
tagged on a port

Can anyone help me out with their experiences, or in the direction of a 
forum more suitable?

Regards,


Peter


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