Re: [nv-l] CDP and Discovery

2002-08-01 21:56:56
Subject: Re: [nv-l] CDP and Discovery
From: "Leslie Clark" <lclark AT us.ibm DOT com>
To: nv-l AT lists.tivoli DOT com
Date: Thu, 1 Aug 2002 21:56:56 -0400
Assuming that your exclusions don't exclude them, my guess is that
they would also show up if you ping them. That's often the case with
hubs and switches.  My understanding is that there is little or no IP
traffic over them, so they are not in anyone's arp cache, so they
don't get investigated and added. Pinging them makes noise so
they get added. Same with the seedfile approach. I have never
been patient enough to wait and always end up making a list
of expected addresses and pinging them or putting them in
the seedfile if they don't show up pretty quickly.

The CDP, as I understand it, is primarily used in the discovery
of unnumbered networks. I may be wrong about that. If you look
in netmon.trace you may see messags about 'unresolved next
hop so-and-so being ingnored'. Those might be clues.


Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking

                      Raymond"                 To:       "NV List (E-mail)" 
<nv-l AT lists.tivoli DOT com>                                 
                      <[email protected]        cc:                              
                      om>                      Subject:  [nv-l] CDP and 
                      08/01/2002 01:04                                          

Hello Everyone.

NetView 7.1.1 or 7.1.2 on AIX 4.3.3 ML10

I have noticed a problem with discovery on two NetView servers. NetView
fails to add Cisco switches, for example 2924 or 2950, to the map. The
routers on the same network are on the map, are managed and are demand
polled every 24 hours. If I telnet to the router(s) and enter the command,
"show cdp neighbor", the switches are listed by their configured hostname
which may or may not be the DNS name. The demand poll shows NV is querying
the CDP cache.

netmon options are:
             /usr/OV/bin/netmon -P -S -s/usr/OV/conf/netmon.seed -A -u -l
-K0 -q
32 -Q 32

My seed file only contains exclusions, HSRP and SNMP status poll entries.
other words, I do not have IP network ranges like 10.10.*.* in the seed
file. If I add the switch IP address to the netmon.seed file and run the
netmonaction.sh script, the switches are soon added to the map.

Any ideas?

Ray Westphal
Enterprise Rent-A-Car

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