I'm pretty sure they were used for finding connections between
unnumbered interfaces. Now CDP is used for that, if it is enabled.
But it is not always enabled. Even so, if you have a pretty complete
seedfile that contains one address for all of your routers, you can
probably get away without it.
Cordially,
Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
Detroit
"Michael
Seibold" To: <nv-l@tkg.com>
<Michael.Seibo cc:
ld@gek.de> Subject: Re: Antw: [NV-L] NetView
discovery
Sent by: schedule
owner-nv-l@tkg
.com
08/31/01 05:10
AM
Please respond
to IBM NetView
Discussion
As far as I have experienced I haven't seen any problems limiting the
number of route entries discovered. The router interfaces are discovered by
snmp using the interface-table, new devices on connected networks are
discovered by the arp-table. To tell the truth: I admit that I don't even
know what the route entries are used for in netview.... but if someone
knows I would be happy to get informed. Maybe netview uses the route
entries to find the next hop and tries to discover these "hop"-devices
first, befor trying to discover every device found in the arp-tables, to
speed up initial discovery?
Michael Seibold
Gmünder Ersatzkasse GEK
Germany
>>> lesdickert@hotmail.com 30.08.2001 13.58 Uhr >>>
Thanks, Michael, I can stop/start netmon
at night, so I'll give your suggestion a
try.
If I limited the number of route entries
wouldn't this affect what netmon discovers?
I'll have to read up on that.
Les
>From: "Michael Seibold" <Michael.Seibold@gek.de>
>Reply-To: IBM NetView Discussion <nv-l@tkg.com>
>To: <nv-l@tkg.com>
>Subject: Antw: [NV-L] NetView discovery schedule
>Date: Wed, 29 Aug 2001 12:04:38 +0200
>
>Hi Les,
>
>I don't know if you can stop netmon for a view minutes at night, but I can
>(we don't have produktion time at night). So I stop and start netmon at
>3:00 am. After starting, netmon tries to discover the network. Setting the
>configuration polling interval to 1 day ensures that it won't discover
>during the day.
>
>Another possibility is to limit the "Number of Route Entries" in the snmp
>configuration. This will also prevent high cpu usage on the cisco-boxes.
>
>Michael Seibold
>Gmünder Ersatzkasse GEK
>Germany
>
>
> >>> lesdickert@hotmail.com 28.08.2001 17.46 Uhr >>>
>Our Cisco router guys are complaining about
>NetView spiking the CPU on the routers during
>the day with SNMP walks of the IP routing and
>ARP tables.
>
>We don't need to do discovery during the day, so
>does anyone know of a way to turn discovery on/off
>on a schedule. I can do cron and shell scripts and
>the like, just don't see any netmon'ish flags that
>turn discovery on and off.
>
>We could turn discovery on/off manually, but we're
>too lazy to want to do that. Besides, the operations
>staff would probably forget to do it most of the time.
>
>TIA,
>
>Les Dickert
>Verisign Consulting
>
>
>
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