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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