nv-l

Re: Tivoli Discovery

2001-11-09 16:37:34
Subject: Re: Tivoli Discovery
From: "Leslie Clark" <lclark AT us.ibm DOT com>
To: nv-l AT lists.tivoli DOT com
Date: Fri, 9 Nov 2001 16:37:34 -0500
To learn more about Todd's suggestions, here is some suggested reading.
If you have not installed the books, you should.

Enabling discovery:

The big switch is under Options...Topology/Status Polling.
for whether or not new node discovery, configuration, and status polling
are done.
These are on by default.
See: man page for nmpolling
See: Admin Guide Chap 6, Monitoring the Network Using Polling

Setting up SNMP
This is done in two places: On the EUI, the Option..SNMP configuration
dialog, and in the file /usr/OV/conf/communityNames.conf

See: Inst&Config Chap 7, Configuring SNMP Values, Configuring Agent
Community Names
See: AdminGuide Chap 6, Configuring SNMP Nodes
See: man page for ovsnmpd.conf
See: online help for Options..SNMP Configuration dialog
See: header in /usr/OV/conf/communityNames.conf


Controlling and completing discovery:

There are two approaches: seedfile, and no seedfile. Only a very small site
would run without a seedfile.

See: Admin Guide Chap 6, Managing Network Configuration, Discovering the
Network
See: Inst&Config Chap 7, Using a Seed File to Customize Discovery
See: online help for netmon daemon configuration
See: man page for netmon


Cordially,

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



                                                                                
       
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bducharme AT avdl DOT com writes:
> Can someone answer me,
>
> How Tivoli Netview do his dicovery in his network ?

Someone more qualified than me is bound to respond, so I'll put up a
strawman.

First, discovery can be limited/directed by the inclusion of a
seedfile.  The server-setup command or menu item, or netmon config
screen in "smitty nv6000" (assuming AIX) specifies the file location.

/usr/OV/conf/netmon.seed is a typical name used in our shop.

>From there, arp caches are the key, starting with your own machine's
arp cache and then those in the seedfile (depending on autodiscovery
settings).

> Pooling or receiving everything ?

Not sure what that means.

> By snmp ?

SNMP is the key.  With autodisvoery turned on, they query the arp
cache portion of MIB-II in those devices and branch out from there. A
common tactic is to put your main routers in the seedile, and discover
out fro mthere.

> By icmp ?

ICMP is used as a precursor to SNMP access attempts, i believe.

> How can we block him from discovering networks from Internet that don't
> belong to us ?

Limiting discovery by appropriate use of the netmon seedfile.  Check
your netview administrator's guide for tips tricks and how-to's on
seedfile setup.

You can also turn off autodiscovery and tell netview only to discover
the things you call out in your seedfile.  You can specify address
ranges to exclude, include, and all sorts of goodies.

--
Todd H.
http://www.toddh.net/
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