From: W. Alan Robertson (warobertson@xxxxxxxxxxxxx)
Date: Fri Jun 01 2001 - 21:07:16 GMT-3
Well, for starters, OpenView will never send a trap anywhere (That is,
unless there's another SNMP server that's actually managing your
OpenView platform, which is doubtful).
A 'trap' is an event notification that is generated by the router (Or
any device that is running an SNMP Agent), and sent to the configured
SNMP management station(s). The kinds of events which generate a trap
can vary... On Cisco equipment, we have a number of different
categories to choose from: Environmentals, Configuration, Interfaces,
Frame-relay... Bunches and bunches.
Most IP services have reserved port numbers for both TCP and UDP...
That's just common practice. Very few use them both. There's no case
that I'm aware of when SNMP utilizes TCP communiations.
I'm not sure what you mean by "What additional traffic is added with
"snmp-server host" command?" Generally speaking, SNMP is a fairly
low-bandwidth application (moreso because it relies on UDP, rather
than the additional overhead of establishing a TCP connection). This
can vary, of course, with the polling interval, the number of stations
being monitored, and the number of trap destinations for each
montiored device.
Finally, this is a list for people gearing up for the CCIE lab exam.
It's not the place to be asking random questions about arbitrary
TCP/IP applications... You could probably have gotten every single
one of these questions answered very easily had you looked in the
right place, namely a USENET group archive dedicated to either SNMP of
OpenView. You could also look at some of the SNMP related RFCs, which
also could have answered most of these. Finally, the way that you
asked just plain sucks:
> If someone has _complete_ information (not partial)
> that you are 100% sure of could you please share it
> with me.
When asking for information of people, free of charge, you get what
they are willing to give you. If you get any at all, particularly
when asked in the completely wrong venue, you ought to consider
yourself damn lucky.
Alan
----- Original Message -----
From: "Roman Rodichev" <rodic000@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Friday, June 01, 2001 7:03 PM
Subject: SNMP
> Hello everyone,
>
> this is one of the topics that I still can't find _complete_
information on.
> If someone has _complete_ information (not partial) that you are
100% sure
> of could you please share it with me. I need to know exactly the
> source/destination udp/tcp ports and types of communication
(REQUEST,
> RESPONSE, INFORM, TRAP) for SNMP traffic between a network device
configured
> with "snmp-server community" and "snmp-server host" commands and an
HPOV
> server (or other management station). I need to know what devices
use
> 161,162 UDP/TCP and in what situations. Here is what my
understanding:
>
> HPOV will send REQUEST to Router's UDP161
> Router will send RESPONSE from port UDP161
> HPOV will send a TRAP to Router's UDP162
>
> When is TCP used?
> What additional traffic is added with "snmp-server host" command?
>
> Thank you and have a great day
>
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