"Haibo Yang" <hbyang AT sysway DOT com> writes:

> Hello, List:
> 
> I have been working with NetView for two months or so. And there are
> still some basic knowledge which I don't know.  
>
> For instance, in a netview enviroment, what is the size of a snmp
> packet? This is rather important, because too much snmp pactket can
> compromise the network performance, especial in a low ddn bandwidth
> links.

The size of an snmp datagram varies depending upon its payload.  It's
generally pretty small, but an ICMP "ping" request and response is
admittedly quite a bit shorter. A GET can be relatively short if it
gets one value.  A SET can be equally short.  The GET response will be
relatively short.  An snmpwalk generates a short GET with a lot of
GETNEXT's following it, and there are answers from the agent for each,
which can add up to a fair amount of traffic.  

The NetView MidLevel Manager (MLM) component exists to distribute
polling to remote networks and aggregate trap handling such that you
minimize traffic over your WAN link.  THis may be something you'll
want to investigate.  MLM has its own manual I believe. 

> Briefly speaking, What is the difference between snmp v1, snmp v2,
> snmpv3?

v1 has its own PDU format
v2 and v3 share a data format...but v3 adds security. 

NetView does all it's goodies using V1 get's and set's (with one
exception the web mib browser).  NetView can receive v1 and v2 traps.
If you use netview MLM, the MLM can only pass v1 traps. 

-- 
jb

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