Re: high speed monitoring

On Wed, Aug 17, 2005 at 04:34:33PM +0200, Ali Al-Shabibi wrote:

> I am trying to develop a high speed monitoring application. I would
> like to monitor the most of the MIB-2 and RMON every several
> milliseconds, but the switch i am testing talks about .07 seconds to
> deal with one request.

> Does anyone know what is the average latency of SNMP (switch
> independant)?

> Does anybody have any experience high speed monitoring?

What is the requirement that makes you want to do this?

There is no "average" latency of SNMP. You'll get different latencies
depending on the device vendor, how busy the device is, the individual
MIB or OID in question, and the underlying network latency.

You can improve response time somewhat by using BULK operations, if
your devices support SNMPv2c. But if you're looking to grab a large
MIB every several milliseconds, you're probably not going to scale
very well, and you may well bring your device to its knees. And if
any kind of WAN is involved, your network latency alone may take up a
good fraction of a second; an intercontinental WAN can easily have
more than 100ms of round-trip latency, and if a satellite link is
involved, you can go a lot higher.

RMON includes a whole lot of features that are intended to reduce the
need for management stations to do a lot of polling. You may want to
use them.

- Morty


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