User's Manual

694 CHAPTER 17: USING 3COM NETWORK DIRECTOR ON A MULTI-SITE NETWORK
For example, the service level agreement for a particular link may provide
better-than-best effort service to traffic up to 1Mbps, and then best
effort service to all traffic above that. You may decide that it is
acceptable to have up to 200kbps of the traffic sent via that link treated
as best effort.
To achieve this you can set the speed of the link to 1Mbps and the
threshold for the utilization monitor to 120%. This will cause warning
severity events to be generated when the amount of traffic being treated
as best effort by the link is approaching 200kbps, and errors severity
events to be generated when this limit is exceeded.
Disabling Monitors on WAN Links
3Com Network Director allows you to disable individual monitors that you
are not interested in. See “
Disabling and Enabling Individual Monitors”
on page 294
for details of how to do this.
If you are using a router at a remote site to monitor a WAN link then
disabling individual monitors can reduce the traffic generated by the
monitoring process. However, disabling monitors will also reduce the
amount of information that is available to you about the state of the
WAN link.
Configuration
Configuring Retries
and Timeout Periods
Depending upon the speed and utilization of the WAN links in use,
communications with remote sites can be subject to higher latencies and
more errors than LAN communications. See “
Configurable Timeouts” on
page 683
and “Configurable Retries” on page 684 for more details of
these effects.
In order to address this, 3Com Network Director allows you to control the
number of retries and the timeout periods that are used for the various
different request types.
The configured number of retries is the maximum number of retries
that will be made on top of the initial request. So, for example, if there
are 2 retries configured for a particular request type, this means that
3Com Network Director will make up to three attempts to contact a
device with that request type: the initial request and then the two retries.