HP Network Direr Software Products manual Disabling Monitors on WAN Links

694CHAPTER 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 Depending upon the speed and utilization of the WAN links in use, and Timeout Periods 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.