HP Network Direr Software Products manual Configuring WAN Link Monitors

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determine which end is nearest to the local site and monitor that. This will prevent the monitoring from generating traffic over the WAN link.

■If you have a point-to-multi-point WAN configuration and have logically grouped the interfaces involved together, or wish to monitor a point-to-point link at both ends, then you can start monitoring on all of the links that form a part of that connection.

The monitors available for WAN interfaces in 3Com Network Director are all based upon the statistics gathered by the MIBII ifTable. If one or more of the statistics available from this table are not collected by the router for the WAN interface that you wish to monitor then 3Com Network Director will only be able to provide partial monitoring information.

Please refer to the user guide for your router for more information on which statistics are gathered for which WAN interface types.

Configuring WAN Link Monitors

Thresholds can be set for WAN link monitors in the same manner as for all other monitors. See “Setting Thresholds for Monitor-Based Events” on page 356 for details of how to do this.

In addition to setting the thresholds for WAN link monitors you can also configure the speed used to calculate values for the utilization monitor. This allows you to configure the speed of a WAN link to represent any service level agreement or policy you may have in place for that WAN link.

For example, although the WAN interface may have a speed of 2Mbps, you may have an agreement with the ISP that allows you an average throughput of 1Mbps, and only allows you to burst traffic to 2Mbps for short time periods without incurring additional cost. By altering the speed of the WAN link to 1Mbps the utilization calculation will be based upon the service level agreement, and not the maximum link speed. In conjunction with an appropriate threshold setting, this will allow you to spot when you are about to exceed the limits allowed by the service level agreement and so take appropriate action.

3Com Network Director allows you to set thresholds in excess of the theoretical maximum value for the monitor. This is particularly useful for WAN links that have complex service level agreements or policies applied to them.