HP Network Direr Software Products manual Key Considerations

Key Considerations 751

values. See “Determining Appropriate Retry and Timeout Periods” on page 701 for details of how to do determine appropriate values.

If you have already determined what appear to be appropriate values for the remote site then the problem may be caused by the amount of traffic generated by the discovery process itself. If that is the case then you may either try increasing the values further still to allow for the overhead of the discovery process, or try focusing the discovery on those devices that are most important for you to monitor and manage. Details of the latter approach are given in “Configuring Discovery” on page 710.

If you try increasing the numbers of retries and timeout periods to allow of the overhead of the discovery process then be aware that this will increase the time it takes 3Com Network Director to determine that a device at that site has stopped responding when it is monitoring or managing that device.

See “Determining Appropriate Retry and Timeout Periods” on page 701 for more information on the issues that this causes.

Problems with Depending upon your network configuration you may find that Discovering WAN discovering a subnet that a WAN router has an IP address on fails to

Routers discover the WAN router, does not determine the features and configuration of the WAN router, or only shows the WAN router as a MAC-only device in the map. There are various reasons why this may occur:

■If the WAN router is owned and managed by your service provider then 3Com Network Director will be unlikely to be able to discover them at all. While the onus for the management of the WAN router is on your service provider in such a network configuration, note that this will prevent you from being able to monitor the utilization of your WAN links from within 3Com Network Director.

■The WAN router may have had its SNMP community strings changed from the factory defaults. 3Com recommends that you change the SNMP community strings from their factory defaults on all SNMP-capable devices in your network, as this will increase the security of your network infrastructure. If you have changed the SNMP community strings of your WAN router then you should enter the new values in the Community Strings step of the Network Discovery wizard. See “Community Strings Pane” on page 118 for more details.