User's Manual

Key Concepts 279
If an SNMP trap is received that does not have a monitor associated with
it then 3Com Network Director will use the trap to generate an event
directly.For more information see “
The Event Log” on page 319
See “Registering 3Com Network Director as an SNMP Trap Destination”
on page 304
for more information on controlling how 3Com Network
Director registers itself with SNMP trap sources as an SNMP trap
destination.
Monitor-able Items 3Com Network Director can monitor most devices and links that are
displayed in the map, including:
■ Network infrastructure devices
■ Servers
■ End stations
■ NBX phones
■ Ethernet links, including aggregated links
■ WAN links
The particular attributes that can be monitored for a device or link depend
upon the exact type of device or link that is being monitored.
Monitoring Non-3Com Devices
3Com Network Director will monitor most non-3Com network devices to
some extent. However, as some non-3Com devices do not present their
statistics in a standard manner, 3Com Network Director is unable to
provide full monitoring support for non-3Com devices. In particular:
■ 3Com Network Director will not monitor features on non-3Com
devices whose statistics are presented via proprietary mechanisms.
■ 3Com Network Director will not register or de-register itself as an
SNMP trap destination with non-3Com devices.
Link Monitoring When you start monitoring for a link, 3Com Network Director starts
monitoring for the devices at the ends of that link automatically.The
monitors for the link then use the data gathered by one or both of the
devices for the port(s) that the link connects to in order to provide the
data that they require.For monitors which use only one device, the
selection of which device to use as the data source for a link’s monitors is
performed automatically, and is based upon which device provides the
most detailed information about the link. The algorithm used is: