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Stackable NWay Ethernet Switch User’s Guide
32 Switch Management Concepts
? ?
Link Change Event This trap is sent whenever the link of a
port changes from link up to link down or from link down to
link up.
? ? Port Partition This trap is sent whenever a port is
partitioned as a result of more than sixty-two collisions on the
port (i.e., is automatically partitioned). The number of
collisions that triggers this trap is the same at either 10Mbps
or 100Mbps.
? ? Broadcast Storm This trap is sent whenever the port
reaches the broadcast storm rising or falling threshold.
MIBs
Management information and counters are stored in the Switch in
the Management Information Base (MIB). The Switch uses the
standard MIB-II Management Information Base module.
Consequently, values for MIB objects can be retrieved from any
SNMP-based network manager software. In addition to the standard
MIB-II, the Switch also supports its own proprietary enterprise MIB
as an extended Management Information Base. These MIBs may also
be retrieved by specifying the MIB’s Object-Identity (OID) at the
network manager. MIB values can be either read-only or read-write.
Read-only MIBs variables can be either constants that are
programmed into the Switch, or variables that change while the
Switch is in operation. Examples of read-only constants are the
number of ports and types of ports. Examples of read-only variables
are the statistics counters such as the number of errors that have
occurred, or how many kilobytes of data have been received and
forwarded through a port.