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10/100 Fast Ethernet Switch User’s Guide
Switch Management
23
election as the new root. This implies that upon expiration of the
Topology Change Timer the new root trap is sent out immediately
after the Switch’s selection as a new root.
♦
Topology Change
: A Topology Change trap is sent by the Switch
when any of its configured ports tranisitions from the Learning state
to the Forwarding state, or from the Forwarding state to the Blocking
state. The trap is not sent if a new root trap is sent for the same
transition.
♦
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 the port state enter the
partition mode (or automatic partitioning, port disable) when more
than thirty-two collisions occur while transmitting.
MIBs
The information stored in the Switch is known as the Management
Information Base (MIB). The Switch uses the standard MIB-II Management
Information Base module. Consequently, MIB values inside the Switch can
be retrieved from any SNMP-based network manager. 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.