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D-Link DHS-3224V Switch User’s Guide
21
New Root
This trap indicates that the Switch has become the new root of the Spanning Tree, the trap is sent by the Switch
soon after it is elected 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 election as the new root.
Topology Change
A Topology Change trap is sent by the Switch when any of its configured ports transitions 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.
Fan Failure
A Fan Failure trap is sent if any of the four system fans fail.
Link Change Event
Link Up This trap is sent whenever the link of a port changes from link down to link up.
Link Down This trap is sent whenever the link of a port changes from link up to link down.
MIBs
Management and counter information 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 management 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 port and type of ports.
Examples of read-only variables are the statistics counters such as the number of errors that have occurred, or the
kilobytes of data received and forwarded through a port.
Read-write MIBs are variables usually related to user-customized configurations. Examples of these are the
Switch's IP Address, Spanning Tree Algorithm parameters, and port status.
If you use third-party vendors' SNMP software to manage the Switch, a diskette listing the Switch's propriety
enterprise MIBs can be obtained by request. If your software provides functions to browse or modify MIBs, you
can also get the MIB values and change them (if the MIBs' attributes permit the write operation). This process
however can be quite involved, since you must know the MIB OIDs and retrieve them one by one.