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10/100 Fast Ethernet Switch User’s Guide
24
Switch Management
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 a 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.
Packet Forwarding
The Switch looks at the network configuration to forward packets. This
reduces the traffic congestion on the network, because packets, instead of
being transmitted to all segments, are transmitted to the destination only.
Example: if Port 1 receives a packet destined for Port 2, the Switch
transmits that packet through Port 2 only, and transmits nothing through Port
1.
♦
Filtering Database.
A Switch filters frames, i.e., does not relay
frames received by a Switch Port to other Ports on that Switch, in
order to prevent the duplication of frames. Frames transmitted
between a pair of end stations can be confined to LANs that form a
path between those end stations.
The functions that support the use and maintenance of filtering
database information are:
1.
Permanent configuration of reserved addresses.
2.
Explicit configuration of static filtering information.
3.
Automatic learning of dynamic filtering information through
observation of Switched Local Area Network traffic.
4.
Aging out of filtering information that has been automatically learned.