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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
56 Switch Management and Operating Concepts
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 how many kilobytes of data have
been 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 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 enters the relationship between destination MAC or
IP addresses and the Ethernet port or gateway router the
destination resides on into its forwarding table. This
information is then used to forward packets. This reduces the
traffic congestion on the network, because packets, instead of
being transmitted to all ports, are transmitted to the
destination port only. Example: if Port 1 receives a packet
destined for a station on Port 2, the Switch transmits that
packet through Port 2 only, and transmits nothing through the