802.1W Rapid Spanning Tree - D-Link DES-3250TG User Manual

DES-3250TG Layer 2 Fast Ethernet Switch User's Guide
receives a packet destined for a station on Port 2, the Switch
transmits that packet through Port 2 only, and transmits
nothing through the other ports. This process is referred to as
'learning' the network topology.
MAC Address Aging Time
The Aging Time affects the learning process of the Switch.
Dynamic forwarding table entries, which are made up of the
source MAC addresses and their associated port numbers, are
deleted from the table if they are not accessed within the aging
time.
The aging time can be from 10 to 1,000,000 seconds with a
default value of 300 seconds. A very long aging time can result
in dynamic forwarding table entries that are out-of-date or no
longer exist. This may cause incorrect packet forwarding
decisions by the switch.
If the Aging Time is too short however, many entries may be
aged out too soon. This will result in a high percentage of
received packets whose destination addresses cannot be found
in the forwarding table, in which case the switch will broadcast
the packet to all ports, negating many of the benefits of having
a switch.
Static forwarding entries are not affected by the aging time.

802.1w Rapid Spanning Tree

The Switch implements two versions of the Spanning Tree
Protocol, the Rapid Spanning Tree Protocol (RSTP) as defined
by the IEEE 802.1w specification and a version compatible with
the IEEE 802.1d STP. RSTP can operate with legacy equipment
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