Allied Telesis AT-S21 - Manual (Page 83)

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Several configuration parameters control the operation of the
Spanning Tree Protocol. Table A-1 describes the parameters and lists
each parameter’s default settings for the switch. The port numbers
include the twenty-four 10Base-T or 100Base-TX ports.
Table A-1 Spanning Tree Protocol Parameters
Parameter and Description Default
Bridge Group Address
Unique MAC group address, recognized by all
bridges in the network N/A
Bridge Identifier
Identifier for each bridge, consisting of two
parts: a 16-bit bridge priority and a 48-bit
network adapter address. Ports are numbered
in absolute numbers; from 1-n for a multi-port
switch including optional expansion ports, if
any. The network adapter address is the same
address as the first port of the bridge. 32768
(bridge priority)
Port Priority 128
Port Cost
The spanning tree algorithm calculates and
ensures that an active topology generates
minimal path costs. 100 for 10 Mbps ports
10 for 100 Mbps ports