Allied Telesis AT-S20 - Manual (Page 118)

Concepts
A-2
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The switch provides the following STP features:
❑ Compensates automatically for the failure, removal, or
addition of any bridge in an active data path.
❑ Achieves port changes in short time intervals, which
establishes a stable active topology quickly with a minimum
of network disturbance.
❑ Uses a minimum amount of communications bandwidth to
accomplish the operation of the STP.
❑ Reconfigures the active topology in a manner which is
transparent to stations transmitting and receiving data
packets.
❑ Manages the topology in a consistent and reproducible
manner through the use of STP parameters.
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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 10Base-T ports, the management port, the standard 100
Mbps uplink port, and an optional expansion port, dependent upon
the switch model.
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; for example from 1-27 for a 24-port switch with expansion
modules. 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