Lantronix LSB4, Installation Manual

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Spanning Tree Algorithm LSB4 Installation Guide
B-2
Spanning Tree
Algorithm
The Spanning Tree Algorithm looks at the network and, if it senses more
than one path from one segment to another, it will disable all except one
path [Figure B-2]. A disabled path may affect more than one port on more
than one switch.
Figure B-2: Network Using Spanning Tree Algorithm
Each disabled port will continue to listen to packet traffic, but will not for-
ward any packets through the switch or transmit any packets out of the
disabled port. When multiple paths to the same segment have been iden-
tified, the path(s) with the highest path cost will be disabled.
The Spanning Tree Algorithm will respond to changes in network config-
uration. If an ethernet port has been disabled due to duplicate paths and
the single operational path becomes inoperable, a disabled ethernet port
will be re-enabled in order to recreate the path.
The Spanning Tree Algorithm is fully incorporated into the LSB4 and will
be enabled by default. To disable the algorithm, use the
Set/Define Switch
Spanning command.
Host 1
Host 2
LSB4 LSB4
LAN A
LAN B
This LAN port is
now in the blocking
state -- it does not
transmit packets