Allied Telesis AT-S63 - Manual (Page 198)

Chapter 12: Spanning Tree and Rapid Spanning Tree Protocols
198 Section IV: Spanning Tree Protocols
Bridge Priority Specifies the priority number for the
bridge. This number is used in
determining the root bridge for RSTP. The
bridge with the lowest priority number is
selected as the root bridge. If two or more
bridges have the same priority value, the
bridge with the numerically lowest MAC
address becomes the root bridge. When a
root bridge goes off-line, the bridge with
the next priority number automatically
takes over as the root bridge. This
parameter can be from 0 (zero) to 61,440
in increments of 4096, with 0 being the
highest priority. For a list of the
increments, refer to Table 31 on
page 190.
Bridge Hello Time Specifies the time interval between
generating and sending configuration
messages by the bridge. This parameter
can be from 1 to 10 seconds. The default
is 2 seconds.
Bridge Forwarding Specifies the waiting period before a
bridge changes to a new state, for
example, when it becomes the new root
bridge after a topology change. If the
bridge transitions too soon, not all links
may have yet adapted to the change,
possibly resulting in a network loop. The
range is 4 to 30 seconds. The default is
15 seconds. This setting applies only to
ports running in the STP-compatible
mode.
Bridge Max Age Specifies the length of time after which
stored bridge protocol data units (BPDUs)
are deleted by the bridge. All bridges in a
bridged LAN use this aging time to test
the age of stored configuration messages
called bridge protocol data units (BPDUs).
For example, if you use the default 20, all
bridges delete current configuration
messages after 20 seconds. This
parameter can be from 6 to 40 seconds.
The default is 20 seconds.
Table 35. RSTP Parameters
Parameter Definition