User`s guide

AT-S25 Version 1.4 User’s Guide
47
The Spanning Tree Parameters window in Figure 13 is displayed.
Figure 13 Spanning Tree Parameters Window
4. Adjust the settings as desired.
The parameters are discussed below.
Bridge Priority
Bridges use this number to determine the root bridge for a loop-
free implementation. If bridges happen to have equal priority
values, the bridge with the numerically lowest MAC address
becomes the root bridge. When the root bridge malfunctions, the
bridge with the next priority number (or the next lowest MAC
address) automatically takes over as root bridge. This parameter
can be from 0 (zero) to 65,535, with 0 being the highest priority.
Max Age Time
All bridges in a bridged LAN use this aging time to test the age of
stored configuration messages called bridge protocol data units
(BPDUs). This parameter can be from 6 to 40 seconds. The default
is 20 seconds. For example, if you use the default 20, all bridges
delete current configuration messages after 20 seconds.
Note
The aging time for BPDUs is different from the aging time used by
the MAC address table.