Allied Telesis AT-S81 - Manual (Page 300)

Chapter 28: RSTP
300 Section II: Web Browser Interface
Basic RSTP Configuration
To configure the RSTP settings, perform the following procedure:
1. From the Basic Config menu, select Rapid Spanning Tree > RSTP
Config.
The Rapid Spanning Tree Configuration page is shown in Figure 91 on
page 298.
The RSTP Configuration page allows you to configure RSTP as well
as to view the current settings and contains the following items of
information in the middle portion:
Root Port
The active port on the switch that is communicating with the root
bridge. If the switch is the root bridge for the LAN, then there is no root
port and the root port parameter will be 0.
Root Path Cost
The sum of all the root port costs of all the bridges between the
switch’s root port and the root bridge including the switch’s root port
cost.
Time Since Topology Change
The time in seconds since the last topology change took place. When
RSTP detects a change to the LAN’s topology or when the switch is
rebooted, this parameter is reset to 0 seconds and begins
incrementing until the next topology change is detected.
Topology Change Count
An integer that reflects the number of times RSTP has detected a
topology change on the LAN since the switch was initially powered on
or rebooted.
The following parameters refer to the designated root bridge:
Designated Root
This parameter includes two fields: the root bridge priority and the
MAC address of the root bridge. For example, 1000 00C08F1211BB
shows the root bridge priority as 1000, and 00C08F1211BB as the
MAC address.
Hello Time
The hello time. See “Hello Time and Bridge Protocol Data Units
(BPDUs)” on page 157. This parameter affects only the root bridge.
Maximum Age
The maximum amount of time that BPDUs are stored before being
deleted on the root bridge.