Allied Telesis AT-S79 - Manual (Page 307)

AT-S79 Management Software User’s Guide
Section II: Web Browser Interface 307
Protocol Version
Set this field to enable to activate RSTP on the switch. This field is
greyed out until you set the Global RSTP Status to enable. To activate
this field click Apply.
This page contains the following items of information in the middle
portion of the page. You cannot change these fields.
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 is set to 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. You
cannot change these fields.
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 159. 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.
Forward Delay
The time interval between generating and sending configuration
messages by the root bridge.
The lower section provides information about the bridge. The following
parameters appear in the bottom third of the page.