Allied Telesis AT-S80 Guía de usuario Pagina 116

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Chapter 9: Rapid Spanning Tree Protocol (RSTP)
116 Section II: Menus Interface
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 111. 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 following parameters refer to the switch.
Bridge ID
The MAC address of the bridge. The bridge identifier is use as a tie
breaker in the selection of the root bridge when two or more bridges
have the same bridge priority. You cannot change this setting.
Bridge Hello Time
This is the time interval between generating and sending configuration
messages by the bridge. This parameter is active only when the switch
is the root bridge.
Bridge Maximum Age
The length of time after which stored bridge protocol data units
(BPDUs) are deleted by the bridge.
Bridge Forward Delay
This is the time interval between generating and sending configuration
messages by the bridge.
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