Alcatel-Lucent omnistack 6124 User Manual
Web-Based Management
3-16
Spanning Tree Algorithm (STA)
The Spanning Tree Algorithm can be used to detect and disable network loops, and
to provide backup links between switches, bridges or routers. This allows the switch
to interact with other bridging devices (that is, STA-compliant switch, bridge or
router) in your network to ensure that only one route exists between any two stations
on the network. For a more detailed description of how to use this algorithm, refer to
“Spanning Tree Algorithm” on page 4-1.
to provide backup links between switches, bridges or routers. This allows the switch
to interact with other bridging devices (that is, STA-compliant switch, bridge or
router) in your network to ensure that only one route exists between any two stations
on the network. For a more detailed description of how to use this algorithm, refer to
“Spanning Tree Algorithm” on page 4-1.
Spanning Tree Information
The Spanning Tree Information screen displays a summary of the STA information
for the overall bridge or for a specific port. To make any changes to the parameters
for the Spanning Tree, use the Spanning Tree Configuration menu.
for the overall bridge or for a specific port. To make any changes to the parameters
for the Spanning Tree, use the Spanning Tree Configuration menu.
Spanning Tree
The parameters shown in the following figure and table describe the current bridge
STA Information.
STA Information.
Parameter
Description
Spanning Tree State
Shows if the switch is enabled to participate in an STA-compliant network.
Bridge ID
A unique identifier for this bridge, consisting of bridge priority plus MAC
address (where the address is normally taken from the agent).
Max Age
The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure.
Hello Time
The time interval (in seconds) at which the root device transmits a configuration
message.
Forward Delay
The maximum time (in seconds) the root device will wait before changing
states (i.e., listening to learning to forwarding).
Designated Root
The priority and MAC address of the device in the spanning tree that this switch
has accepted as the root device.
Root Port
The number of the port on this switch that is closest to the root. This switch
communicates with the root device through this port. If there is no root port,
then this switch has been accepted as the root device of the spanning tree
network.
Root Path Cost
The path cost from the root port on this switch to the root device.
Configuration Changes
The number of times the spanning tree has been reconfigured.
Last Topology Change
The time since the spanning tree was last reconfigured.