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STP LAG Settings Page
The STP LAG Settings page contains the following fields:
Select a LAG—Indicates the user-defined LAG. For more information on defining LAGs, see
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STP—Enables STP on the LAG. The possible field values are:
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Enable—Enables STP on the LAG.
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Disable—Disables STP on the LAG.
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Fast Link—Enables Fast Link for the LAG. If Fast Link is enabled for a LAG, the LAG is automatically placed in the Forwarding State. Fast Link optimizes
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the time it takes for the STP protocol to converge (STP convergence can take 30-60 seconds in large networks).
NOTE:
Use the Fast Link option only in appropriate cases; for example, when the device is a leaf in the STP network topology for end stations.
LAG State—Indicates the current STP state for a LAG. If enabled, the LAG State determines what forwarding action is taken on traffic. If the bridge
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discovers a malfunctioning LAG, the LAG is placed in the Disabled state. The possible field values are:
Disabled—The link is currently down.
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Blocking—The LAG is currently blocked and cannot be used to forward traffic or learn MAC addresses.
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Listening—The LAG is currently in the listening mode. The LAG cannot forward traffic or learn MAC addresses.
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Learning—The LAG is currently in the learning mode. The LAG cannot forward traffic; however, it can learn new MAC addresses.
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Forwarding—The LAG is currently in the forwarding mode. The LAG can forward traffic and learn new MAC addresses.
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Speed—The speed of the ports comprising the LAG.
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Path Cost (1-65535)—Indicates the amount this LAG contributes to the Root Path Cost. The Path Cost can be adjusted to a higher or lower value and
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can forward traffic to or away from a path being rerouted. The path cost has a value of 1 to 65,535.
Default Path Cost—Indicates the default path cost. The default path cost for a LAG is 4.
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Priority (0-255)—Indicates the priority value of the LAG. The Priority value can be used to influence the LAG choice when a bridge has two looped
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ports on the same LAN. The priority value is between 0 -255.
Designated Bridge ID—Indicates the priority and MAC Address for the designated bridge.
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Designated Port—Indicates the priority and MAC Address for the selected port.
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Designated Cost—Indicates the Designated Cost.
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Forward Transitions—Indicates the number of times the port has changed from the blocking state to forwarding.
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"Defining LAG
Membership".
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