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• Priority (0-240, in steps of 16) -- Priority value of the port. The priority value influences the port choice when a
bridge has two ports connected in a loop. The priority value is between 0-240. The priority value is provided in
increments of 16.
• Designated Bridge ID -- The bridge priority and the MAC Address of the designated bridge.
• Designated Port ID-- The selected port□ priority and interface.
• Designated Cost -- Cost of the port participating in the STP topology. Ports with a lower cost are less likely to
be blocked if STP detects loops.
• Forward Transitions -- Number of times the port has changed from the Blocking state to the Forwarding state.
• LAG -- The LAG to which the port is attached.
STP LAG Settings
The STP LAG Settings page contains fields for assigning STP aggregating port parameters.
To open STP LAG Settings screen perform the folling:
1.
Click Switch -> Spanning Tree -> STP LAG Settings
2.
The STP LAG Settings screen is displayed as in Figure 3-60
The page includes the following fields:
• Select a LAG -- The user-defined LAG. For more information, see "Defining LAG Membership".
• STP -- Enables or disables STP on the LAG.
• Fast Link -- Enables Fast Link mode for the LAG. If Fast Link mode is enabled for a LAG, the LAG State is
automatically placed in the Forwarding state when the LAG is up. Fast Link mode optimizes the time it takes
for the STP protocol to converge. STP convergence can take 30-60 seconds in large networks.
• LAG State -- Current STP state of a LAG. If enabled, the LAG state determines what forwarding action is taken
on traffic. If the bridge discovers a malfunctioning LAG, the LAG is placed in the Broken state. Possible LAG
states are:
ú Gigabit Ethernet - 4
Figure 3-60 STP LAG Settings
ú Disabled -- The LAG link is currently down.
ú Blocking -- The LAG is blocked and cannot be used to forward traffic or learn MAC
addresses.
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