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Configuring Switching Information 351
To di sp la y t he STP LAG Settings page, click Switching → Spanning Tree → STP LAG Settings in the tree
view.
Figure 7-41. STP LAG Settings
The STP LAG Settings page contains the following fields:
• Select a LAG — Specifies the LAG number for which you want to modify STP settings.
•
STP — Enables or disables STP on the LAG. Default is enable.
•
Port Fa st — Enables Port Fast mode for the LAG. If Port Fast mode is enabled for a LAG, the Port
State
is automatically placed in the Forwardi ng state when the LAG is up. Port Fast mode optimizes
the time it takes for the STP protocol to converge. S TP convergence can take 30–60 seconds in large
networks.
•
Port St ate — Displays 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:
–
Disabled — STP is currently disabled on the LAG. The LAG forwards traffic while learning MAC
addresses.
–
Blocking — The LAG is blocked and cannot be used to forward traffic or learn MAC addresses.
–
Listening — The LAG is in the listening mode and cannot forward traffic or learn MAC addresses.