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314 Configuring Switching Information
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 Fast
— Enables Port Fast mode for the LAG. If Port Fast mode is enabled for a LAG, the
Port
State
is automatically placed in the
Forwarding
state
when the LAG is up. Port Fast mode optimizes
the time it takes for the STP protocol to converge. STP convergence can take 30–60 seconds in large
networks.
•
Port State
— 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.