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S
PANNING
T
REE
A
LGORITHM
C
ONFIGURATION
3-141
Command Attributes
The following attributes are read-only and cannot be changed:
• STA State – Displays current state of this port within the Spanning
Tree. (See Displaying Interface Settings on page 3-136 for additional
information.)
• Discarding - Port receives STA configuration messages, but does
not forward packets.
• Learning - Port has transmitted configuration messages for an
interval set by the Forward Delay parameter without receiving
contradictory information. Port address table is cleared, and the
port begins learning addresses.
• Forwarding - Port forwards packets, and continues learning
addresses.
• Trunk – Indicates if a port is a member of a trunk.
(STA Port Configuration only)
The following interface attributes can be configured:
• Spanning Tree – Enables/disables STA on this interface. (Default:
Enabled).
• Priority – Defines the priority used for this port in the Spanning Tree
Protocol. If the path cost for all ports on a switch are the same, the port
with the highest priority (i.e., lowest value) will be configured as an
active link in the Spanning Tree. This makes a port with higher priority
less likely to be blocked if the Spanning Tree Protocol is detecting
network loops. Where more than one port is assigned the highest
priority, the port with lowest numeric identifier will be enabled.
• Default: 128
• Range: 0-240, in steps of 16
• Path Cost – This parameter is used by the STP to determine the best
path between devices. Therefore, lower values should be assigned to