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S
PANNING
T
REE
A
LGORITHM
C
ONFIGURATION
3-171
- 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
14
– Indicates if a port is a member of a trunk.
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
• Admin Path Cost – This parameter is used by the STA to determine the
best path between devices. Therefore, lower values should be assigned
to ports attached to faster media, and higher values assigned to ports
with slower media. (Path cost takes precedence over port priority.) Note
that when the Path Cost Method is set to short (page 3-63), the
maximum path cost is 65,535.
By default, the system automatically detects the speed and duplex mode
used on each port, and configures the path cost according to the values
shown below. Path cost “0” is used to indicate auto-configuration mode.
14. STA Port Configuration only