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• STA State – Displays current state of this port within the Spanning
Tree. (
See “Displaying Interface Settings” on page 3-160. 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:
• MST Instance ID – Instance identifier to configure. (Default: 0)
• 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)
• MST Path Cost – This parameter is used by the MSTP 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.
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