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ONFIGURING
THE
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WITCH
3-148
Configuring Interface Settings for MSTP
You can configure the STA interface settings for an MST Instance using
the MSTP Port Configuration and MSTP Trunk Configuration pages.
Field 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:
• MST Instance ID – 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