SMC Networks 7500A/VCP - annexe 1, Руководство по управлению

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S
PANNING
T
REE
P
ROTOCOL
C
ONFIGURATION
2-41
Managing Interface Settings
You can configure STA attributes for specific interfaces, including port
priority, path cost, and fast forwarding. Use a different priority or path cost
for ports of the same media type to indicate the preferred path.
Fields and Attributes
• STA State – Displays the current state of this port within the Spanning
Tree:
• Disabled - No link has been established on this port. Otherwise,
the port has been disabled by the user or has failed diagnostics.
• Blocking - Port receives STA configuration messages, but does
not forward packets.
• Listening - Port will leave blocking state due to a topology
change, start transmitting configuration messages, but
will
not yet
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.
• Broken - Port is malfunctioning or no link has been established.
• 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 - 255