SMC Networks 6709L2, Management Manual

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Configuring Port STP Settings
Use the Perport Configuration page to set STA attributes for specific
ports, including port priority and path cost. You can use a different priority
or path cost for ports of the same media type to indicate the preferred
path.
Field Attributes
• 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
• Path Cost – This parameter is used by the STP 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.)
• Full Range: 1-65535
• Recommended Range –
- Ethernet: 50-600
- Fast Ethernet: 10-60
- Gigabit Ethernet: 3-10
• Defaults –
- Ethernet – half duplex: 100; full duplex: 95; trunk: 90
- Fast Ethernet – half duplex: 19; full duplex: 18; trunk: 15
- Gigabit Ethernet – full duplex: 4