FTOS Configuration Guide for the C-Series - Force10 Networks

Task Command Syntax Command Mode
Change the max-age parameter (the refresh interval for
configuration information that is generated by recomputing the
Spanning Tree topology).
Range: 6 to 40
Default: 20 seconds
View the current values for global parameters using the show spanning-tree 0 command from EXEC
privilege mode. See Figure 271.
Modifying Interface STP Parameters
You can set the port cost and port priority values of interfaces in Layer 2 mode.
• Port cost is a value that is based on the interface type. The greater the port cost, the less likely the port
will be selected to be a forwarding port.
• Port priority influences the likelyhood that a port will be selected to be a forwarding port in case that
several ports have the same port cost.
The default values are listed in Table 39.
To change the port cost or priority of an interface:
View the current values for interface parameters using the show spanning-tree 0 command from EXEC
privilege mode. See Figure 271.
Enabling PortFast
max-age seconds PROTOCOL
SPANNING TREE
Task Command Syntax Command Mode
Change the port cost of an interface.
Range: 0 to 65535
Default: see Table 39.
Change the port priority of an interface.
Range: 0 to 15
Default: 8
spanning-tree 0 cost
cost
spanning-tree 0
priority priority-value
INTERFACE
INTERFACE
The PortFast feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner.
Interfaces forward frames by default until they receive a BPDU that indicates that they should behave
otherwise; they do not go through the Learning and Listening states.
Caution: Enable PortFast only on links connecting to an end station. PortFast can cause loops if it is
enabled on an interface connected to a network.
392 Spanning Tree Protocol