Dell S4048T, Configuration Manual

Page: 1051 / 1277

forward-delay seconds
The range is from 4 to 30.
The default is 15 seconds .
• Change the
hello-time
parameter (the BPDU transmission interval).
PROTOCOL SPANNING TREE mode
hello-time seconds
NOTE: With large configurations (especially those with more ports) Dell Networking recommends
increasing the hello-time.
The range is from 1 to 10.
the default is 2 seconds .
• Change the
max-age
parameter (the refresh interval for configuration information that is generated by
recomputing the spanning tree topology).
PROTOCOL SPANNING TREE mode
max-age seconds
The range is from 6 to 40.
The default is 20 seconds .
To view the current values for global parameters, use the
show spanning-tree 0
command from EXEC
privilege mode. Refer to the second example in Enabling Spanning Tree Protocol Globally .
Modifying Interface STP Parameters
You can set the port cost and port priority values of interfaces in Layer 2 mode.
• Port cost — a value that is based on the interface type. The greater the port cost, the less likely the port
is selected to be a forwarding port.
• Port priority — influences the likelihood that a port is selected to be a forwarding port in case that
several ports have the same port cost.
The default values are listed in Modifying Global Parameters .
To change the port cost or priority of an interface, use the following commands.
• Change the port cost of an interface.
INTERFACE mode
spanning-tree 0 cost cost
The range is from 0 to 65535.
The default values are listed in Modifying Global Parameters .
• Change the port priority of an interface.
Spanning Tree Protocol (STP) 1051