Modify Interface Parameters - Dell Force10 Z9000 Configuration Manual

Table 38-2
Table 38-2. RSTP Default Values
RSTP Parameter
Forward Delay
Hello Time
Max Age
Port Cost
Port Priority
To change these parameters, use the following commands, on the root bridge:
Task
Change the forward-delay parameter.
• Range: 4 to 30
• Default: 15 seconds
Change the hello-time parameter.
Note: With large configurations (especially those with more ports) Dell
Force10 recommends that you increase the hello-time.
Range: 1 to 10
Default: 2 seconds
Change the max-age parameter.
Range: 6 to 40
Default: 20 seconds
View the current values for global parameters using the
privilege mode. See

Modify Interface Parameters

On interfaces in Layer 2 mode, you can set the port cost and port priority values.
• Port cost is a value that is based on the interface type. The default values are listed in
greater the port cost, the less likely the port will be selected to be a forwarding port.
• Port priority influences the likelihood that a port will be selected to be a forwarding port in case that
several ports have the same port cost.
| Rapid Spanning Tree Protocol (RSTP)
776
displays the default values for RSTP.
100-Mb/s Ethernet interfaces
1-Gigabit Ethernet interfaces
10-Gigabit Ethernet interfaces
Port Channel with 100 Mb/s Ethernet interfaces
Port Channel with 1-Gigabit Ethernet interfaces
Port Channel with 10-Gigabit Ethernet interfaces
Figure 38-5.
Default Value
15 seconds
2 seconds
20 seconds
200000
20000
2000
180000
18000
1800
128
Command Syntax
forward-delay seconds
hello-time seconds
max-age seconds
show spanning-tree rstp
Command Mode
PROTOCOL
SPANNING TREE
RSTP
PROTOCOL
SPANNING TREE
RSTP
PROTOCOL
SPANNING TREE
RSTP
command from EXEC
Table 38-2. The