872 | Rapid Spanning Tree Protocol (RSTP)
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Table 42-2 displays the default values for RSTP.
To change these parameters, use the following commands, on the root bridge:
View the current values for global parameters using the
show spanning-tree rstp command from EXEC
privilege mode. See Figure 42-5.
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 Table 42-2. The
greater the port cost, the less likely the port will be selected to be a forwarding port.
Table 42-2. RSTP Default Values
RSTP
Parameter Default Value
Forward Delay 15 seconds
Hello Time 2 seconds
Max Age 20 seconds
Port Cost 100-Mb/s Ethernet interfaces 200000
1-Gigabit Ethernet interfaces 20000
10-Gigabit Ethernet interfaces 2000
Port Channel with 100 Mb/s Ethernet interfaces 180000
Port Channel with 1-Gigabit Ethernet interfaces 18000
Port Channel with 10-Gigabit Ethernet interfaces 1800
Port Priority 128
Task Command Syntax Command Mode
Change the forward-delay parameter.
• Range: 4 to 30
• Default: 15 seconds
forward-delay seconds PROTOCOL
SPANNING TREE
RSTP
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
hello-time seconds PROTOCOL
SPANNING TREE
RSTP
Change the max-age parameter.
Range: 6 to 40
Default: 20 seconds
max-age seconds PROTOCOL
SPANNING TREE
RSTP
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