Dell Z9500 Configuration Manual page 712

The following table displays the default values for RSTP.
Table 75. RSTP Default Values
RSTP Parameter
Forward Delay
Hello Time
Max Age
Port Cost:
• 100-Mb/s Ethernet interfaces
• 1-Gigabit Ethernet interfaces
• 10-Gigabit Ethernet interfaces
• 40-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
• Port Channel with 40-Gigabit Ethernet interfaces
Port Priority
To change these parameters, use the following commands.
• Change the forward-delay parameter.
PROTOCOL SPANNING TREE RSTP mode
forward-delay seconds
The range is from 4 to 30.
The default is 15 seconds.
• Change the hello-time parameter.
PROTOCOL SPANNING TREE RSTP mode
hello-time seconds
NOTE: With large configurations (especially those configurations 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.
PROTOCOL SPANNING TREE RSTP 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 rstp command from EXEC privilege mode.
Default Value
15 seconds
2 seconds
20 seconds
Port Cost:
• 200000
• 20000
• 2000
• 1400
• 180000
• 18000
• 1800
• 600
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Rapid Spanning Tree Protocol (RSTP) 712