Adding an Interface to the Spanning Tree Group
To add a Layer 2 interface to the spanning tree topology, use the following command.
• Enable spanning tree on a Layer 2 interface.
INTERFACE mode
spanning-tree 0
Modifying Global Parameters
You can modify the spanning tree parameters. The root bridge sets the values for forward-delay, hello-time, and max-age and overwrites
the values set on other bridges participating in STP.
NOTE: Dell Networking recommends that only experienced network administrators change the spanning tree parameters. Poorly
planned modication of the spanning tree parameters can negatively aect network performance.
The following table displays the default values for STP.
Table 91. STP Default Values
STP Parameters Default Value
Forward Delay 15 seconds
Hello Time 2 seconds
Max Age 20 seconds
Port Cost
• 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
• 200000
• 20000
• 2000
• 180000
• 18000
• 1800
Port Priority 8
• Change the forward-delay parameter (the wait time before the interface enters the Forwarding state).
PROTOCOL SPANNING TREE mode
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 congurations (especially those with more ports) Dell Networking recommends increasing the hello-
time.
The range is from 1 to 10.
the default is 2 seconds.
Spanning Tree Protocol (STP)
829
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