Administrator Guide

Bridge ID Priority 32768, Address 0001.e80d.2462
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
-------------- ------ ---- ---- --- ----- --------------------
Tengig 1/1 8.496 8 4 DIS 0 32768 0001.e80d.2462 8.496
Tengig 1/2 8.497 8 4 DIS 0 32768 0001.e80d.2462 8.497
Tengig 1/3 8.513 8 4 FWD 0 32768 0001.e80d.2462 8.513
Tengig 1/4 8.514 8 4 FWD 0 32768 0001.e80d.2462 8.514
Dell#
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
Removing an Interface from the Spanning Tree Group
To remove a Layer 2 interface from the spanning tree topology, use the following command.
• Disable spanning tree on a Layer 2 interface.
INTERFACE mode
no 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 67. STP Default Values
STP Parameters Default Value
Forward Delay 15 seconds
Hello Time 2 seconds
Max Age 20 seconds
Port Cost
• 40-Gigabit Ethernet interfaces
• 10-Gigabit Ethernet interfaces
• Port Channel with 40-Gigabit Ethernet interfaces
• Port Channel with 10-Gigabit Ethernet interfaces
• 1
• 2
• 1
• 1
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
788
Spanning Tree Protocol (STP)