Reference Guide

Spanning Tree Protocol (STP) | 895
Adding an Interface to the Spanning Tree Group
To add a Layer 2 interface to the Spanning Tree topology:
Removing an Interface from the Spanning Tree Group
To remove a Layer 2 interface from the Spanning Tree topology:
Modifying Global Parameters
You can modify 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 Spanning Tree.
Table 50-2 displays the default values for Spanning Tree.
Task Command Syntax Command Mode
Enable Spanning Tree on a Layer 2 interface.
spanning-tree 0
INTERFACE
Task Command Syntax Command Mode
Disable Spanning Tree on a Layer 2 interface.
no spanning-tree 0
INTERFACE
Note: Dell Networking recommends that only experienced network administrators change the Spanning
Tree parameters. Poorly planned modification of the Spanning Tree parameters can negatively impact
network performance.
Table 50-2. STP Default Values
STP Parameter Default Value
Forward Delay 15 seconds
Hello Time 2 seconds
Max Age 20 seconds
Port Cost 1-Gigabit Ethernet interfaces 4
10-Gigabit Ethernet interfaces 2
40-Gigabit Ethernet interfaces 2
Port Channel with 1-Gigabit Ethernet interfaces 3
Port Channel with 10-Gigabit Ethernet interfaces 1
Port Priority 8