Configuration Commands

Bridge Spanning Tree configuration

Spanning tree bridge parameters can be configured for each Spanning Tree Group. STP bridge parameters include:

•Bridge priority

•Bridge hello time

•Bridge maximum age

•Forwarding delay

•Current bridge configuration

The following table describes the Bridge Spanning Tree Configuration commands.

Table 109 Bridge Spanning Tree Configuration commands

Command

Description

 

 

spanning-tree stp {<1-128>}

Configures the bridge priority. The bridge priority parameter controls

bridge priority {<0-65535>}

which bridge on the network is the STP root bridge.

 

To make this switch the root bridge, configure the bridge priority lower

 

than all other switches and bridges on your network. The lower the value,

 

the higher the bridge priority. The range is 0 to 65535, and the default

 

is 32768.

 

RSTP/MSTP: The range is 0 to 61440, in steps of 4096 (0, 4096,

 

8192...), and the default is 32768.

 

This command does not apply to MSTP. See the “Common Internal

 

Spanning Tree configuration” section for more information.

 

Command mode: Global configuration

 

 

spanning-tree stp {<1-128>}

Configures the bridge hello time. The hello time specifies how often the

bridge hello-time {<1-10>}

root bridge transmits a configuration bridge protocol data unit (BPDU).

 

Any bridge that is not the root bridge uses the root bridge hello value.

 

The range is 1 to 10 seconds, and the default is 2 seconds.

 

This command does not apply to MSTP. See the “Common Internal

 

Spanning Tree configuration” section for more information.

 

Command mode: Global configuration

 

 

spanning-tree stp {<1-128>}

Configures the bridge maximum age. The maximum age parameter

bridge maximum-age {<6-40>}

specifies the maximum time the bridge waits without receiving a

 

configuration bridge protocol data unit before it reconfigures the STP

 

network. The range is 6 to 40 seconds, and the default is 20 seconds.

 

This command does not apply to MSTP. See the “Common Internal

 

Spanning Tree configuration” section for more information.

 

Command mode: Global configuration

 

 

spanning-tree stp {<1-128>}

Configures the bridge forward delay parameter. The forward delay

bridge forward-delay {<4-30>}

parameter specifies the amount of time that a bridge port has to wait

 

before it changes from the listening state to the learning state and from

 

the learning state to the forwarding state. The range is 4 to 30 seconds,

 

and the default is 15 seconds.

 

This command does not apply to MSTP. See the “Common Internal

 

Spanning Tree configuration” section for more information.

 

Command mode: Global configuration

 

 

show spanning-tree stp

Displays the current bridge STP parameters.

{<1-128>} bridge

Command mode: All

 

 

 

 

135