Configuration Commands

Common Internal Spanning Tree configuration

The Common Internal Spanning Tree (CIST) provides compatibility with different MSTP regions and with devices running different Spanning Tree instances. It is equivalent to Spanning Tree Group 0.

The following table describes the commands used to configure CIST commands. Table 105 CIST Configuration commands

Command

Description

 

 

spanning-tree mstp cist-add-vlan <1-4095>

Adds VLANs to the CIST. Enter one VLAN per line, and

 

press Enter to add the VLANs.

 

Command mode: Global configuration

 

 

default spanning-tree mstp cist

Resets all CIST parameters to their default values.

 

Command mode: Global configuration

 

 

show spanning-tree mstp cist

Displays the current CIST configuration.

 

Command mode: All

 

 

CIST bridge configuration

CIST bridge parameters are used only when the switch is in MSTP mode. CIST parameters do not affect operation of STP/PVST.

The following table describes the commands used to configure CIST Bridge Configuration commands. Table 106 CIST Bridge Configuration commands

Command

Description

 

 

spanning-tree mstp cist-

Configures the CIST bridge priority. The bridge priority parameter

bridge priority {<0-65535>}

controls which bridge on the network is the MSTP 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.

 

This command does not apply to RSTP. See the "Bridge Spanning Tree

 

configuration" section for more information.

 

Command mode: Global configuration

 

 

spanning-tree mstp cist-

Configures the CIST 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 MSTP

 

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

 

This command does not apply to RSTP. See the "Bridge Spanning Tree

 

configuration" section for more information.

 

Command mode: Global configuration

 

 

131