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Configuration Commands
131
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-
bridge priority {<0-65535>}
Configures the CIST bridge priority. The bridge priority parameter
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-
bridge maximum-age {<6-40>}
Configures the CIST bridge maximum age. The maximum age parameter
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