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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 106 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
Resets all CIST parameters to their default values.
Command mode: Global configuration
Displays the current CIST configuration.
Command mode: All
default spanning-tree
mstp cist
show spanning-tree mstp
cist
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 107 CIST Bridge Configuration commands
Command
Description
spanning-tree mstp cistbridge 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
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
Configures the CIST bridge forward delay parameter. The forward
delay 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 RSTP. See the "Bridge Spanning
Tree configuration" section for more information.
Command mode: Global configuration
Displays the current CIST bridge configuration.
Command mode: All
spanning-tree mstp cistbridge maximum-age <6-40>
spanning-tree mstp cistbridge forward-delay <4-30>
show spanning-tree mstp cist
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