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Common Internal Spanning Tree Bridge Configuration
To display the following form, select Layer 2 > MSTP/RSTP > CIST-Bridge.
The 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 Common Internal Spanning Tree Bridge Configuration controls:
Table 80 Common Internal Spanning Tree Bridge Configuration controls
Control
Description
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 "Switch Spanning Tree Group
Configuration" section for more information.
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 "Switch Spanning Tree Group
Configuration" section for more information.
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 "Switch Spanning Tree Group
Configuration" section for more information.
Lists the VLANs that can be added to the Common Internal Spanning Tree
(CIST).
Lists the VLANs that are members of the Common Internal Spanning Tree
(CIST).
Select a VLAN number in the VLANs Available list and click Add to add the
VLAN to the CIST.
Select a VLAN number in the Cist VLANs list and click Remove to remove the
VLAN from the CIST.
Max. Age (6-40 secs)
Forward Delay (4-30 secs)
VLANs Available
Cist VLANs
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