Spanning Tree
MSTP Instance Settings
254 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
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For those VLANs that are not explicitly mapped to one of the MST instances, the device
automatically maps them to the CIST (Core and Internal Spanning Tree) instance. The CIST
instance is MST instance 0.
To map VLANs to MST Instances:
STEP 1 Click Spanning Tree > VLAN to MSTP Instance.
The VLAN to MSTP Instance page contains the following fields:
• MSTP Instance ID—All MST instances are displayed.
• VLANs—All VLANs belonging to the MST instance are displayed.
STEP 2 To add a VLAN to an MSTP instance, select the MST instance, and click Edit.
STEP 3 Enter the parameters:
• MSTP Instance ID—Select the MST instance.
• VLANs—Define the VLANs being mapped to this MST instance.
• Action—Define whether to Add (map) the VLAN to the MST instance or Remove it.
STEP 4 Click Apply. The MSTP VLAN mappings are defined, and the Running Configuration file is
updated.
MSTP Instance Settings
The MSTP Instance Settings page enables you to configure and view parameters per MST
instance. This is the per-instance equivalent to the Configuring STP Status and Global
Settings.
To enter MSTP instance settings:
STEP 1 Click Spanning Tree > MSTP Instance Settings.
STEP 2 Enter the parameters.
• Instance ID—Select an MST instance to be displayed and defined.
• Included VLAN—Displays the VLANs mapped to the selected instance. The default
mapping is that all VLANs are mapped to the common and internal spanning tree
(CIST) instance 0).
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