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Updated:December 11, 2018
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Multiple Spanning Tree Protocol (MSTP) Instance Configuration on ESW2-550X Switch
Multiple Spanning Tree Protocol (MSTP) is an extension to Rapid Spanning Tree Protocol (RSTP). MSTP enables formation of Multiple Spanning Tree (MST) regions that can run multiple MSTP instances (MSTI). The MSTI settings allow you to configure and view the parameters of each MSTI.
Note: The same MSTI can be mapped to more than one VLAN, but each VLAN can only have one MSTI attached to it.
The objective of this article is to view and configure MSTI on ESW2-550X stackable managed switches.
• ESW2-550X • ESW2-550X-DC
MSTP Instance Settings
Before the instance configuration of MSTP, you should choose the Multiple STP mode of operation; refer to the article Configure Spanning Tree Protocol (STP) Status and Global Settings on ESW2-550X Switch.
Step 1. Log in to the web configuration utility and choose Spanning Tree > MSTP Instance Settings. The MSTP Instance Settings page opens:
Step 2. Choose the desired MSTI from the Instance ID drop-down list.
Note: The included VLAN for the chosen instance is displayed in the Included VLAN field. To map VLANs to an MSTI refer to the article VLAN to MSTP Instance Mapping on ESW2-550X Switch.
Step 3. Enter the priority of the bridge in the Bridge Priority field. The bridge with lower priority is chosen as the root bridge. If there are bridges with same priority then the MAC addresses are compared. The bridge priority value should be in increments of 4096.
The following information is displayed:
• Designated Root Bridge — The priority and the MAC address of the root bridge for the MSTI.
• Root Port — Root port of the chosen instance.
• Root Path Cost — Root path cost of the chosen instance.
• Bridge ID — The priority and MAC address of the switch for the MSTI.
• Remaining Hops — Number of hops until the next destination.