Spanning Tree
VLANs to a MSTP Instance
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4 253
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Switches intended to be in the same MST region are never separated by switches from another
MST region. If they are separated, the region becomes two separate regions.
This mapping can be done in theVLANs to a MSTP Instance page.
Use this page if the system operates in MSTP mode.
To define MSTP:
STEP 1 Click Spanning Tree > STP Status and Global Settings.
STEP 2 Enable MSTP.
STEP 3 Click Spanning Tree > MSTP Properties.
STEP 4 Enter the parameters.
• Region Name—Define an MSTP region name.
• Revision—Define an unsigned 16-bit number that identifies the revision of the current
MST configuration. The field range is from 0 to 65535.
• Max Hops—Set the total number of hops that occur in a specific region before the
BPDU is discarded. Once the BPDU is discarded, the port information is aged out. The
field range is from 1 to 40.
• IST Master—Displays the regions master.
STEP 5 Click Apply. The MSTP properties are defined, and the Running Configuration file is updated.
VLANs to a MSTP Instance
The VLAN to MSTP Instance page enables you to map each VLAN to a Multiple Spanning
Tree Instance (MSTI). For devices to be in the same region, they must have the same mapping
of VLANs to MSTIs.
NOTE The same MSTI can be mapped to more than one VLAN, but each VLAN can only have one
MST Instance attached to it.
Configuration on this page (and all of the MSTP pages) applies if the system STP mode is
MSTP.
Up to 16 MST instances can be defined in addition to instance zero.
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