Mapping Vlans To An Mst Instance - Cisco 220 Series Smart Plus Administration Manual

Spanning Tree Protocol
Configuring Multiple Spanning Tree
STEP 1
STEP 2
STEP 3
NOTE
Cisco 220 Series Smart Plus Switches Administration Guide Release 1.0.0.x
Switches intended to be in the same MST region are never separated by switches
from another MST region. If they are separated, the region become two separate
regions.
This mapping can be done on the VLAN to MST Instance page.
Configuration on this page applies if the system STP mode is MSTP.
To define MSTP properties:
Click Spanning Tree > MSTP Properties.
Enter the following information:
• Region Name—Enter the MSTP region name.
• Revision—Enter an unsigned 16-bit number that identifies the revision of the
current MST configuration. The field range is from 0 to 65535.
• Max Hops—Enter 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.
Click Apply. The MSTP properties are defined, and the Running Configuration file
is updated.

Mapping VLANs to an MST Instance

Use the VLAN to MSTP Instance page to map each VLAN to an Multiple Spanning
Tree Instance (MSTI). For devices to be in the same region, they must have the
same mapping of VLANs to MSTIs.
The same MSTI can be mapped with 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 ten MST instances can be defined on the switch. For those VLANs that are
not explicitly mapped to one of the MST instances, the switch automatically maps
them to the Core and Internal Spanning Tree (CIST) instance. The CIST instance is
MST instance 0.
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