Cisco Systems SG50028PK9NA Manual De Usuario

Mapping VLANs to a MSTP Instance

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Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 

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 the VLAN to MST Instance page.

Use this page if the system operates in MSTP mode.

To define MSTP:

Click Spanning Tree > STP Status and Global Settings. Enable MSTP.

Click Spanning Tree > MSTP Properties.

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. 

Click Apply. The MSTP properties are defined, and the Running Configuration file 
is updated.

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. 

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 on the 500 Series switches in addition to 
instance zero.