Chapter 13 Spanning Tree Protocol
XGS1930 Series User’s Guide
144
Figure 105
MSTP Network Example
13.8.2 MST Region
An MST region is a logical grouping of multiple network devices that appears as a single device to the
rest of the network. Each MSTP-enabled device can only belong to one MST region. When BPDUs enter
an MST region, external path cost (of paths outside this region) is increased by one. Internal path cost (of
paths within this region) is increased by one when BPDUs traverse the region.
Devices that belong to the same MST region are configured to have the same MSTP configuration
identification settings. These include the following parameters:
• Name of the MST region
• Revision level as the unique number for the MST region
• VLAN-to-MST Instance mapping
13.8.3 MST Instance
An MST Instance (MSTI) is a spanning tree instance. VLANs can be configured to run on a specific MSTI.
Each created MSTI is identified by a unique number (known as an MST ID) known internally to a region.
Thus an MSTI does not span across MST regions.
The following figure shows an example where there are two MST regions. Regions 1 and 2 have 2
spanning tree instances.
Figure 106
MSTIs in Different Regions
Содержание XGS1930-38
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Страница 35: ...35 PART II Technical Reference ...
Страница 105: ...Chapter 8 Basic Setting XGS1930 Series User s Guide 105 Figure 80 Basic Setting Cloud Management ...
Страница 118: ...Chapter 9 VLAN XGS1930 Series User s Guide 118 Figure 89 Advanced Application VLAN Port Based VLAN Setup All Connected ...
Страница 182: ...Chapter 21 Classifier XGS1930 Series User s Guide 182 Figure 129 Classifier Example ...