H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 168)

20-10
description about VLANs, refer to VLAN in H3C WX6103 Access Controller Switch Interface Board
Configuration Guide .
MSTP features the following:
z
MSTP supports mapping VLANs to MST instances by means of a VLAN-to-instance mapping table.
MSTP can save communication overheads and resource usage by mapping multiple VLANs to one
MST instance.
z
MSTP divides a switched network into multiple regions, each containing multiple spanning trees
that are independent of one another.
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MSTP prunes loop networks into a loop-free tree, thus avoiding proliferation and endless recycling
of packets in a loop network. In addition, it provides multiple redundant paths for data forwarding,
thus supporting load balancing of VLAN data in the data forwarding process.
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MSTP is compatible with STP and RSTP.
Basic concepts in MSTP
Assume that all the four switches in Figure 20-4 are running MSTP. In light with the diagram, the
following paragraphs will present some basic concepts of MSTP.
Figure 20-4 Basic concepts in MSTP
1) MST region
A multiple spanning tree region (MST region) is composed of multiple devices in a switched network and
network segments among them. These devices have the following characteristics:
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All are MSTP-enabled,
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They have the same region name,