Mstp Basic Concepts - HP 5120 EI Series Lan Switching Configuration Manual

MSTP provides the following features:
• MSTP divides a switched network into multiple regions, each of which contains multiple spanning
trees that are independent of one another.
MSTP supports mapping VLANs to spanning tree instances by means of a VLAN-to-instance
•
mapping table. MSTP can reduce communication overheads and resource usage by mapping
multiple VLANs to one instance.
MSTP prunes a loop network into a loop-free tree, which avoids proliferation and endless cycling of
•
packets in a loop network. In addition, it supports load balancing of VLAN data by providing
multiple redundant paths for data forwarding.

MSTP basic concepts

Figure 20 shows a switched network that comprises four MST regions, each MST region comprising four
MSTP devices.
Figure 20 Basic concepts in MSTP
VLAN 1
VLAN 2
Other VLANs
MST region 1
MST region 2
VLAN 1
VLAN 2
Other VLANs
Figure 21 shows the networking topology of MST region 3.
MSTI 1
MSTI 2
MSTI 0
MSTI 1
MSTI 2
MSTI 0
VLAN 1
VLAN 2
Other VLANs
VLAN 1
CST
VLAN 2&3
Other VLANs
65
MSTI 1
MSTI 2
MSTI 0
MST region 4
MST region 3
MSTI 1
MSTI 2
MSTI 0