Table 7-5 Differences between BPDUs
Version Type Name
0 0x00 Configuration BPDU
0 0x80 TCN BPDU
2 0x02 RST BPDU
3 0x02 MST BPDU
MST BPDU Format
Figure 7-9 shows the MST BPDU format.
Figure 7-9 MST BPDU format
Octet
1-2
3
4
5
6-13
14-17
18-25
26-27
28-29
30-31
32-33
34-35
36
37-38
39-89
90-93
94-101
102
103-39+Version
3 Length
Protocol Identifier
Protocol Version Identifier
BPDU Type
CIST Flags
CIST Root Identifier
CIST External Path Cost
CIST Regional Root Identifier
CIST Port Identifier
Message Age
Max Age
Hello Time
Forward Delay
Version 1 Length=0
Version 3 Length
MST Configuration Identifier
CIST Bridge Identifier
CIST Remaining Hops
MSTI Configuration Messages
(may be absent)
CIST Internal Root Path Cost
MST
special
fields
The first 36 bytes of an intra-region or inter-region MST BPDU are the same as those of an RST
BPDU.
Fields from the 37th byte of an MST BPDU are MSTP-specific. The field MSTI Configuration
Messages consists of configuration messages of multiple MSTIs.
Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching
7 MSTP Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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