Background: A company in Beijing established a headquarters in Guangzhou after the establishment of sub-centers, and in the provinces have established offices. Headquarters with R & D, marketing, supply chain, sale and other four departments, unified planning and allocation of IP and business resources. Company size and rapid development in 2016, traffic data and the company's huge growth in traffic. In order to better manage data, provide services, the company decided to build its own small data center and cloud computing services platform to achieve fast, reliable exchange of data, as well as the purpose of enhancing service deployment flexibility. Headquarters, a network set up sub-centers and offices (actual equipments) shown on the right topology. Wherein the two switches numbered S5800 S4, S5, high-speed access to the server; number two S3600V2 S2, S3, headquarters as core switches; MSR2630 two routers number R2, R3, headquarters as a core router; a S3600V2 station number as S1, headquarters as access switch; a router MSR2630 number R1, the router as an office. 
The following is an example of the configuration command s2
S2 configuration:
divide vlan
S2 to the port to trunk
int G1 / 0/20 is
Port Link-type trunk
domain MSTP region configurations is H3C, the vlan 105,15,25 respectively and
mapped to on MSTP 1,2,3, and configuration level 1.
Configuration-stpregion
Region H3C-name
instance1 VLAN 105
instance2 VLAN 15
instance3 VLAN 25
Revision Level. 1-
quit
active configuration area.
stp region-configuration
active region-configuration
quit
The main root S2 to Example 1
STP instance the root Primary 1
STP Global enable
configuration MSTP domain name is H3C, the vlan 35,45 and are mapped to the MSTP 1,2,
and 2 to the configuration level.
Activate the configuration area.
S2 from the root to Example 2
Protection STP loops arranged in global mode
spanning-tree portfast loopguard default
BPDU protection in global mode
spanning-tree portfast bdpuguard default