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# Configure Device B as a transit node of primary ring 1, with GigabitEthernet 1/0/1 as the 
primary port and GigabitEthernet 1/0/2 as the secondary port, and enable ring 1.  
[DeviceB-rrpp-domain1] ring 1 node-mode transit primary-port gigabitethernet 1/0/1 
secondary-port gigabitethernet 1/0/2 level 0 
[DeviceB-rrpp-domain1] ring 1 enable 
# Configure Device B as the edge node of subring 2, with GigabitEthernet 1/0/3 as the edge port, 
and enable ring 2.  
[DeviceB-rrpp-domain1] ring 2 node-mode edge edge-port gigabitethernet 1/0/3 
[DeviceB-rrpp-domain1] ring 2 enable 
[DeviceB-rrpp-domain1] quit 
# Enable RRPP.  
[DeviceB] rrpp enable 
3.  Configure Device C: 
# Create VLANs 1 through 30, map these VLANs to MSTI 1, and activate the MST region 
configuration. 
<DeviceC> system-view 
[DeviceC] vlan 1 to 30 
[DeviceC] stp region-configuration 
[DeviceC-mst-region] instance 1 vlan 1 to 30 
[DeviceC-mst-region] active region-configuration 
[DeviceC-mst-region] quit 
# Cancel the physical state change suppression interval setting on GigabitEthernet 1/0/1, 
GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3, disable the spanning tree feature, and set 
the trusted packet priority type to 802.1p priority. Configure the three ports as trunk ports, and 
assign them to VLANs 1 through 30.  
[DeviceC] interface gigabitethernet 1/0/1 
[DeviceC-GigabitEthernet1/0/1] undo link-delay 
[DeviceC-GigabitEthernet1/0/1] undo stp enable 
[DeviceC-GigabitEthernet1/0/1] qos trust dot1p 
[DeviceC-GigabitEthernet1/0/1] port link-type trunk 
[DeviceC-GigabitEthernet1/0/1] port trunk permit vlan 1 to 30 
[DeviceC-GigabitEthernet1/0/1] quit 
[DeviceC] interface gigabitethernet 1/0/2 
[DeviceC-GigabitEthernet1/0/2] undo link-delay 
[DeviceC-GigabitEthernet1/0/2] undo stp enable 
[DeviceC-GigabitEthernet1/0/2] qos trust dot1p 
[DeviceC-GigabitEthernet1/0/2] port link-type trunk 
[DeviceC-GigabitEthernet1/0/2] port trunk permit vlan 1 to 30 
[DeviceC-GigabitEthernet1/0/2] quit 
[DeviceC] interface gigabitethernet 1/0/3 
[DeviceC-GigabitEthernet1/0/3] undo link-delay 
[DeviceC-GigabitEthernet1/0/3] undo stp enable 
[DeviceC-GigabitEthernet1/0/3] qos trust dot1p 
[DeviceC-GigabitEthernet1/0/3] port link-type trunk 
[DeviceC-GigabitEthernet1/0/3] port trunk permit vlan 1 to 30 
[DeviceC-GigabitEthernet1/0/3] quit 
# Create RRPP domain 1. Configure VLAN 4092 as the primary control VLAN of RRPP domain 1, 
and configure VLANs mapped to MSTI 1 as the protected VLANs of RRPP domain 1.