1-29 
[DeviceB-rrpp-domain2] ring 1 node-mode transit primary-port gigabitethernet 1/0/1  
secondary-port gigabitethernet 1/0/2 level 0 
[DeviceB-rrpp-domain2] ring 1 enable 
# Configure Device B as the assistant-edge node of subring 2 in RRPP domain 2, with 
GigabitEthernet1/0/3 as the edge port, and enable subring 2.  
[DeviceB-rrpp-domain2] ring 2 node-mode assistant-edge edge-port gigabitethernet 1/0/3 
[DeviceB-rrpp-domain2] ring 2 enable 
[DeviceB-rrpp-domain2] quit 
# Enable RRPP.  
[DeviceB] rrpp enable 
3)  Configure Device C as the edge node of subrings Ring 2 and Ring 3 
# Create VLANs 10 and 20, and map VLAN 10 to MSTI 1 and VLAN 20 to MSTI 2.  
<DeviceC> system-view 
[DeviceC] vlan 10 
[DeviceC-vlan10] quit 
[DeviceC] vlan 20 
[DeviceC-vlan20] quit 
[DeviceC] stp region-configuration 
[DeviceC-mst-region] instance 1 vlan 10 
[DeviceC-mst-region] instance 2 vlan 20 
[DeviceC-mst-region] active region-configuration 
[DeviceC-mst-region] quit 
# Configure RRPP ports GigabitEthernet1/0/1, GigabitEthernet1/0/2, GigabitEthernet1/0/3, and 
GigabitEthernet1/0/4.  
[DeviceC] interface gigabitethernet 1/0/1 
[DeviceC-GigabitEthernet1/0/1] undo stp enable 
[DeviceC-GigabitEthernet1/0/1] port link-type trunk 
[DeviceC-GigabitEthernet1/0/1] undo port trunk permit vlan 1 
[DeviceC-GigabitEthernet1/0/1] port trunk permit vlan 10 20 
[DeviceC-GigabitEthernet1/0/1] qos trust dot1p 
[DeviceC-GigabitEthernet1/0/1] quit 
[DeviceC] interface gigabitethernet 1/0/2 
[DeviceC-GigabitEthernet1/0/2] undo stp enable 
[DeviceC-GigabitEthernet1/0/2] port link-type trunk 
[DeviceC-GigabitEthernet1/0/2] undo port trunk permit vlan 1 
[DeviceC-GigabitEthernet1/0/2] port trunk permit vlan 10 20 
[DeviceC-GigabitEthernet1/0/2] qos trust dot1p 
[DeviceC-GigabitEthernet1/0/2] quit 
[DeviceC] interface gigabitethernet 1/0/3 
[DeviceC-GigabitEthernet1/0/3] undo stp enable 
[DeviceC-GigabitEthernet1/0/3] port link-type trunk 
[DeviceC-GigabitEthernet1/0/3] undo port trunk permit vlan 1 
[DeviceC-GigabitEthernet1/0/3] port trunk permit vlan 20 
[DeviceC-GigabitEthernet1/0/3] qos trust dot1p 
[DeviceC-GigabitEthernet1/0/3] quit 
[DeviceC] interface gigabitethernet 1/0/4