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Device C is the transit node of primary ring 1 and the assistant-edge node of subring 1, and
GigabitEthernet 1/0/3 is the edge port.
Device D is the transit node of primary ring 1, with GigabitEthernet 1/0/1 as the primary port and
GigabitEthernet 1/0/2 the secondary port.
Figure 21 Network diagram for intersecting rings configuration
Device A
Master node
Device D
Transit node
Domain 1
Ring 1
GE1/0/1
GE1/0/2
GE1/0/1
GE1/0/2
GE1/0/1
GE1/0/1
Device C
Assistant edge node
Device B
Edge node
Ring 2
GE1/0/3
GE1/0/3
GE1/0/1
GE1/0/2
Device E
Master node
GE1/0/2
GE1/0/2
Configuration procedure
1. Configure Device A.
# Create VLANs 1 through 30, map these VLANs to MSTI 1, and activate the MST region configuration.
<DeviceA> system-view
[DeviceA] vlan 1 to 30
[DeviceA] stp region-configuration
[DeviceA-mst-region] instance 1 vlan 1 to 30
[DeviceA-mst-region] active region-configuration
[DeviceA-mst-region] quit
# Disable physical state change suppression and STP on GigabitEthernet 1/0/1 and GigabitEthernet
1/0/2, and configure the two ports to trust the 802.1p precedence of the received packets. Configure the
two ports as trunk ports, and assign them to VLANs 1 through 30.
[DeviceA] interface gigabitethernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] undo link-delay
[DeviceA-GigabitEthernet1/0/1] undo stp enable
[DeviceA-GigabitEthernet1/0/1] qos trust dot1p
[DeviceA-GigabitEthernet1/0/1] port link-type trunk
[DeviceA-GigabitEthernet1/0/1] port trunk permit vlan 1 to 30
[DeviceA-GigabitEthernet1/0/1] quit
[DeviceA] interface gigabitethernet 1/0/2
[DeviceA-GigabitEthernet1/0/2] undo link-delay
[DeviceA-GigabitEthernet1/0/2] undo stp enable
[DeviceA-GigabitEthernet1/0/2] qos trust dot1p
[DeviceA-GigabitEthernet1/0/2] port link-type trunk
[DeviceA-GigabitEthernet1/0/2] port trunk permit vlan 1 to 30
[DeviceA-GigabitEthernet1/0/2] quit
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