3Com 4210G Series Configuration Manual page 754

Figure 3-10 Network diagram for intersecting-ring load balancing configuration
Configuration procedure
1) Configuration on Device A
# Create VLANs 10 and 20, map VLAN 10 to MSTI 1 and VLAN 20 to MSTI 2, and activate MST region
configuration.
<DeviceA> system-view
[DeviceA] vlan 10
[DeviceA-vlan10] quit
[DeviceA] vlan 20
[DeviceA-vlan20] quit
[DeviceA] stp region-configuration
[DeviceA-mst-region] instance 1 vlan 10
[DeviceA-mst-region] instance 2 vlan 20
[DeviceA-mst-region] active region-configuration
[DeviceA-mst-region] quit
# Configure the suppression time of physical-link-state changes on GigabitEthernet 1/0/1 and
GigabitEthernet 1/0/2 as zero, disable STP, configure the two ports as trunk ports, remove them from
VLAN 1, and assign them to VLAN 10 and VLAN 20, and configure them to trust the 802.1p
precedence of the received packets.
[DeviceA] interface gigabitethernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] link-delay 0
[DeviceA-GigabitEthernet1/0/1] undo stp enable
[DeviceA-GigabitEthernet1/0/1] port link-type trunk
[DeviceA-GigabitEthernet1/0/1] undo port trunk permit vlan 1
[DeviceA-GigabitEthernet1/0/1] port trunk permit vlan 10 20
[DeviceA-GigabitEthernet1/0/1] qos trust dot1p
[DeviceA-GigabitEthernet1/0/1] quit
[DeviceA] interface gigabitethernet 1/0/2
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