112
Figure 28
Network diagram for monitor link configuration
Device A
Device D
Device B
GE
1/0
/1
GE
1/0
/2
GE
1/0
/1
GE
1/0
/1
GE
1/0
/2
GE
1/0
/2
Device C
GE
1/0
/1
GE
1/0
/2
Configuration procedure
1.
Configuration on Device C
# Create VLANs 1 through 30, map these VLANs to MSTI 1, and activate 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
# Disable STP on GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 separately, configure them as
trunk ports, and assign them to VLANs 1 through 30.
[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] port trunk permit vlan 1 to 30
[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] port trunk permit vlan 1 to 30
[DeviceC-GigabitEthernet1/0/2] quit
# Create smart link group 1, and configure all the VLANs mapped to MSTI 1 as the protected VLANs for
smart link group 1.
[DeviceC] smart-link group 1
[DeviceC-smlk-group1] protected-vlan reference-instance 1
# Configure GigabitEthernet 1/0/1 as the master port and GigabitEthernet 1/0/2 as the slave port for
smart link group 1.
[DeviceC-smlk-group1] port gigabitethernet 1/0/1 master
[DeviceC-smlk-group1] port gigabitethernet 1/0/2 slave
# Enable the smart link group to transmit flush messages.
[DeviceC-smlk-group1] flush enable
[DeviceC-smlk-group1] quit
2.
Configuration on Device A