Example: Configuring a single smart link group

As shown in Figure 38:

• Device C and Device D are Smart Link devices. Device A, Device B, and Device E are associated devices. Traffic of VLANs 1 through 30 on Device C and Device D is dually uplinked to Device A.

• Configure Smart Link on Device C and Device D for dual uplink backup.

	IMPORTANT: By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

1. Configure Device C:

   # Create VLANs 1 through 30.

   <DeviceC> system-view
   [DeviceC] vlan 1 to 30
   

   # Map these VLANs to MSTI 1.

   [DeviceC] stp region-configuration
   [DeviceC-mst-region] instance 1 vlan 1 to 30
   

   # Activate the MST region configuration.

   [DeviceC-mst-region] active region-configuration
   [DeviceC-mst-region] quit
   

   # Shut down FortyGigE 1/0/1.

   [DeviceC] interface fortygige 1/0/1
   [DeviceC-FortyGigE1/0/1] shutdown
   

   # Disable the spanning tree feature on the port.

   [DeviceC-FortyGigE1/0/1] undo stp enable
   

   # Configure the port as a trunk port.

   [DeviceC-FortyGigE1/0/1] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceC-FortyGigE1/0/1] port trunk permit vlan 1 to 30
   [DeviceC-FortyGigE1/0/1] quit
   

   # Configure FortyGigE 1/0/2 in the same way FortyGigE 1/0/1 is configured.

   [DeviceC] interface fortygige 1/0/2
   [DeviceC-FortyGigE1/0/2] shutdown
   [DeviceC-FortyGigE1/0/2] undo stp enable
   [DeviceC-FortyGigE1/0/2] port link-type trunk
   [DeviceC-FortyGigE1/0/2] port trunk permit vlan 1 to 30
   [DeviceC-FortyGigE1/0/2] quit
   

   # Create smart link group 1, and configure all VLANs mapped to MSTI 1 as the protected VLANs.

   [DeviceC] smart-link group 1
   [DeviceC-smlk-group1] protected-vlan reference-instance 1
   

   # Configure FortyGigE 1/0/1 as the primary port and as the secondary port for smart link group 1.

   [DeviceC-smlk-group1] port fortygige 1/0/1 primary
   [DeviceC-smlk-group1] port fortygige 1/0/2 secondary
   

   # Enable flush message sending in smart link group 1, and configure VLAN 10 as the transmit control VLAN.

   [DeviceC-smlk-group1] flush enable control-vlan 10
   [DeviceC-smlk-group1] quit
   

   # Bring up FortyGigE 1/0/1 and FortyGigE 1/0/2 again.

   [DeviceC] interface fortygige 1/0/1
   [DeviceC-FortyGigE1/0/1] undo shutdown
   [DeviceC-FortyGigE1/0/1] quit
   [DeviceC] interface fortygige 1/0/2
   [DeviceC-] undo shutdown
   [DeviceC-FortyGigE1/0/2] quit
   

2. Configure Device D:

   # Create VLANs 1 through 30.

   <DeviceD> system-view
   [DeviceD] vlan 1 to 30
   

   # Map these VLANs to MSTI 1.

   [DeviceD] stp region-configuration
   [DeviceD-mst-region] instance 1 vlan 1 to 30
   

   # Activate the MST region configuration.

   [DeviceD-mst-region] active region-configuration
   [DeviceD-mst-region] quit
   

   # Shut down .

   [DeviceD] interface fortygige 1/0/1
   [DeviceD-FortyGigE1/0/1] shutdown
   

   # Disable the spanning tree feature on the port.

   [DeviceD-FortyGigE1/0/1] undo stp enable
   

   # Configure the port as a trunk port.

   [DeviceD-FortyGigE1/0/1] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceD-FortyGigE1/0/1] port trunk permit vlan 1 to 30
   [DeviceD-FortyGigE1/0/1] quit
   

   # Configure FortyGigE 1/0/2 in the same way FortyGigE 1/0/1 is configured.

   [DeviceD] interface fortygige 1/0/2
   [DeviceD-FortyGigE1/0/2] shutdown
   [DeviceD-FortyGigE1/0/2] undo stp enable
   [DeviceD-FortyGigE1/0/2] port link-type trunk
   [DeviceD-] port trunk permit vlan 1 to 30
   [DeviceD-FortyGigE1/0/2] quit
   

   # Create smart link group 1, and configure all VLANs mapped to MSTI 1 as the protected VLANs.

   [DeviceD] smart-link group 1
   [DeviceD-smlk-group1] protected-vlan reference-instance 1
   

   # Configure FortyGigE 1/0/1 as the primary port and FortyGigE 1/0/2 as the secondary port for smart link group 1.

   [DeviceD-smlk-group1] port fortygige 1/0/1 primary
   [DeviceD-smlk-group1] port fortygige 1/0/2 secondary
   

   # Enable flush message sending in smart link group 1, and configure VLAN 20 as the transmit control VLAN.

   [DeviceD-smlk-group1] flush enable control-vlan 20
   [DeviceD-smlk-group1] quit
   

   # Bring up FortyGigE 1/0/1 and again.

   [DeviceD] interface fortygige 1/0/1
   [DeviceD-FortyGigE1/0/1] undo shutdown
   [DeviceD-] quit
   [DeviceD] interface fortygige 1/0/2
   [DeviceD-FortyGigE1/0/2] undo shutdown
   [DeviceD-FortyGigE1/0/2] quit
   

3. Configure Device B:

   # Create VLANs 1 through 30.

   <DeviceB> system-view
   [DeviceB] vlan 1 to 30
   

   # Configure FortyGigE 1/0/1 as a trunk port.

   [DeviceB] interface fortygige 1/0/1
   [DeviceB-FortyGigE1/0/1] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceB-] port trunk permit vlan 1 to 30
   

   # Enable flush message receiving and configure VLAN 10 and VLAN 20 as the receive control VLANs on the port.

   [DeviceB-FortyGigE1/0/1] smart-link flush enable control-vlan 10 20
   [DeviceB-FortyGigE1/0/1] quit
   

   # Configure FortyGigE 1/0/2 as a trunk port.

   [DeviceB] interface 
   [DeviceB-FortyGigE1/0/2] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceB-FortyGigE1/0/2] port trunk permit vlan 1 to 30
   

   # Disable the spanning tree feature on the port.

   [DeviceB-FortyGigE1/0/2] undo stp enable
   

   # Enable flush message receiving and configure VLAN 20 as the receive control VLAN on the port.

   [DeviceB-FortyGigE1/0/2] smart-link flush enable control-vlan 20
   [DeviceB-FortyGigE1/0/2] quit
   

   # Configure as a trunk port.

   [DeviceB] interface fortygige 1/0/3
   [DeviceB-FortyGigE1/0/3] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceB-FortyGigE1/0/3] port trunk permit vlan 1 to 30
   

   # Disable the spanning tree feature on the port.

   [DeviceB-FortyGigE1/0/3] undo stp enable
   

   # Enable flush message receiving and configure VLAN 10 as the receive control VLAN on the port.

   [DeviceB-FortyGigE1/0/3] smart-link flush enable control-vlan 10
   [DeviceB-] quit
   

4. Configure Device E:

   # Create VLANs 1 through 30.

   <DeviceE> system-view
   [DeviceE] vlan 1 to 30
   

   # Configure FortyGigE 1/0/1 as a trunk port.

   [DeviceE] interface fortygige 1/0/1
   [DeviceE-FortyGigE1/0/1] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceE-FortyGigE1/0/1] port trunk permit vlan 1 to 30
   

   # Enable flush message receiving and configure VLAN 10 and VLAN 20 as the receive control VLANs on the port.

   [DeviceE-FortyGigE1/0/1] smart-link flush enable control-vlan 10 20
   [DeviceE-FortyGigE1/0/1] quit
   

   # Configure FortyGigE 1/0/2 as a trunk port.

   [DeviceE] interface fortygige 1/0/2
   [DeviceE-FortyGigE1/0/2] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceE-FortyGigE1/0/2] port trunk permit vlan 1 to 30
   

   # Disable the spanning tree feature on the port.

   [DeviceE-FortyGigE1/0/2] undo stp enable
   

   # Enable flush message receiving and configure VLAN 10 as the receive control VLAN on the port.

   [DeviceE-FortyGigE1/0/2] smart-link flush enable control-vlan 10
   [DeviceE-FortyGigE1/0/2] quit
   

   # Configure as a trunk port.

   [DeviceE] interface fortygige 1/0/3
   [DeviceE-FortyGigE1/0/3] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceE-FortyGigE1/0/3] port trunk permit vlan 1 to 30
   

   # Disable the spanning tree feature on the port.

   [DeviceE-FortyGigE1/0/3] undo stp enable
   

   # Enable flush message receiving and configure VLAN 20 as the receive control VLAN on the port.

   [DeviceE-FortyGigE1/0/3] smart-link flush enable control-vlan 20
   [DeviceE-] quit
   

5. Configure Device A:

   # Create VLANs 1 through 30.

   <DeviceA> system-view
   [DeviceA] vlan 1 to 30
   

   # Configure FortyGigE 1/0/1 as a trunk port.

   [DeviceA] interface 
   [DeviceA-FortyGigE1/0/1] port link-type trunk
   

   # Assign the port to VLANs 1 through 30.

   [DeviceA-FortyGigE1/0/1] port trunk permit vlan 1 to 30
   

   # Enable flush message receiving and configure VLAN 10 and VLAN 20 as the receive control VLANs on the port.

   [DeviceA-FortyGigE1/0/1] smart-link flush enable control-vlan 10 20
   [DeviceA-FortyGigE1/0/1] quit
   

   # Configure FortyGigE 1/0/2 in the same way FortyGigE 1/0/1 is configured.

   [DeviceA] interface fortygige 1/0/2
   [DeviceA-FortyGigE1/0/2] port link-type trunk
   [DeviceA-FortyGigE1/0/2] port trunk permit vlan 1 to 30
   [DeviceA-FortyGigE1/0/2] smart-link flush enable control-vlan 10 20
   [DeviceA-FortyGigE1/0/2] quit
   

# Display the smart link group configuration on Device C.

[DeviceC] display smart-link group 1
Smart link group 1 information:
  Device ID       : 000f-e23d-5af0
  Preemption mode : None
  Preemption delay: 1(s)
  Control VLAN    : 10
  Protected VLAN  : Reference Instance 1

  Member                  Role      State   Flush-count     Last-flush-time
  -----------------------------------------------------------------------------
  FGE1/0/1                PRIMARY   ACTIVE  5               16:45:20 2012/04/21
  FGE1/0/2                SECONDARY STANDBY 1               16:37:20 2012/04/21

# Display the flush messages received on Device B.

[DeviceB] display smart-link flush
 Received flush packets                             : 5
 Receiving interface of the last flush packet       : FortyGigE1/0/3
 Receiving time of the last flush packet            : 16:50:21 2012/04/21
 Device ID of the last flush packet                 : 000f-e23d-5af0
 Control VLAN of the last flush packet              : 10