The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of Smart Link, Monitor Link, and IRF.

General restrictions and guidelines

If you configure a port as both an aggregation group member and a smart link group member, only the aggregation group configuration takes effect. The port is not shown in the output from the display smart-link group command.

Example: Configuring Smart Link load sharing

Network configuration

As shown in Figure 1, VLAN 10 and VLAN 11 are assigned to the Finance department and the Marketing department of an enterprise, respectively. Traffic of VLAN 10 and VLAN 11 on Device A is dually uplinked to Device D by Device B and Device C. Configure Smart Link to meet the following requirements:

· When the link between Device A and Device B and the link between Device A and Device C are both available, the traffic of the Finance department is forwarded trough the link between Device A and Device B. The traffic of the Marketing department is forwarded through the link between Device A and Device C.

· When one link fails, the traffic on the link is switched to another link. When the link recovers, the traffic is switched back to the link.

Figure 1 Network diagram

Device	Interface	VLAN	Device	Interface	VLAN
Device A	GE1/0/1	10, 11	Device C	GE1/0/1	10, 11
	GE1/0/2	10, 11	Device C	GE1/0/2	10, 11
	GE1/0/3	10	Device D	GE1/0/1	10, 11
	GE1/0/4	11		GE1/0/2	10, 11
Device B	GE1/0/1	10, 11		GE1/0/3	10, 11
Device B	GE1/0/2	10, 11

Analysis

To implement load sharing on the two uplinks, create two smart link groups with the same member ports on Device A. The role of each port must be different in the two smart link groups. Use the VLANs of the Finance department and Marketing department as the protected VLANs of the corresponding smart link groups.

For the traffic to switch back to the recovered link, enable role preemption for the two smart link groups.

For the upstream device to refresh MAC address entries and ARP/ND entries when link switchover occurs in a smart link group, perform the following tasks:

· Enable flush message sending on Device A.

· Enable flush message receiving on ports of the primary and secondary links from Device A to Device D.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F switch	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C switch MS4520V2-54C switch	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S switch MS4520V2-24TP switch	Release 63xx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (excluding S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (excluding S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Not supported
S5000V3-EI switch series S5000V5-EI switch series	Not supported
S5000E-X switch series S5000X-EI switch series	Not supported
E128C switch E152C switch E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC switch IE4300-12P-PWR switch IE4300-M switch series IE4320 switch series	Release 63xx

Restrictions and guidelines

When you configure Smart Link load sharing, follow these restrictions and guidelines:

· Before you configure a port as a smart link group member, shut down the port to prevent loops. You can bring up the port only after completing the smart link group configuration.

· Before you configure a smart link group member port or its directly connected port, disable the spanning tree feature and RRPP on the port.

· Make sure the receive control VLAN configured on the upstream device is the same as the transmit control VLAN configured on the smart link device.

· The control VLAN configured for a smart link group must be different from the control VLAN configured for any other smart link groups.

· The control VLAN of a smart link group must also be one of its protected VLANs. Do not remove the control VLAN. Otherwise, flush messages cannot be sent correctly.

Procedures

Configuring Device A

1. Create VLAN 10 and VLAN 11.

<DeviceA> system-view

[DeviceA] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

# Shut down GigabitEthernet 1/0/1.

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] shutdown

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

[DeviceA-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceA-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceA-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceA-GigabitEthernet1/0/1] undo stp enable

[DeviceA-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2 in the same way GigabitEthernet 1/0/1 is configured.

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] shutdown

[DeviceA-GigabitEthernet1/0/2] port link-type trunk

[DeviceA-GigabitEthernet1/0/2] port trunk permit vlan 10 11

[DeviceA-GigabitEthernet1/0/2] undo port trunk permit vlan 1

[DeviceA-GigabitEthernet1/0/2] undo stp enable

[DeviceA-GigabitEthernet1/0/2] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as an access port and assign the port to VLAN 10.

[DeviceA] interface gigabitethernet 1/0/3

[DeviceA-GigabitEthernet1/0/3] port access vlan 10

# Bring up the port.

[DeviceA-GigabitEthernet1/0/3] undo shutdown

[DeviceA-GigabitEthernet1/0/3] quit

5. Configure GigabitEthernet 1/0/4:

# Configure GigabitEthernet 1/0/4 as an access port and assign the port to VLAN 11.

[DeviceA] interface gigabitethernet 1/0/4

[DeviceA-GigabitEthernet1/0/4] port access vlan 11

# Bring up the port.

[DeviceA-GigabitEthernet1/0/4] undo shutdown

[DeviceA-GigabitEthernet1/0/4] quit

6. Configure VLAN-to-MSTI mappings and activate the MST region configuration:

# Enter MST region view.

[DeviceA] stp region-configuration

# Map VLAN 10 to MSTI 1, and VLAN 11 to MSTI 2.

[DeviceA-mst-region] instance 1 vlan 10

[DeviceA-mst-region] instance 2 vlan 11

# Activate the MST region configuration.

[DeviceA-mst-region] active region-configuration

[DeviceA-mst-region] quit

7. Configure smart link group 1:

# Create smart link group 1 and configure the VLAN mapped to MSTI 1, VLAN 10, as the protected VLAN.

[DeviceA] smart-link group 1

[DeviceA-smlk-group1] protected-vlan reference-instance 1

# Configure GigabitEthernet 1/0/1 as the primary port and GigabitEthernet 1/0/2 as the secondary port.

[DeviceA-smlk-group1] port gigabitethernet 1/0/1 primary

[DeviceA-smlk-group1] port gigabitethernet 1/0/2 secondary

# Enable flush message sending, and configure VLAN 10 as the transmit control VLAN.

[DeviceA-smlk-group1] flush enable control-vlan 10

# Enable role preemption and set the preemption delay to 10 seconds.

[DeviceA-smlk-group1] preemption mode role

[DeviceA-smlk-group1] preemption delay 10

[DeviceA-smlk-group1] quit

8. Configure smart link group 2:

# Create smart link group 2 and configure the VLAN mapped to MSTI 2, VLAN 11, as the protected VLAN.

[DeviceA] smart-link group 2

[DeviceA-smlk-group2] protected-vlan reference-instance 2

# Configure GigabitEthernet 1/0/2 as the primary port and GigabitEthernet 1/0/1 as the secondary port.

[DeviceA-smlk-group2] port gigabitethernet 1/0/2 primary

[DeviceA-smlk-group2] port gigabitethernet 1/0/1 secondary

# Enable flush message sending, and configure VLAN 11 as the transmit control VLAN.

[DeviceA-smlk-group2] flush enable control-vlan 11

# Enable role preemption and set the preemption delay to 10 seconds.

[DeviceA-smlk-group2] preemption mode role

[DeviceA-smlk-group2] preemption delay 10

[DeviceA-smlk-group2] quit

9. Bring up GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2:

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] undo shutdown

[DeviceA-GigabitEthernet1/0/1] quit

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] undo shutdown

[DeviceA-GigabitEthernet1/0/2] quit

Configuring Device B

1. Create VLAN 10 and VLAN 11.

<DeviceB> system-view

[DeviceB] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceB] interface gigabitethernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceB-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceB-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceB-GigabitEthernet1/0/1] undo stp enable

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceB-GigabitEthernet1/0/1] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceB-GigabitEthernet1/0/1] undo shutdown

[DeviceB-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2:

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

[DeviceB] interface gigabitethernet 1/0/2

[DeviceB-GigabitEthernet1/0/2] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceB-GigabitEthernet1/0/2] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceB-GigabitEthernet1/0/2] undo port trunk permit vlan 1

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceB-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceB-GigabitEthernet1/0/2] undo shutdown

[DeviceB-GigabitEthernet1/0/2] quit

Configuring Device C

1. Create VLAN 10 and VLAN 11.

<DeviceC> system-view

[DeviceC] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceC] interface gigabitethernet 1/0/1

[DeviceC-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceC-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceC-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceC-GigabitEthernet1/0/1] undo stp enable

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceC-GigabitEthernet1/0/1] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceC-GigabitEthernet1/0/1] undo shutdown

[DeviceC-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2:

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

[DeviceC] interface gigabitethernet 1/0/2

[DeviceC-GigabitEthernet1/0/2] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceC-GigabitEthernet1/0/2] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceC-GigabitEthernet1/0/2] undo port trunk permit vlan 1

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceC-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceC-GigabitEthernet1/0/2] undo shutdown

[DeviceC-GigabitEthernet1/0/2] quit

Configuring Device D

1. Create VLAN 10 and VLAN 11.

<DeviceD> system-view

[DeviceD] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceD] interface gigabitethernet 1/0/1

[DeviceD-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceD-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceD-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceD-GigabitEthernet1/0/1] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceD-GigabitEthernet1/0/1] undo shutdown

[DeviceD-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2 in the same way GigabitEthernet 1/0/1 is configured.

[DeviceD] interface gigabitethernet 1/0/2

[DeviceD-GigabitEthernet1/0/2] port link-type trunk

[DeviceD-GigabitEthernet1/0/2] port trunk permit vlan 10 11

[DeviceD-GigabitEthernet1/0/2] undo port trunk permit vlan 1

[DeviceD-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

[DeviceD-GigabitEthernet1/0/2] undo shutdown

[DeviceD-GigabitEthernet1/0/2] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as a trunk port

[DeviceD] interface gigabitethernet 1/0/3

[DeviceD-GigabitEthernet1/0/3] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceD-GigabitEthernet1/0/3] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceD-GigabitEthernet1/0/3] undo port trunk permit vlan 1

# Bring up the port.

[DeviceD-GigabitEthernet1/0/3] undo shutdown

[DeviceD-GigabitEthernet1/0/3] quit

Verifying the configuration

1. Verify the smart link group configuration when Device A is operating correctly:

# Display information about all smart link groups on Device A.

[DeviceA] display smart-link group all

Smart link group 1 information:

Device ID : 0000-fc00-2500

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 10

Protected VLAN : Reference Instance 1

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY ACTIVE 0 NA

GE1/0/2 SECONDARY STANDBY 2 16:22:40 2019/10/29

Smart link group 2 information:

Device ID : 0000-fc00-2500

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 11

Protected VLAN : Reference Instance 2

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/2 PRIMARY ACTIVE 2 16:22:40 2019/10/29

GE1/0/1 SECONDARY STANDBY 0 NA

The output shows the following information:

¡ In smart link group 1, the primary port GigabitEthernet 1/0/1 is active to transmit traffic from VLAN 10.

¡ In smart link group 2, the primary port GigabitEthernet 1/0/2 is active to transmit traffic from VLAN 11.

2. Verify the smart link group configuration when GigabitEthernet 1/0/1 on Device A is down:

# Display information about all smart link groups on Device A.

[DeviceA] display smart-link group all

Smart link group 1 information:

Device ID : 0000-fc00-2500

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 10

Protected VLAN : Reference Instance 1

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY DOWN 0 NA

GE1/0/2 SECONDARY ACTIVE 3 16:43:06 2019/10/29

Smart link group 2 information:

Device ID : 0000-fc00-2500

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 11

Protected VLAN : Reference Instance 2

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/2 PRIMARY ACTIVE 2 16:22:40 2019/10/29

GE1/0/1 SECONDARY DOWN 0 NA

The output shows the following information:

¡ In smart link group 1, the secondary port GigabitEthernet 1/0/2 is active to transmit traffic from VLAN 10.

¡ In smart link group 2, the primary port GigabitEthernet 1/0/2 remains active to transmit traffic from VLAN 11.

# Display information about the received flush messages on Device B.

[DeviceB] display smart-link flush

Received flush packets : 1

Receiving interface of the last flush packet : GigabitEthernet1/0/2

Receiving time of the last flush packet : 16:43:08 2019/10/29

Device ID of the last flush packet : 0000-fc00-2500

Control VLAN of the last flush packet : 10

Configuration files

NOTE:

Support for the port link-mode bridge command depends on the device model.

· Device A:

vlan 1

vlan 10 to 11

stp region-configuration

instance 1 vlan 10

instance 2 vlan 11

active region-configuration

smart-link group 1

preemption mode role

preemption delay 10

flush enable control-vlan 10

protected-vlan reference-instance 1

smart-link group 2

preemption mode role

preemption delay 10

flush enable control-vlan 11

protected-vlan reference-instance 2

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

port smart-link group 1 primary

port smart-link group 2 secondary

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

port smart-link group 1 secondary

port smart-link group 2 primary

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 10

interface GigabitEthernet1/0/4

port link-mode bridge

port access vlan 11

· Device B:

vlan 1

vlan 10 to 11

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

· Device C:

vlan 1

vlan 10 to 11

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

· Device D:

vlan 1

vlan 10 to 11

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/3

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

Example: Configuring Smart Link and Monitor Link collaboration

Network configuration

As shown in Figure 2, VLAN 10 and VLAN 11 are assigned to Zone A and Zone B, respectively. Traffic of VLAN 10 is dually uplinked from Device A to Device E by Device C and Device D. Traffic of VLAN 11 is dually uplinked from Device B to Device E by Device C and Device D. Configure Smart Link and Monitor Link to meet the following requirements:

· When the link between Device A and Device C and the link between Device A and Device D are both available, the traffic of Zone A is forwarded trough the link between Device A and Device C. When the link between Device A and Device C fails, the traffic is switched to the link between Device A and Device D. When the link between Device A and Device C recovers, the traffic switches back to the link.

· When the link between Device B and Device C and the link between Device B and Device D are both available, the traffic of Zone B is forwarded trough the link between Device B and Device D. When the link between Device B and Device D fails, the traffic is switched to the link between Device B and Device C. When the link between Device B and Device D recovers, the traffic switches back to the link.

· Configure Monitor Link on Device C and Device D to associate the state of downlink interfaces with the state of uplink interfaces. When Monitor link shuts down the downlink interfaces because of an uplink failure, Smart Link triggers a link switchover.

Figure 2 Network diagram

Device	Interface	VLAN	Device	Interface	VLAN
Device A	GE1/0/1	10	Device D	GE1/0/1	11
	GE1/0/2	10		GE1/0/2	10, 11
	GE1/0/3	10		GE1/0/3	10
Device B	GE1/0/1	11	Device E	GE1/0/1	10, 11
	GE1/0/2	11		GE1/0/2	10, 11
	GE1/0/3	11		GE1/0/3	10, 11
Device C	GE1/0/1	10
	GE1/0/2	10, 11
	GE1/0/3	11

Analysis

To implement dual uplink backup on Device A and Device B, perform the following tasks:

· Create a smart link group on Device A and Device B, respectively.

· Configure the VLANs of Zone A and Zone B as the protected VLANs of the corresponding smart link groups.

For the traffic to switch back to the recovered link, enable role preemption for the two smart link groups.

For the upstream device to refresh MAC address forwarding entries and ARP/ND entries when link switchover occurs in a smart link group, perform the following tasks:

· Enable flush message sending on Device A and Device B.

· Enable flush message receiving on the downlink ports on Device C and Device D.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F switch	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C switch MS4520V2-54C switch	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S switch MS4520V2-24TP switch	Release 63xx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (excluding S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (excluding S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Not supported
S5000V3-EI switch series S5000V5-EI switch series	Not supported
S5000E-X switch series S5000X-EI switch series	Not supported
E128C switch E152C switch E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC switch IE4300-12P-PWR switch IE4300-M switch series IE4320 switch series	Release 63xx

Restrictions and guidelines

When you configure Smart Link and Monitor Link collaboration, follow these restrictions and guidelines:

· Before you configure a port as a smart link group member, shut down the port to prevent loops. You can bring up the port only after completing the smart link group configuration.

· Before you configure a smart link group member port or its directly connected port, disable the spanning tree feature and RRPP on the port.

· Make sure the receive control VLAN configured on the upstream device is the same as the transmit control VLAN configured on the smart link device.

· The control VLAN configured for a smart link group must be different from the control VLAN configured for any other smart link groups.

· The control VLAN of a smart link group must also be one of its protected VLANs. Do not remove the control VLAN. Otherwise, flush messages cannot be sent correctly.

· You can assign a port to only one monitor link group.

· Do not use the shutdown command or the undo shutdown command to change the state of the downlink interfaces in a monitor link group.

Procedures

Configuring Device A

1. Create VLAN 10 and VLAN 11.

<DeviceA> system-view

[DeviceA] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

# Shut down GigabitEthernet 1/0/1.

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] shutdown

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

[DeviceA-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10.

[DeviceA-GigabitEthernet1/0/1] port trunk permit vlan 10

# Remove the port from VLAN 1.

[DeviceA-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceA-GigabitEthernet1/0/1] undo stp enable

[DeviceA-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2 in the same way GigabitEthernet 1/0/1 is configured.

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] shutdown

[DeviceA-GigabitEthernet1/0/2] port link-type trunk

[DeviceA-GigabitEthernet1/0/2] port trunk permit vlan 10

[DeviceA-GigabitEthernet1/0/2] undo port trunk permit vlan 1

[DeviceA-GigabitEthernet1/0/2] undo stp enable

[DeviceA-GigabitEthernet1/0/2] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as an access port and assign the port to VLAN 10.

[DeviceA] interface gigabitethernet 1/0/3

[DeviceA-GigabitEthernet1/0/3] port access vlan 10

# Bring up the port.

[DeviceA-GigabitEthernet1/0/3] undo shutdown

[DeviceA-GigabitEthernet1/0/3] quit

5. Configure VLAN-to-MSTI mappings and activate the MST region configuration:

# Enter MST region view.

[DeviceA] stp region-configuration

# Map VLAN 10 to MSTI 1.

[DeviceA-mst-region] instance 1 vlan 10

# Activate the MST region configuration.

[DeviceA-mst-region] active region-configuration

[DeviceA-mst-region] quit

6. Configure smart link group 1:

# Create smart link group 1 and configure the VLAN mapped to MSTI 1, VLAN 10, as the protected VLAN.

[DeviceA] smart-link group 1

[DeviceA-smlk-group1] protected-vlan reference-instance 1

# Configure GigabitEthernet 1/0/1 as the primary port and GigabitEthernet 1/0/2 as the secondary port.

[DeviceA-smlk-group1] port gigabitethernet 1/0/1 primary

[DeviceA-smlk-group1] port gigabitethernet 1/0/2 secondary

# Enable flush message sending, and configure VLAN 10 as the transmit control VLAN.

[DeviceA-smlk-group1] flush enable control-vlan 10

# Enable role preemption and set the preemption delay to 10 seconds.

[DeviceA-smlk-group1] preemption mode role

[DeviceA-smlk-group1] preemption delay 10

[DeviceA-smlk-group1] quit

7. Bring up GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2:

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] undo shutdown

[DeviceA-GigabitEthernet1/0/1] quit

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] undo shutdown

[DeviceA-GigabitEthernet1/0/2] quit

Configuring Device B

1. Create VLAN 10 and VLAN 11.

<DeviceB> system-view

[DeviceB] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

# Shut down GigabitEthernet 1/0/1.

[DeviceB] interface gigabitethernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] shutdown

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

[DeviceB-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 11.

[DeviceB-GigabitEthernet1/0/1] port trunk permit vlan 11

# Remove the port from VLAN 1.

[DeviceB-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceB-GigabitEthernet1/0/1] undo stp enable

[DeviceB-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2 in the same way GigabitEthernet 1/0/1 is configured.

[DeviceB] interface gigabitethernet 1/0/2

[DeviceB-GigabitEthernet1/0/2] shutdown

[DeviceB-GigabitEthernet1/0/2] port link-type trunk

[DeviceB-GigabitEthernet1/0/2] port trunk permit vlan 11

[DeviceB-GigabitEthernet1/0/2] undo port trunk permit vlan 1

[DeviceB-GigabitEthernet1/0/2] undo stp enable

[DeviceB-GigabitEthernet1/0/2] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as an access port and assign the port to VLAN 11.

[DeviceB] interface gigabitethernet 1/0/3

[DeviceB-GigabitEthernet1/0/3] port access vlan 11

# Bring up the port.

[DeviceB-GigabitEthernet1/0/3] undo shutdown

[DeviceB-GigabitEthernet1/0/3] quit

5. Configure VLAN-to-MSTI mappings and activate the MST region configuration:

# Enter MST region view.

[DeviceB] stp region-configuration

# Map VLAN 11 to MSTI 1.

[DeviceB-mst-region] instance 1 vlan 11

# Activate the MST region configuration

[DeviceB-mst-region] active region-configuration

[DeviceB-mst-region] quit

6. Configure smart link group 1.

# Create smart link group 1 and configure the VLAN mapped to MSTI 1, VLAN 11, as the protected VLAN.

[DeviceB] smart-link group 1

[DeviceB-smlk-group1] protected-vlan reference-instance 1

# Configure GigabitEthernet 1/0/1 as the primary port and GigabitEthernet 1/0/2 as the secondary port.

[DeviceB-smlk-group1] port gigabitethernet 1/0/1 primary

[DeviceB-smlk-group1] port gigabitethernet 1/0/2 secondary

# Enable flush message sending, and configure VLAN 11 as the transmit control VLAN.

[DeviceA-smlk-group1] flush enable control-vlan 11

# Enable role preemption and set the preemption delay to 10 seconds.

[DeviceB-smlk-group1] preemption mode role

[DeviceB-smlk-group1] preemption delay 10

[DeviceB-smlk-group1] quit

7. Bring up GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2:

[DeviceB] interface gigabitethernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] undo shutdown

[DeviceB-GigabitEthernet1/0/1] quit

[DeviceB] interface gigabitethernet 1/0/2

[DeviceB-GigabitEthernet1/0/2] undo shutdown

[DeviceB-GigabitEthernet1/0/2] quit

Configuring Device C

1. Create VLAN 10 and VLAN 11.

<DeviceC> system-view

[DeviceC] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceC] interface gigabitethernet 1/0/1

[DeviceC-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10.

[DeviceC-GigabitEthernet1/0/1] port trunk permit vlan 10

# Remove the port from VLAN 1.

[DeviceC-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceC-GigabitEthernet1/0/1] undo stp enable

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

[DeviceC-GigabitEthernet1/0/1] smart-link flush enable control-vlan 10

# Bring up the port.

[DeviceC-GigabitEthernet1/0/1] undo shutdown

[DeviceC-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2:

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

[DeviceC] interface gigabitethernet 1/0/2

[DeviceC-GigabitEthernet1/0/2] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceC-GigabitEthernet1/0/2] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceC-GigabitEthernet1/0/2] undo port trunk permit vlan 1

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceC-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceC-GigabitEthernet1/0/2] undo shutdown

[DeviceC-GigabitEthernet1/0/2] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as a trunk port.

[DeviceC] interface gigabitethernet 1/0/3

[DeviceC-GigabitEthernet1/0/3] port link-type trunk

# Assign the port to VLAN 11.

[DeviceC-GigabitEthernet1/0/3] port trunk permit vlan 11

# Remove the port from VLAN 1.

[DeviceC-GigabitEthernet1/0/3] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceC-GigabitEthernet1/0/3] undo stp enable

# Enable flush message receiving and configure VLAN 11 as the receive control VLAN on the port.

[DeviceC-GigabitEthernet1/0/3] smart-link flush enable control-vlan 11

# Bring up the port.

[DeviceB-GigabitEthernet1/0/3] undo shutdown

[DeviceB-GigabitEthernet1/0/3] quit

5. Configure monitor link group 1:

# Create monitor link group 1.

[DeviceC] monitor-link group 1

# Configure the uplink interface threshold for triggering monitor link group state switchover as 1.

[DeviceC-mtlk-group1] uplink up-port-threshold 1

# Configure GigabitEthernet 1/0/2 as the uplink port and GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3 as the downlink ports.

[DeviceC-mtlk-group1] port gigabitethernet 1/0/2 uplink

[DeviceC-mtlk-group1] port gigabitethernet 1/0/1 downlink

[DeviceC-mtlk-group1] port gigabitethernet 1/0/3 downlink

[DeviceC-mtlk-group1] quit

Configuring Device D

1. Create VLAN 10 and VLAN 11.

<DeviceD> system-view

[DeviceD] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceD] interface gigabitethernet 1/0/1

[DeviceD-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 11.

[DeviceD-GigabitEthernet1/0/1] port trunk permit vlan 11

# Remove the port from VLAN 1.

[DeviceD-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceD-GigabitEthernet1/0/1] undo stp enable

# Enable flush message receiving and configure VLAN 11 as the receive control VLAN on the port.

[DeviceD-GigabitEthernet1/0/1] smart-link flush enable control-vlan 11

# Bring up the port.

[DeviceD-GigabitEthernet1/0/1] undo shutdown

[DeviceD-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2:

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

[DeviceD] interface gigabitethernet 1/0/2

[DeviceD-GigabitEthernet1/0/2] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceD-GigabitEthernet1/0/2] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceD-GigabitEthernet1/0/2] undo port trunk permit vlan 1

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceD-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceD-GigabitEthernet1/0/2] undo shutdown

[DeviceD-GigabitEthernet1/0/2] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as a trunk port.

[DeviceD] interface gigabitethernet 1/0/3

[DeviceD-GigabitEthernet1/0/3] port link-type trunk

# Assign the port to VLAN 10.

[DeviceD-GigabitEthernet1/0/3] port trunk permit vlan 10

# Remove the port from VLAN 1.

[DeviceD-GigabitEthernet1/0/3] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceD-GigabitEthernet1/0/3] undo stp enable

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

[DeviceD-GigabitEthernet1/0/3] smart-link flush enable control-vlan 10

# Bring up the port.

[DeviceD-GigabitEthernet1/0/3] undo shutdown

[DeviceD-GigabitEthernet1/0/3] quit

5. Configure monitor link group 1:

# Create monitor link group 1.

[DeviceD] monitor-link group 1

# Configure the uplink interface threshold for triggering monitor link group state switchover as 1.

[DeviceD-mtlk-group1] uplink up-port-threshold 1

# Configure GigabitEthernet 1/0/2 as the uplink port and GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3 as the downlink ports.

[DeviceD-mtlk-group1] port gigabitethernet 1/0/2 uplink

[DeviceD-mtlk-group1] port gigabitethernet 1/0/1 downlink

[DeviceD-mtlk-group1] port gigabitethernet 1/0/3 downlink

[DeviceD-mtlk-group1] quit

Configuring Device E

1. Create VLAN 10 and VLAN 11.

<DeviceE> system-view

[DeviceE] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceE] interface gigabitethernet 1/0/1

[DeviceE-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceE-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceE-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceE-GigabitEthernet1/0/1] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceE-GigabitEthernet1/0/1] undo shutdown

[DeviceE-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2 in the same way GigabitEthernet 1/0/1 is configured.

[DeviceE] interface gigabitethernet 1/0/2

[DeviceE-GigabitEthernet1/0/2] port link-type trunk

[DeviceE-GigabitEthernet1/0/2] port trunk permit vlan 10 11

[DeviceE-GigabitEthernet1/0/2] undo port trunk permit vlan 1

[DeviceE-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

[DeviceE-GigabitEthernet1/0/2] undo shutdown

[DeviceE-GigabitEthernet1/0/2] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as a trunk port.

[DeviceE] interface gigabitethernet 1/0/3

[DeviceE-GigabitEthernet1/0/3] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceE-GigabitEthernet1/0/3] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceE-GigabitEthernet1/0/3] undo port trunk permit vlan 1

# Bring up the port.

[DeviceE-GigabitEthernet1/0/3] undo shutdown

[DeviceE-GigabitEthernet1/0/3] quit

Verifying the configuration

1. Verify the smart link group configuration when Device A and Device B are operating correctly:

# Display information about all smart link groups on Device A.

[DeviceA] display smart-link group all

Smart link group 1 information:

Device ID : 0000-fc00-2500

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 10

Protected VLAN : Reference Instance 1

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY ACTIVE 1 17:37:49 2019/10/29

GE1/0/2 SECONDARY STANDBY 3 17:43:06 2019/10/29

The output shows that in smart link group 1, the primary port GigabitEthernet 1/0/1 is active to transmit traffic from VLAN 10.

# Display information about all smart link groups on Device B.

[DeviceB] display smart-link group all

Smart link group 1 information:

Device ID : 0000-fc01-2501

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 11

Protected VLAN : Reference Instance 2

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY ACTIVE 2 17:22:40 2019/10/29

GE1/0/2 SECONDARY STANDBY 0 NA

The output shows that in smart link group 1, the primary port GigabitEthernet 1/0/1 is active to transmit traffic from VLAN 11.

2. Verify the monitor link group configuration when Device C and Device D are operating correctly:

# Display information about all monitor link groups on Device C.

[DeviceC] display monitor-link group all

Monitor link group 1 information:

Group status : UP

Downlink up-delay: 0(s)

Last-up-time : 17:07:26 2019/10/29

Last-down-time : -

Up-port-threshold: 1

Member Role Status

--------------------------------------------

GE1/0/2 UPLINK UP

GE1/0/1 DOWNLINK UP

GE1/0/3 DOWNLINK UP

The output shows that in monitor link group 1, the uplink port GigabitEthernet 1/0/2 is up, and the downlink ports GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3 are up.

# Display information about all monitor link groups on Device D.

[DeviceD] display monitor-link group all

Monitor link group 1 information:

Group status : UP

Downlink up-delay: 0(s)

Last-up-time : 17:09:33 2019/10/29

Last-down-time : -

Up-port-threshold: 1

Member Role Status

--------------------------------------------

GE1/0/2 UPLINK UP

GE1/0/1 DOWNLINK UP

The output shows that in monitor link group 1, the uplink port GigabitEthernet 1/0/2 is up, and the downlink ports GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3 are up.

3. Verify the smart link group configuration when GigabitEthernet 1/0/1 on Device A is down:

# Display information about all smart link groups on Device A.

[DeviceA] display smart-link group all

Smart link group 1 information:

Device ID : 0000-fc00-2500

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 10

Protected VLAN : Reference Instance 1

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY DOWN 1 17:37:49 2019/10/29

GE1/0/2 SECONDARY ACTIVE 4 17:49:06 2019/10/29

The output shows that in smart link group 1, the secondary port GigabitEthernet 1/0/2 is active to transmit traffic from VLAN 10.

# Display information about the received flush messages on Device C.

[DeviceC] display smart-link flush

Received flush packets : 1

Receiving interface of the last flush packet : GigabitEthernet1/0/2

Receiving time of the last flush packet : 17:49:08 2019/10/29

Device ID of the last flush packet : 0000-fc00-2500

Control VLAN of the last flush packet : 10

4. Verify the monitor link group configuration when the uplink port GigabitEthernet 1/0/2 on Device C is down:

# Display information about all monitor link groups on Device C.

[DeviceC] display monitor-link group all

Monitor link group 1 information:

Group status : DOWN

Downlink up-delay: 0(s)

Last-up-time : 17:07:26 2019/10/29

Last-down-time : 18:01:05 2019/10/29

Up-port-threshold: 1

Member Role Status

--------------------------------------------

GE1/0/2 UPLINK DOWN

GE1/0/1 DOWNLINK DOWN (Monitor Link)

GE1/0/3 DOWNLINK DOWN (Monitor Link)

The output shows that monitor link group 1 is down, and the downlink ports GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3 in monitor link group 1 are down.

# Display information about all monitor link groups on Device D.

[DeviceD] display monitor-link group all

Monitor link group 1 information:

Group status : UP

Downlink up-delay: 0(s)

Last-up-time : 17:09:33 2019/10/29

Last-down-time : -

Up-port-threshold: 1

Member Role Status

--------------------------------------------

GE1/0/2 UPLINK UP

GE1/0/1 DOWNLINK UP

GE1/0/3 DOWNLINK UP

The output shows that monitor link group 1 is up, and the downlink ports GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3 in monitor link group 1 are up.

# Display information about all smart link groups on Device A.

[DeviceA] display smart-link group all

Smart link group 1 information:

Device ID : 0000-fc00-2500

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 10

Protected VLAN : Reference Instance 1

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY DOWN 2 17:57:49 2019/10/29

GE1/0/2 SECONDARY ACTIVE 5 18:01:06 2019/10/29

The output shows that GigabitEthernet 1/0/1 on Device A is down. In smart link group 1, the secondary port GigabitEthernet 1/0/2 becomes active to transmit traffic from VLAN 10.

Configuration files

NOTE:

Support for the port link-mode bridge command depends on the device model.

· Device A:

vlan 1

vlan 10

stp region-configuration

instance 1 vlan 10

active region-configuration

smart-link group 1

preemption mode role

preemption delay 10

flush enable control-vlan 10

protected-vlan reference-instance 1

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10

undo stp enable

port smart-link group 1 primary

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10

undo stp enable

port smart-link group 1 secondary

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 10

· Device B:

vlan 1

vlan 11

stp region-configuration

instance 1 vlan 11

active region-configuration

smart-link group 1

preemption mode role

preemption delay 10

flush enable control-vlan 11

protected-vlan reference-instance 1

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 11

undo stp enable

port smart-link group 1 primary

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 11

undo stp enable

port smart-link group 1 secondary

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 11

· Device C:

vlan 1

vlan 10 to 11

monitor-link group 1

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10

undo stp enable

smart-link flush enable control-vlan 10

port monitor-link group 1 downlink

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

port monitor-link group 1 uplink

interface GigabitEthernet1/0/3

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 11

undo stp enable

smart-link flush enable control-vlan 11

port monitor-link group 1 downlink

· Device D:

vlan 1

vlan 10 to 11

monitor-link group 1

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 11

undo stp enable

smart-link flush enable control-vlan 11

port monitor-link group 1 downlink

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

port monitor-link group 1 uplink

interface GigabitEthernet1/0/3

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10

undo stp enable

smart-link flush enable control-vlan 10

port monitor-link group 1 downlink

· Device E:

vlan 1

vlan 10 to 11

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/3

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

Example: Configuring Smart Link in an IRF fabric

Network configuration

As shown in Figure 3, the Finance department in VLAN 10 and the Marketing department in VLAN 11 are connected to Device A and Device B, respectively. Device A and Device B form an IRF fabric and are connected to Device C and Device D.

Configure Smart Link to meet the following requirements:

· When the uplinks of Device A and Device B are available, traffic is forwarded through the link between Device A and Device C.

· When the link between Device A and Device C fails, the traffic switches to another link.

· When the link recovers, the traffic is switched back to the link.

Figure 3 Network diagram

Device	Interface	VLAN	Device	Interface	Device
Device A	GE1/0/1	10, 11	Device B	GE2/0/1	10, 11
Device A	GE1/0/3	10	Device B	GE2/0/3	11
Device C	GE1/0/1	10, 11	Device D	GE1/0/1	10, 11
Device C	GE1/0/2	10, 11	Device D	GE1/0/2	10, 11

Analysis

To implement dual uplink redundancy on Device A and Device B, configure a smart link group for the IRF fabric formed by Device A and Device B.

For the traffic to switch back to the recovered link, enable role preemption for the two smart link groups.

For the upstream device to refresh MAC address forwarding entries and ARP/ND entries when link switchover occurs in a smart link group, perform the following tasks:

· Enable flush message sending on Device A and Device B.

· Enable flush message receiving on GigabitEthernet 1/0/1 on Device C and Device D.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F switch	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C switch MS4520V2-54C switch	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S switch MS4520V2-24TP switch	Release 63xx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (excluding S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (excluding S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Not supported
S5000V3-EI switch series S5000V5-EI switch series	Not supported
S5000E-X switch series S5000X-EI switch series	Not supported
E128C switch E152C switch E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC switch IE4300-12P-PWR switch IE4300-M switch series IE4320 switch series	Release 63xx

Restrictions and guidelines

When you configure Smart Link in an IRF fabric, follow these restrictions and guidelines:

· Before you configure a port as a smart link group member, shut down the port to prevent loops. You can bring up the port only after completing the smart link group configuration.

· Before you configure a smart link member port or its directly connected port, disable the spanning tree feature and RRPP on the port.

· Make sure the receive control VLAN configured on the upstream device is the same as the transmit control VLAN configured on the smart link device.

· The control VLAN of a smart link group must also be one of its protected VLANs. Do not remove the control VLAN. Otherwise, flush messages cannot be sent correctly.

· For the restrictions and guidelines for configuring IRF, see HPE xxxx Virtual Technologies Configuration Guide.

Procedures

Setting up an IRF fabric

Configuring Device A

# Bind GigabitEthernet 1/0/2 to IRF port 1/2 and save the configuration.

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] shutdown

[DeviceA-GigabitEthernet1/0/2] quit

[DeviceA] irf-port 1/2

[DeviceA-irf-port1/2] port group interface gigabitethernet 1/0/2

[DeviceA-irf-port1/2] quit

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] undo shutdown

[DeviceA-GigabitEthernet1/0/2] quit

[DeviceA] save

# Activate the IRF port.

[DeviceA] irf-port-configuration active

Configuring Device B

# Assign IRF member ID 2 to Device B and reboot the device.

<DeviceB> system-view

[DeviceB] irf member 1 renumber 2

Warning: Renumbering the member ID may result in configuration change or loss. Continue? [Y/N]:y

[DeviceB] quit

<DeviceB> reboot

# After you connect the ports as shown in Figure 3, log in to the device again. Bind GigabitEthernet 2/0/2 to IRF port 2/1 and save the configuration.

<DeviceB> system-view

[DeviceB] interface gigabitethernet 2/0/2

[DeviceB-GigabitEthernet2/0/2] shutdown

[DeviceB-GigabitEthernet2/0/2] quit

[DeviceB] irf-port 2/1

[DeviceB-irf-port2/1] port group interface gigabitethernet 2/0/2

[DeviceB-irf-port2/1] quit

[DeviceB] interface gigabitethernet 2/0/2

[DeviceB-GigabitEthernet2/0/2] undo shutdown

[DeviceB-GigabitEthernet2/0/2] quit

[DeviceB] save

# Activate the IRF port.

[DeviceB] irf-port-configuration active

Device A and Device B start a master election. When the master (Device A in this example) is elected, the other device reboots. An IRF fabric is formed after the reboot.

Configuring Smart Link

Configuring Device A

1. Create VLAN 10 and VLAN 11.

<DeviceA> system-view

[DeviceA] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

# Shut down GigabitEthernet 1/0/1.

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] shutdown

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

[DeviceA-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceA-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceA-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceA-GigabitEthernet1/0/1] undo stp enable

[DeviceA-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 2/0/1 in the same way GigabitEthernet 1/0/1 is configured.

[DeviceA] interface gigabitethernet 2/0/1

[DeviceA-GigabitEthernet2/0/1] shutdown

[DeviceA-GigabitEthernet2/0/1] port link-type trunk

[DeviceA-GigabitEthernet2/0/1] port trunk permit vlan 10 11

[DeviceA-GigabitEthernet2/0/1] undo port trunk permit vlan 1

[DeviceA-GigabitEthernet2/0/1] undo stp enable

[DeviceA-GigabitEthernet2/0/1] quit

4. Configure GigabitEthernet 1/0/3:

# Configure GigabitEthernet 1/0/3 as an access port and assign the port to VLAN 10.

[DeviceA] interface gigabitethernet 1/0/3

[DeviceA-GigabitEthernet1/0/3] port access vlan 10

# Bring up the port.

[DeviceA-GigabitEthernet1/0/3] undo shutdown

[DeviceA-GigabitEthernet1/0/3] quit

5. Configure GigabitEthernet 2/0/3:

# Configure GigabitEthernet 2/0/3 as an access port and assign the port to VLAN 11.

[DeviceA] interface gigabitethernet 2/0/3

[DeviceA-GigabitEthernet2/0/3] port access vlan 11

# Bring up the port.

[DeviceA-GigabitEthernet2/0/3] undo shutdown

[DeviceA-GigabitEthernet2/0/3] quit

6. Configure VLAN-to-MSTI mappings and activate the MST region configuration::

# Enter MST region view.

[DeviceA] stp region-configuration

# Map VLAN 10 and VLAN 11 to MSTI 1.

[DeviceA-mst-region] instance 1 vlan 10 11

# Activate the MST region configuration

[DeviceA-mst-region] active region-configuration

[DeviceA-mst-region] quit

7. Configure smart link group 1:

# Create smart link group 1 and configure the VLANs mapped to MSTI 1, VLAN 10 and VLAN 11, as the protected VLANs.

[DeviceA] smart-link group 1

[DeviceA-smlk-group1] protected-vlan reference-instance 1

# Configure GigabitEthernet 1/0/1 as the primary port and GigabitEthernet 2/0/1 as the secondary port.

[DeviceA-smlk-group1] port gigabitethernet 1/0/1 primary

[DeviceA-smlk-group1] port gigabitethernet 2/0/1 secondary

# Enable flush message sending, and configure VLAN 10 as the transmit control VLAN.

[DeviceA-smlk-group1] flush enable control-vlan 10

# Enable role preemption and set the preemption delay to 10 seconds.

[DeviceA-smlk-group1] preemption mode role

[DeviceA-smlk-group1] preemption delay 10

[DeviceA-smlk-group1] quit

8. Bring up GigabitEthernet 1/0/1 and GigabitEthernet 2/0/1:

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] undo shutdown

[DeviceA-GigabitEthernet1/0/1] quit

[DeviceA] interface gigabitethernet 2/0/1

[DeviceA-GigabitEthernet2/0/1] undo shutdown

[DeviceA-GigabitEthernet2/0/1] quit

Configuring Device C

1. Create VLAN 10 and VLAN 11.

<DeviceC> system-view

[DeviceC] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceC] interface gigabitethernet 1/0/1

[DeviceC-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceC-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceC-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceC-GigabitEthernet1/0/1] undo stp enable

# Enable flush message receiving, and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceC-GigabitEthernet1/0/1] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceC-GigabitEthernet1/0/1] undo shutdown

[DeviceC-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2:

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

[DeviceC] interface gigabitethernet 1/0/2

[DeviceC-GigabitEthernet1/0/2] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceC-GigabitEthernet1/0/2] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceC-GigabitEthernet1/0/2] undo port trunk permit vlan 1

# Enable flush message receiving, and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceC-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceC-GigabitEthernet1/0/2] undo shutdown

[DeviceC-GigabitEthernet1/0/2] quit

Configuring Device D

1. Create VLAN 10 and VLAN 11.

<DeviceD> system-view

[DeviceD] vlan 10 to 11

2. Configure GigabitEthernet 1/0/1:

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

[DeviceD] interface gigabitethernet 1/0/1

[DeviceD-GigabitEthernet1/0/1] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceD-GigabitEthernet1/0/1] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceD-GigabitEthernet1/0/1] undo port trunk permit vlan 1

# Disable the spanning tree feature on the port.

[DeviceD-GigabitEthernet1/0/1] undo stp enable

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceD-GigabitEthernet1/0/1] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceD-GigabitEthernet1/0/1] undo shutdown

[DeviceD-GigabitEthernet1/0/1] quit

3. Configure GigabitEthernet 1/0/2:

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

[DeviceD] interface gigabitethernet 1/0/2

[DeviceD-GigabitEthernet1/0/2] port link-type trunk

# Assign the port to VLAN 10 and VLAN 11.

[DeviceD-GigabitEthernet1/0/2] port trunk permit vlan 10 11

# Remove the port from VLAN 1.

[DeviceD-GigabitEthernet1/0/2] undo port trunk permit vlan 1

# Enable flush message receiving and configure VLAN 10 and VLAN 11 as the receive control VLANs on the port.

[DeviceD-GigabitEthernet1/0/2] smart-link flush enable control-vlan 10 11

# Bring up the port.

[DeviceD-GigabitEthernet1/0/2] undo shutdown

[DeviceD-GigabitEthernet1/0/2] quit

Verifying the configuration

1. Verify the IRF fabric configuration after you complete the configuration:

# Display IRF fabric information on Device A.

<Sysname> display irf

MemberID Role Priority CPU-Mac Description

*+1 Master 1 0210-fc01-0001 -----

2 Standby 1 0210-fc02-0002 -----

--------------------------------------------------------

* indicates the device is the master.

+ indicates the device through which the user logs in.

The Bridge MAC of the IRF is: 00e0-fc00-1000

Auto upgrade : yes

Mac persistent : 6 min

Domain ID : 0

The output shows that an IRF fabric has been established successfully.

2. Verify the smart link group configuration when Device A is operating correctly:

# Display information about all smart link groups on Device A.

[DeviceA] display smart-link group all

Smart link group 1 information:

Device ID : 00e0-fc00-c518

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 10

Protected VLAN : Reference Instance 1

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY ACTIVE 3 18:16:44 2019/10/29

GE2/0/1 SECONDARY STANDBY 0 NA

The output shows that in smart link group 1, the primary port GigabitEthernet 1/0/1 is active to transmit traffic from VLAN 10 and VLAN 11.

3. Verify the smart link group configuration when GigabitEthernet 1/0/1 on Device A is down.

# Display information about all smart link groups on Device A.

[DeviceA] display smart-link group all

Smart link group 1 information:

Device ID : 00e0-fc00-c518

Preemption mode : Role

Preemption delay: 10(s)

Control VLAN : 10

Protected VLAN : Reference Instance 1

Member Role State Flush-count Last-flush-time

-----------------------------------------------------------------------------

GE1/0/1 PRIMARY DOWN 3 18:16:44 2019/10/29

GE2/0/1 SECONDARY ACTIVE 1 18:22:37 2019/10/29

The output shows that in smart link group 1, the secondary port GigabitEthernet 2/0/1 is active to transmit traffic for VLAN 10 and VLAN 11.

# Display information about the received flush messages on Device C.

[DeviceC] display smart-link flush

Received flush packets : 1

Receiving interface of the last flush packet : GigabitEthernet1/0/3

Receiving time of the last flush packet : 18:22:39 2019/10/29

Device ID of the last flush packet : 00e0-fc00-c518

Control VLAN of the last flush packet : 10

# Display information about the received flush messages on Device D.

[DeviceD] display smart-link flush

Received flush packets : 1

Receiving interface of the last flush packet : GigabitEthernet1/0/1

Receiving time of the last flush packet : 18:22:38 2019/10/29

Device ID of the last flush packet : 00e0-fc00-c518

Control VLAN of the last flush packet : 10

Configuration files

NOTE:

Support for the port link-mode bridge command depends on the device model.

· Device A:

sysname DeviceA

vlan 10 to 11

irf mac-address persistent always

irf auto-update enable

undo irf link-delay

irf member 1 priority 1

irf member 2 priority 1

irf-port 1/2

port group interface GigabitEthernet1/0/2

irf-port 2/1

port group 1 interface GigabitEthernet2/0/2

stp region-configuration

instance 1 vlan 10 to 11

active region-configuration

smart-link group 1

preemption mode role

preemption delay 10

flush enable control-vlan 10

protected-vlan reference-instance 1

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

port smart-link group 1 primary

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 10

interface GigabitEthernet2/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

port smart-link group 1 secondary

interface GigabitEthernet2/0/3

port link-mode bridge

port access vlan 11

· Device C:

sysname DeviceC

vlan 10 to 11

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

· Device D:

sysname DeviceD

vlan 10 to 11

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

undo stp enable

smart-link flush enable control-vlan 10 to 11

interface GigabitEthernet1/0/2

port link-mode bridge

port link-type trunk

undo port trunk permit vlan 1

port trunk permit vlan 10 to 11

smart-link flush enable control-vlan 10 to 11

H3C Fixed Port Campus Switches Configuration Examples-6W104

Configuring Device A

Configuring Device B

Configuring Device A

Configuring Device C

Configuring Device D

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