Example for Connecting a Single Device to an NLB Cluster (Using Physical Link Loopback)

Networking Requirements

In Figure 1, the Switch connects to three NLB servers respectively through GE0/0/1, GE0/0/2, and GE0/0/3.

Figure 1 Connecting a single device to an NLB cluster in unicast mode

The NLB cluster works in unicast mode, the cluster IP address is 10.128.246.252/24, and the cluster MAC address is 02bf-0a80-f6fc. There are reachable routes between the Switch and Client.

The customer requires that the Switch be able to send the Client's packets destined for the NLB cluster IP address to all NLB servers.

Configuration Roadmap

The configuration roadmap is as follows:

Add GE0/0/1 through GE0/0/3 that are directly connected to NLB servers to VLAN 100.
Disable STP, RSTP, VBST, or MSTP on GE0/0/4 and GE0/0/5, and add the interfaces to VLAN 100 and VLAN 200 respectively in access mode.
Configure an IP address for VLANIF 200 that functions as the NLB cluster's gateway.
Connect GE0/0/4 and GE0/0/5.

Procedure

Add GE0/0/1 through GE0/0/3 that are directly connected to NLB servers to VLAN 100.

<HUAWEI> system-view
[HUAWEI] sysname Switch
[Switch] vlan batch 100 200
[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] port link-type access
[Switch-GigabitEthernet0/0/1] quit
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] port link-type access
[Switch-GigabitEthernet0/0/2] quit
[Switch] interface gigabitethernet 0/0/3
[Switch-GigabitEthernet0/0/3] port link-type access
[Switch-GigabitEthernet0/0/3] quit
[Switch] vlan 100
[Switch-vlan100] port gigabitethernet 0/0/1 to 0/0/3
[Switch-vlan100] quit

Configure GE0/0/4 and GE0/0/5.

# Disable STP, RSTP, VBST, or MSTP on GE0/0/4 and GE0/0/5.

[Switch] interface gigabitethernet 0/0/4
[Switch-GigabitEthernet0/0/4] undo stp enable
[Switch-GigabitEthernet0/0/4] quit
[Switch] interface gigabitethernet 0/0/5
[Switch-GigabitEthernet0/0/5] undo stp enable
[Switch-GigabitEthernet0/0/5] quit

# Add GE0/0/4 and GE0/0/5 to VLAN 100 and VLAN 200 respectively in access mode.

[Switch] interface gigabitethernet 0/0/4
[Switch-GigabitEthernet0/0/4] port link-type access
[Switch-GigabitEthernet0/0/4] port default vlan 100
[Switch-GigabitEthernet0/0/4] quit
[Switch] interface gigabitethernet 0/0/5
[Switch-GigabitEthernet0/0/5] port link-type access
[Switch-GigabitEthernet0/0/5] port default vlan 200
[Switch-GigabitEthernet0/0/5] quit

Configure an IP address for the NLB cluster's gateway.

[Switch] interface vlanif 200
[Switch-Vlanif200] ip address 10.128.246.250 24
[Switch-Vlanif200] quit

Connect GE0/0/4 and GE0/0/5.
After the previous configurations, connect physical links.
Verify the configuration.
Verify that Server_1 through Server_3 can receive packets destined for the NLB cluster IP address.

Configuration Files

Switch configuration file

#
sysname Switch
#
vlan batch 100 200
#                                                                               
interface Vlanif200                                                             
 ip address 10.128.246.250 255.255.255.0                                        
#                                                                               
interface GigabitEthernet0/0/1              
 port link-type access                                                          
 port default vlan 100                                                
# 
interface GigabitEthernet0/0/2              
 port link-type access                                                          
 port default vlan 100                                                  
#                                                                               
interface GigabitEthernet0/0/3              
 port link-type access                                                          
 port default vlan 100                                                  
#                                                                               
interface GigabitEthernet0/0/4              
 port link-type access                                                          
 port default vlan 100                                                          
 stp disable                                                                    
# 
interface GigabitEthernet0/0/5              
 port link-type access                                                          
 port default vlan 200                                                          
 stp disable                                                                    
# 
return