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

Latest reply: Mar 23, 2017 07:57:43 2593 1 0 0



NLB is developed by Microsoft for a cluster set up by multiple Windows servers. When a switch is connected to an NLB cluster, the switch needs to send packets destined for the cluster IP address to every NLB server in the cluster. An NLB server can work in unicast, multicast, or IGMP multicast mode.

Currently, a switch can be connected to the NLB server working in only unicast or multicast mode. If the switch supports multi-interface ARP, this function is recommended to implement the connection between the switch and NLB cluster. When the switch or version does not support multi-interface ARP and there are insufficient device resources, you can use physical link loopback to connect the switch to the NLB cluster.

Configuration Notes

l   When the NLB cluster works in unicast mode, static ARP entries do not need to be configured on the switch; when the cluster works in multicast mode, static ARP entries need to be configured on the switch.

l   This example applies to all versions of all S series switches.

Networking Requirements

As shown in Figure 1-1, the Switch connects to three NLB servers through GE0/0/1, GE0/0/2, and GE0/0/3. The NLB cluster works in unicast mode, the cluster IP address is, 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.

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



Configuration Roadmap

The configuration roadmap is as follows:

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

2.         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.

3.         Configure an IP address for VLANIF 200 that functions as the NLB cluster's gateway.

4.         Connect GE0/0/4 and GE0/0/5.


                               Step 1     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

                               Step 2     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

                               Step 3     Configure an IP address for the NLB cluster's gateway.

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

                               Step 4     Connect GE0/0/4 and GE0/0/5.

After the previous configurations, connect physical links.

                               Step 5     Verify the configuration.

Verify that Server_1 through Server_3 can receive packets destined for the NLB cluster.


Configuration Files

Configuration file of the Switch

sysname Switch
vlan batch 100 200
interface Vlanif200                                                              
 ip address                                        
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                                                                    


The post is synchronized to: Configuration Examples (Switch)

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Created Mar 23, 2017 07:57:43 Helpful(0) Helpful(0)

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