Example for Configuring Local MAC Swap Loopback

Networking Requirements

On SwitchB, GE0/0/1 connects to an Ethernet network and GE0/0/2 connects to users. A local MAC swap loopback test needs to be performed to test connectivity and performance of the Ethernet network. The local MAC swap loopback test checks performance of SwitchB.

Figure 1 Networking diagram of a local MAC swap loopback test

Configuration Roadmap

The configuration roadmap is as follows:

Create a VLAN and add GE0/0/1 and GE0/0/2 to the VLAN.
Configure local MAC swap loopback on SwitchB.
Enable the MAC swap loopback function on SwitchB to detect network connectivity and network quality.

Procedure

Create VLAN 100 on SwitchB, configure GE0/0/1 as a trunk interface and GE0/0/2 as a hybrid interface, and add the interfaces to VLAN 100.

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] vlan batch 100
[SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] port link-type trunk
[SwitchB-GigabitEthernet0/0/1] port trunk allow-pass vlan 100
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface gigabitethernet 0/0/2
[SwitchB-GigabitEthernet0/0/2] port link-type hybrid
[SwitchB-GigabitEthernet0/0/2] port hybrid pvid vlan 100
[SwitchB-GigabitEthernet0/0/2] port hybrid untagged vlan 100

Configure local MAC swap loopback on GE0/0/2 of SwitchB and specify GE0/0/1 as the outbound interface of loopback Ethernet frames. Enable the MAC swap loopback function.

[SwitchB-GigabitEthernet0/0/2] loopback local swap-mac source-mac 0018-2000-0085 dest-mac 018-2000-0070 vlan 100 interface gigabitethernet 0/0/1 timeout 80
[SwitchB-GigabitEthernet0/0/2] loopback swap-mac start
[SwitchB-GigabitEthernet0/0/2] quit

Verify the configuration.

# After completing the configuration, run the display loopback swap-mac information command to verify the configuration. If the configuration is correct, send IP packets from the tester to analyze network performance.

[SwitchB] display loopback swap-mac information
  Loopback type             : local                                             
  Loopback state            : running                                           
  Loopback test time(s)     : 80                                              
  Loopback interface        : GigabitEthernet0/0/2                             
  Loopback output interface : GigabitEthernet0/0/1                             
  Loopback source MAC       : 0018-2000-0085                                    
  Loopback destination MAC  : 0018-2000-0070                                    
  Loopback vlan             : 100                                                
  Loopback inner vlan       : 0                                                 
  Loopback packets          : 0                                                 
  Drop packets              : 0

Configuration Files

SwitchB configuration file

#
sysname SwitchB
#
vlan batch 100
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 100
#
interface GigabitEthernet0/0/2
 port link-type hybrid
 port hybrid pvid vlan 100
 port hybrid untagged vlan 100
 loopback local swap-mac source-mac 0018-2000-0085 dest-mac 0018-2000-0070 vlan 100 interface GigabitEthernet0/0/1 timeout 80
#
return