47Please wait...Saving the converted configuration file to the main board succeeded.Slot 1:Saving the converted configuration file succeeded.Now rebooting, please wait...Device B and Device A form an IRF after Device B reboots.3. Configure the IRF fabric:# Enable the spanning tree feature globally on the IRF fabric. system-view[Sysname] stp enable# Configure the bridge MAC address of the IRF fabric to change as soon as the master leaves.[Sysname] undo irf mac-address persistent# Set the domain ID of the IRF fabric to 1.[Sysname] irf domain 14. Configure ARP MAD:# Create VLAN 3, and add GigabitEthernet 1/4/0/2 and GigabitEthernet 2/4/0/2 to VLAN 3.[Sysname] vlan 3[Sysname-vlan3] port gigabitethernet 1/4/0/2 gigabitethernet 2/4/0/2[Sysname-vlan3] quit# Create VLAN-interface 3, assign it an IP address, and enable ARP MAD on the interface.[Sysname] interface vlan-interface 3[Sysname-Vlan-interface3] mad arp enableYou need to assign a domain ID (range: 0-4294967295)[Current domain is: 1]:The assigned domain ID is: 1[Sysname-Vlan-interface3] ip address 192.168.2.1 245. Configure Device C as the intermediate device:CAUTION:If the intermediate device is in an IRF fabric, you must assign this fabric a different domain ID thanthe ARP MAD-enabled fabric.# Enable the spanning tree feature globally on Device C. system-view[DeviceC] stp enable# Create VLAN 3, and add GigabitEthernet 4/0/1 and GigabitEthernet 4/0/2 to VLAN 3.[DeviceC] vlan 3[DeviceC-vlan3] port gigabitethernet 4/0/1 gigabitethernet 4/0/2[DeviceC-vlan3] quitEnhanced IRF mode configuration exampleNetwork requirementsSet up a four-chassis IRF fabric at the access layer of the enterprise network in Figure 19. Configurea MAD mechanism in the IRF fabric, because the IRF fabric has a multichassis aggregate link toDevice E.