2-4Do not enable both the selective QinQ function and the DHCP snooping function on a switch. Otherwise,the DHCP snooping function may operate improperly.Enabling the Inter-VLAN MAC Address Replicating FeatureFollow these steps to enable the inter-VLAN MAC address replicating feature:To do... Use the command... RemarksEnter system view system-view —Enable the inter-VLANMAC address replicatingfeaturemac-address-mapping index source-vlansource-vlan-id-list destination-vlandest-vlan-idRequiredBy default, the inter-VLANMAC address replicatingfeature is disabled.z On a port, the inter-VLAN MAC address replicating feature can be configured only once for adestination VLAN. If the configuration needs to be modified, you need to remove the existingconfiguration first.z With the inter-VLAN MAC address replicating feature disabled, all the MAC address entries that thedestination VLAN learns from the other VLANs through this function are removed.z MAC address entries obtained through the inter-VLAN MAC address replicating feature cannot beremoved manually. To remove a MAC address entry of this kind, you need to disable theinter-VLAN MAC address replicating feature first.Selective QinQ Configuration ExampleProcessing Private Network Packets by Their TypesNetwork requirementsz GigabitEthernet 1/0/3 of Switch A provides public network access for PC users and IP phone users.PC users belong to VLAN 100 through VLAN 108, and IP phone users belong to VLAN 200 throughVLAN 230. GigabitEthernet 1/0/5 of Switch A is connected to the public network. The peer end ofSwitch A is Switch B.z GigabitEthernet 1/0/11 of Switch B is connected to the public network. GigabitEthernet 1/0/12 andGigabitEthernet1/0/13 of Switch B provide network access for PC servers belonging to VLAN 100through VLAN 108 and voice gateways (for IP phone users) belonging to VLAN 200 through VLAN230 respectively.
