1-4z Independent VLAN learning (IVL), where the switch maintains an independent MAC addressforwarding table for each VLAN. The source MAC address of a packet received in a VLAN on a portis recorded to the MAC address forwarding table of this VLAN only, and packets received in aVLAN are forwarded according to the MAC address forwarding table for the VLAN.Currently, the Switch S4210 adopt the IVL mode only. For more information about the MAC addressforwarding table, refer to the “MAC Address Forwarding Table Management” part of the manual.VLAN InterfaceHosts in different VLANs cannot communicate with each other directly unless routers or Layer 3switches are used to do Layer 3 forwarding. The Switch S4210 support VLAN interfaces configurationto forward packets in Layer 3.VLAN interface is a virtual interface in Layer 3 mode, used to realize the layer 3 communicationbetween different VLANs, and does not exist on a switch as a physical entity. Each VLAN has a VLANinterface, which can forward packets of the local VLAN to the destination IP addresses at the networklayer. Normally, since VLANs can isolate broadcast domains, each VLAN corresponds to an IP networksegment. And a VLAN interface serves as the gateway of the segment to forward packets in Layer 3based on IP addresses.An Switch S4210 can be configured with a single VLAN interface only, and the VLAN must be themanagement VLAN. For details about the management VLAN, refer to the “Management VLANConfiguration” part of this manual.VLAN ClassificationDepending on how VLANs are established, VLANs fall into the following six categories.z Port-based VLANsz MAC address-based VLANsz Protocol-based VLANsz IP-subnet-based VLANsz Policy-based VLANsz Other typesPort-Based VLANPort-based VLAN technology introduces the simplest way to classify VLANs. You can assign the portson the device to different VLANs. Thus packets received on a port will be transmitted through thecorresponding VLAN only, so as to isolate hosts to different broadcast domains and divide them intodifferent virtual workgroups.Ports on Ethernet switches have the three link types: access, trunk, and hybrid. For the three types ofports, the process of being added into a VLAN and the way of forwarding packets are different.
