1-4z Shared VLAN learning (SVL), where the switch records all learned MAC address entries in oneMAC address table, regardless of in which VLAN they are learned. This table is called the sharedMAC address forwarding table. Packets received in any VLAN on a port are forwarded according tothis table.z 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 H3C S3100 series Ethernet switches adopt the IVL mode only. For more informationabout the MAC address forwarding 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 S3100 series Ethernet switches support VLANinterfaces configuration to 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 S3100 series switch 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 typesAt present, the S3100 series switches support the port-based and protocol-based VLANs.
