H3C S3100-52P Operation Manual

Also see for S3100-52P: Operation manual Operation manual Operation manual Operation manual Operation manual

Contents

Operation Manual – VLANH3C S3100-52P Ethernet Switch Chapter 1 VLAN Overview1-4II. MAC address learning mechanism of VLANsSwitches forward packets according to the destination MAC addresses of the packets.So that switches maintain a table called MAC address forwarding table to record thesource MAC addresses of the received packets and the corresponding ports receivingthe packets for consequent packet forwarding. The process of recording is called MACaddress learning.After VLANs are configured on a switch, the MAC address learning of the switch hasthe following two modes.z Shared VLAN Learning (SVL): the switch records all the MAC address entrieslearnt by ports in all VLANs to a shared MAC address forwarding table. Packetsreceived on any port of any VLAN are forwarded according to this table.z Independent VLAN Learning (IVL): the switch maintains an independent MACaddress forwarding table for each VLAN. The source MAC address of a packetreceived on a port of a VLAN is recorded to the MAC address forwarding table ofthis VLAN only, and packets received on a port of a VLAN are forwardedaccording to the VLAN’s own MAC address forwarding table.Currently, the H3C S3100-52P Ethernet switch adopts the IVL mode only. For moreinformation about the MAC address forwarding table, refer to the “MAC AddressForwarding Table Management” part of the manual.1.1.4 VLAN InterfaceHosts in different VLANs cannot communicate with each other directly unless routers orLayer 3 switches are used to do Layer 3 forwarding. The S3100-52P Ethernet switchsupports VLAN interfaces configuration to forward packets in Layer 3.VLAN interface is a virtual interface in Layer 3 mode, used to realize the layer 3communication between different VLANs, and does not exist on a switch as a physicalentity. Each VLAN has a VLAN interface, which can forward packets of the local VLANto the destination IP addresses at the network layer. Normally, since VLANs can isolatebroadcast domains, each VLAN corresponds to an IP network segment. And a VLANinterface serves as the gateway of the segment to forward packets in Layer 3 based onIP addresses.Note:An S3100-52P switch can be configured with a single VLAN interface only, and theVLAN must be the management VLAN. For details about the management VLAN, referto the “Stack-Cluster Configuration” part of this manual.