Vlan Interface; Management Vlan; Vlan Classification; Port-Based Vlan - H3C S5100-SI Operation Manual

Independent VLAN learning (IVL), where the switch maintains an independent MAC address
forwarding table for each VLAN. The source MAC address of a packet received in a VLAN on a port
is recorded to the MAC address forwarding table of this VLAN only, and packets received in a
VLAN are forwarded according to the MAC address forwarding table for the VLAN.
Currently, the H3C S5100-SI/EI series Ethernet switches adopt the IVL mode only. For more information
about the MAC address forwarding table, refer to the "MAC Address Forwarding Table Management"
part of the manual.

VLAN Interface

Hosts in different VLANs cannot communicate with each other directly unless routers or Layer 3
switches are used to do Layer 3 forwarding. The S5100-SI/EI series Ethernet switches support VLAN
interfaces configuration to forward packets in Layer 3.
VLAN interface is a virtual interface in Layer 3 mode, used to realize the layer 3 communication
between different VLANs, and does not exist on a switch as a physical entity. Each VLAN has a VLAN
interface, which can forward packets of the local VLAN to the destination IP addresses at the network
layer. Normally, since VLANs can isolate broadcast domains, each VLAN corresponds to an IP network
segment. And a VLAN interface serves as the gateway of the segment to forward packets in Layer 3
based on IP addresses.
An S5100-SI/EI series switch can be configured with a single VLAN interface only, and the VLAN must
be the management VLAN. For details about the management VLAN, refer to the "Management VLAN
Configuration" part of this manual.

VLAN Classification

Depending on how VLANs are established, VLANs fall into the following six categories.
Port-based VLANs
MAC address-based VLANs
Protocol-based VLANs
IP-subnet-based VLANs
Policy-based VLANs
Other types
At present, the S5100-SI/EI series switches support the port-based and protocol-based VLANs.

Port-Based VLAN

Port-based VLAN technology introduces the simplest way to classify VLANs. You can assign the ports
on the device to different VLANs. Thus packets received on a port will be transmitted through the
corresponding VLAN only, so as to isolate hosts to different broadcast domains and divide them into
different virtual workgroups.
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