Vlan – Comtrol ES8510-XTE User Manual

Page 84

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84 - VLAN

RocketLinx ES8510-XTE User Guide: 2000574 Rev. C

Configuration Using the Web Interface

VLAN

A Virtual LAN (VLAN) is a logical grouping of nodes for the purpose of limiting a broadcast domain to specific
members of a group without physically grouping the members. The VLAN allows you to isolate network traffic
so that only members of the VLAN could receive traffic from the same VLAN members. Basically, creating a
VLAN from a switch is the logical equivalent of physically reconnecting a group of network devices to another
Layer 2 switch, without actually disconnecting these devices from their original switches.

The ES8510-XTE supports IEEE 802.1Q VLAN, which is also known as Tag-Based VLAN. This Tag-Based
VLAN allows a VLAN to be created across different switches. IEEE 802.1Q tag-based VLAN makes use of
VLAN control information stored in a VLAN header attached to IEEE 802.3 packet frames. This tag contains
a VLAN Identifier (VID) that indicates which VLAN a frame belongs to. Since each switch only has to check a
frame’s tag, without the need to dissect the contents of the frame, this saves a lot of computing resources
within the ES8510-XTE.

The following figure displays an IEEE 802.1Q VLAN.

The ES8510-XTE supports VLAN tunneling (QinQ), which expands the number of VLANs by adding a tag to
the 802.1Q packets. The original VLAN is usually identified as Customer VLAN (C-VLAN) and the new
VLAN is Service VLAN(S-VLAN). By adding the additional tag, QinQ increases the possible number of
VLANs. After QinQ is enabled, the ES8510-XTE can reach up to 256x256 VLANs. With different standard
tags, it also improves network security.

VLAN Configuration pages allow you to add and remove a VLAN, configure port Ingress/Egress parameters,
and view the VLAN table. The following pages are included in this group:

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VLAN Port Configuration

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