Brocade Virtual ADX Switch and Router Guide (Supporting AD Manual de usuario descargar pdf (Pagina 40)

26 Brocade Virtual ADX Switch and Router Guide

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Overview

FIGURE 2 Default Layer 2 port-based VLAN

When you configure a port-based VLAN, one of the configuration items you provide is the ports that

are in the VLAN. When you configure the VLAN, the Virtual ADX automatically removes the ports

that you place in the VLAN from DEFAULT-VLAN. By removing the ports from the default VLAN, the

Virtual ADX ensures that each port resides in only one Layer 2 broadcast domain.

NOTE

Information for the default VLAN is available only after you define another VLAN.

Some network configurations may require that a port be able to reside in two or more Layer 2

broadcast domains (port-based VLANs). In this case, you can enable a port to reside in multiple

port-based VLANs by tagging the port. See the following section.

If your network requires that you use VLAN ID 1 for a user-configured VLAN, you can reassign the

default VLAN to another valid VLAN ID. Refer to “Assigning a different VLAN ID to the default VLAN”

on page 34.

802.1q tagging

802.1q tagging is an IEEE standard that allows a networking device to add information to a Layer 2

packet in order to identify the VLAN membership of the packet. A Virtual ADX tags a packet by

adding a four-byte tag to the packet. The tag contains the tag value, which identifies the data as a

tag, and also contains the VLAN ID of the VLAN from which the packet is sent.

The tag contains the following:

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Brocade Virtual ADX Switch and Router Guide (Supporting AD Manual de usuario Pagina 40