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Alteon OS Application Guide

Chapter 3: VLANs

 8142C4911, January 2007

Figure 3-1 Default VLAN settings

NOTE – The port numbers specified in these illustrations may not directly correspond to the

physical port configuration of your switch model.

When a VLAN is configured, ports are added as members of the VLAN, and the ports are

defined as either tagged or untagged (see Figure 3-2 through Figure 3-5).

In Figure 3-1, untagged incoming packets are assigned directly to VLAN 2 (PVID = 2). Port 5

is configured as a tagged member of VLAN 2, and port 7 is configured as an untagged member

of VLAN 2.

The default configuration settings for GbE Switch Modules have all ports set as untagged

members of VLAN 1 with all ports configured as PVID = 1. In the default configuration exam-

ple shown in Figure 3-1 on page 81, all incoming packets are assigned to VLAN 1 by the

default port VLAN identifier (PVID =1).

Figure 3-2 through Figure 3-5 illustrate generic examples of VLAN tagging.

Port 1

Data

CRC

Incoming

untagged

packet

BS45010A

Port 2 Port 3 Port 4 Port 5

VLAN 1

802.1Q Switch

By default:

Key

All ports are assigned PVID = 1

All external ports are untagged members of VLAN 1

All internal server ports are untagged members of VLAN 1

PVID = 1

Port 6 ...

Data

CRC

Outgoing

untagged packet

(unchanged)

Port 7

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 259 260

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Nortel Networks 42C4911 Manual de usuario Pagina 81