Types Of Vlans - Foundry Networks Switch and Router Installation And Configuration Manual

This chapter describes how to configure Virtual LANs (VLANs) on Foundry Layer 2 and Layer 3 Switches.
The "Overview" section provides basic information about Foundry's VLAN options. Following this section, other
sections provide configuration procedures and examples.
To display configuration information for VLANs, see "Displaying VLAN Information" on page 25-63.
For complete syntax information for the CLI commands shown in this chapter, see the Foundry Switch and Router
Command Line Interface Reference.
Most of the configuration examples in this chapter are based on CLI commands. For Web management
procedures, see "Configuring VLANs Using the Web Management Interface" on page 25-57.
Overview
This section describes the Foundry VLAN features. Configuration procedures and examples appear in later
sections of this chapter.

Types of VLANs

You can configure the following types of VLANs on Foundry devices.
• Layer 2 port-based VLAN – a set of physical ports that share a common, exclusive Layer 2 broadcast domain
• Layer 3 protocol VLANs – a subset of ports within a port-based VLAN that share a common, exclusive
broadcast domain for Layer 3 broadcasts of the specified protocol type
• IP sub-net VLANs – a subset of ports in a port-based VLAN that share a common, exclusive sub-net
broadcast domain for a specified IP sub-net
• IPX network VLANs – a subset of ports in a port-based VLAN that share a common, exclusive network
broadcast domain for a specified IPX network
• AppleTalk cable VLANs – a subset of ports in a port-based VLAN that share a common, exclusive network
broadcast domain for a specified AppleTalk cable range
When a Foundry device receives a packet on a port that is a member of a VLAN, the device forwards the packet
based on the following VLAN hierarchy:
• If the port belongs to an IP sub-net VLAN, IPX network VLAN, or AppleTalk cable VLAN, and the packet
belongs to the corresponding IP sub-net, IPX network, or AppleTalk cable range, the device forwards the
packet to all the ports within that VLAN.
December 2000
Configuring Virtual LANs (VLANs)
Chapter 25
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