Avaya BSGX4e User's Guide download pdf (Page 111)

VLAN C

ONFIGURATION

This chapter describes how to configure virtual LANs (VLANs) for the BSGX4e device.

NOTE: VLAN configuration is optional. Initially, no VLANs or virtual interfaces

(vifs) are configured.

A virtual LAN (VLAN) is a logically independent network, a logical subcomponent of a

physical network. Each VLAN functions as a separate network, and so its traffic is

isolated from traffic on other VLANs and traffic on the rest of the physical network.

This separation can offer protection from Internet multicasts and broadcasts.

The BSGX4e device supports IEEE 801.Q VLAN, which allows up to 64 VLANs on the

switch and up to 16 virtual interfaces (vif) in the IP stack. VLANs are integrated into

the host IP stack as separate layer 2 Ethernet interfaces.

Complete VLAN configuration requires the following steps:

1.Assignment of one or more switching ports to the VLAN.

A port can be assigned to more than one VLAN. After ports are assigned as

members of a VLAN, the LAN switch can forward Ethernet traffic between the

ports based on Ethernet addressing. The WAN port can also be assigned to a

VLAN.

2.Creation of a virtual interface for the VLAN.

If the VLAN is to communicate beyond the switch, it must have an IP address, and

for that, it must have a virtual interface (vif). Up to 16 virtual interfaces can be

defined in the IP stack; the virtual interfaces are referenced as vif0 through

vif15. A virtual interface can be defined on the LAN or WAN interfaces.

3.Assignment of an IP address range to the virtual interface.

4.Definition of one or more firewall security policies so that the firewall can

allow traffic through the virtual interface.

Assigning Ports to a VLAN

The first step in the configuration of a VLAN is to assign ports as members of the

VLAN. The same port can be assigned to more than one VLAN. The ports can be the

WAN port or any of the LAN switch ports. Switching is confined to the members of

VLANs.

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Avaya BSGX4e User's Guide Page 111