Avaya VLANs BCM Rls 6.0 User Manual

BCM Rls 6.0

VLANs

Task Based Guide

VLANs

Notices

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VLANs

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VLANs

Table of Contents

VLANs ................................................................................ 5

Overview .................................................................................................. 5

Benefits of VLANs .............................................................................................. 6

BCM VLANs, DHCP, and the Published IP Address ......................................... 6

Allow Network Access ....................................................................................... 7

Auto-Discovery for IP Phones ............................................................................ 7

Supported VLANs .............................................................................................. 7

BCM LAN Ports and VLANs .............................................................................. 8

Example VLAN Network Scenario ..................................................................... 9

Required Information ................................................................................ 9

Flow Chart .............................................................................................. 10

Configuration .......................................................................................... 11

Configuring VLANs .......................................................................................... 11

Setting the Published IP Address .................................................................... 13

Configuring VLAN DHCP Address Ranges ..................................................... 16

Additional Information .................................................... 19

Configuring Static Routes ....................................................................... 19

Avaya Documentation Links .......................................... 21

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VLANs

VLAN ID: 1

HR Dept.

VLAN ID: 2 Support Dept.

VLAN switch

VLANs

Overview

Virtual LANs (VLANs) were designed to enable creation of multiple logical networks using common hardware. If a network administrator wanted to create separate logical networks but did not have a VLAN capable device, they would have to have a separate switch (or groups of switches) for each network they wanted to create, as below:

With a VLAN device such as a VLAN capable switch, separate logical networks can be created using common hardware. A simple example is shown below:

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VLANs

VLAN ID: 1

VLAN switch VLAN switch

VLAN ID: 2 VLAN ID: 3 VLAN ID: 1 VLAN ID: 2

VLAN ID: 7

Trunk Link

This example shows how two logical networks can be kept separate, and in effect, cannot “see” each other.

Another function of VLANs is to create logical networks across geographically dispersed sections within a company, as illustrated below.

The VLAN switches should be capable of VLAN tagging to be able to link VLANs across multiple VLAN switches.

Benefits of VLANs

VLANs have a number of advantages over traditional LANs:

 Increase in network Performance: In networks with a high

percentage of broadcasts and multicasts, VLAN reduces the possibility of sending the broadcast and multicast packets to unwanted destinations, i.e. broadcasts are kept within each VLAN.

 Virtual Group Formation: Virtual workgroups in a VLAN facilitates

increased communication between the members of the workgroup and restricts broadcasts and multicasts within a network.

 Simplified Administration: VLAN simplifies the task of the addition

and modification of users in the network.

 Security: Increased security due to computer’s/network devices on the

different VLAN’s not being able to “see” each other. Also, this feature

allows a separate VLAN for Management purposes.

BCM VLANs, DHCP, and the Published IP Address

On creating a VLAN on the BCM, corresponding DHCP ranges can also be configured to serve DHCP clients residing on the VLAN. For example, you may wish to create a VLAN specifically for IP Phones. After creating that VLAN, the DHCP configuration area will allow a range of addresses to be configured to issue to those IP Phones residing on that VLAN.

With the creation of VLANs, possibly for the purpose of segregating IP Phone and other network traffic, consideration should be given to the Published IP Address selection. The Published IP Address is the address that VoIP applications (IP Phones, VoIP trunks etc.) and LAN CTE should register

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Note: Allow Network Access acts as a routing facility. Network routers can also route traffic between the VLANs if they are accessible to the VLANs, and are configured to do so.

Note: VLAN routed traffic is processed by the BCM CPU. Consider your planning of VLAN routing so that VLAN routed traffic does not overload the BCM processor, particularly in the case of the BCM50 where the processing capability is not as great as the BCM450. You can check the processor usage via BCM Monitor to ensure that the BCM is not overloaded.

Note: This feature is supported on DHCP servers with the Avaya vendor specific IP sets

against (refer to the IP Telephony Guide for more information). The possible options will be:

 The Customer LAN address, or  Any of the BCM VLAN IP Addresses.

Allow Network Access

This feature allows traffic from one VLAN destined for other networks, or VLANs, to be forwarded. For example, if there is a VLAN created for IP Phones and those IP Phones need to communicate with IP Softphones on PCs residing on a separate VLAN, Allow Network Access can be enabled to facilitate this. Conversely, if the IP Softphones need to communicate with the regular IP Phones, Allow Network Access should be enabled on the VLAN that they reside on.

By default Allow Network Access (ANA) is disabled. This means that all traffic on one VLAN traversing via the BCM to other networks will be discarded.

Auto-Discovery for IP Phones

In a scenario where there are a number of VLANs configured in addition to the Customer LAN, each with a DHCP Address Range configured, the AutoDiscovery feature can be used on IP Phones to automatically query which VLAN it should be assigned to.

Firstly, the IP set requests an IP Address from the Customer LAN. Once obtained, this is immediately released and queries are made for an IP Address from each VLAN ID in turn, until an address is found on the appropriate VLAN for IP Phones.

Supported VLANs

The BCM50 supports 4 VLANs and the BCM450 supports 8 VLANs.

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