Avaya DHCP BCM User Manual

BCM Rls 6.0

DHCP

Task Based Guide

DHCP

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DHCP

Table of Contents

DHCP Server...................................................................... 5

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

DHCP and the BCM ......................................................................... 5

DHCP Modes ..................................................................................................... 5

Address Range .................................................................................................. 6

Reserved Addresses ......................................................................................... 6

IP Terminals Details ........................................................................................... 6

DHCP & VLANs ................................................................................................. 7

BCM50e Integrated Router ................................................................................ 7

Required Information ....................................................................... 8

Flow Chart ....................................................................................... 9

Configuration ................................................................................. 10

General Settings .............................................................................................. 10

Setting the Address Ranges ............................................................................ 12

Reserving Addresses ....................................................................................... 13

Viewing Current DHCP Clients ........................................................................ 16

Setting the IP Terminal Details ........................................................................ 17

Additional Information .................................................... 20

BCM Customer LAN IP Address .................................................... 20

Published IP Address..................................................................... 24

Avaya Documentation Links .......................................... 26

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DHCP Server

Overview

The BCM can provide DHCP (Dynamic Host Configuration Protocol) service to network clients. DHCP allows a network administrator to supervise and distribute IP addresses - and other network settings such as default gateways and DNS servers - from a central location. This service dynamically assigns IP addresses to network computers and/or IP telephones, so you do not need to manually assign an IP address. It can also automatically assign a new IP address if a device connects to a different place in the network.

The BCM can also issue Terminal Proxy Server (S1 & S2) settings to IP Telephones (e.g. i200x, 1100, 1200 series) which register using DHCP. This ensures that the IP phones register correctly with the BCM.

Note: BCM50 models: This guide describes the DHCP service on the standard BCM50. The settings detailed in this guide do not relate to DHCP on the BCM50e router. For information on the BCM50e DHCP settings, refer to the BCM50 Router LAN Settings Guide.

DHCP and the BCM

The BCM has various DHCP modes. It can issue DHCP information to:

 All devices on a network  IP Phones only  Or not be used as any type of DHCP server

As well as acting as a DHCP server, the BCM can be a DHCP client, i.e. it can request DHCP information from an established DHCP server on the network.

DHCP Modes

By default the BCM DHCP service is set to Enabled – IP Phones Only. Ensure that the mode is set correctly for the network.

The available modes are:

 Disabled – Does not respond to DHCP requests from any device.  Enabled – IP Phones only – Only responds to DHCP requests from IP

Phones.

 Enabled – All Devices – Responds to DHCP requests from PC’s and IP

Phones on the network.

Note: If DHCP is not required on the network, it is recommended that the DHCP mode is set to Disabled.

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Note: If there is an existing DHCP Server on the network, it is recommended that the BCM be given a static or reserved IP Address . See the network administrator to obtain a static IP Address. Refer to the BCM LAN IP Address section for information on setting the BCM IP Address.

Address Range

The Address Range is a specified range of addresses that the BCM will issue when requested by network DHCP clients. Careful planning is required here so as not to conflict with static or reserved addresses. Address Ranges should be manually configured on the BCM, i.e. there is no automatic configuration of Address Ranges.

Reserved Addresses

Addresses can be reserved for specific network devices. The purpose of this is to ensure that a particular network device always has the same IP address. The advantage of reserving an address over statically assigning an address on the network device itself is that the network device can still register with the DHCP server and obtain all the usual DHCP information such as default gateway, DNS Servers etc.

IP Addresses are reserved for a network device by entering the MAC address of the device and the IP Address reserved. A Reserved Address entry in the DHCP settings screen would require the following example information:

 MAC address, e.g. 00-04-23-0C-78-C8  Reserved IP Address, e.g. 30.30.30.5

Note: The MAC (physical) address can be viewed from the command prompt by entering ipconfig /all command

IP Terminals Details

The DHCP configurations screens contain information to be transferred to IP phones when they register via DHCP. The IP phone-specific information includes the S1 and S2 server address, which is the IP address that the phone has to register with to use IP Telephony features. The S1 and S2 address will most usually be the IP Address of the BCM LAN ports.

Other information that can be returned to DHCP requests from IP phones includes VLAN information.

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Note: For more information about the Published IP Address, refer to the IP Telephony Guide. For more information about VLANs, refer to the VLANs Guide.

DHCP & VLANs

A VLAN is a Virtual LAN whereby connected devices appear to be on the same physical network, although they may be geographically separated. This configuration is dependant on a network device being capable of supporting VLAN’s, and all VLAN information should be obtained from the network administrator who looks after the VLAN devices.

The BCM is capable of creating up to 4 VLANs on the BCM50, and 8 VLANs on the BCM450. This helps with network management, as it may not be desirable to have IP Phones and PCs on the same logical network.

Configuring VLANs on the BCM itself affects DHCP in two main areas:

 Published IP Address: Creating VLANs results in a choice of selection

for the Published IP Address (i.e. either the Customer LAN, or one of the VLANs). The Published IP Address should be the S1 Address in the IP Terminal DHCP Options screen.

 Address Ranges: If VLANs are configured on the BCM, DHCP Address

Ranges can be configured to suit the VLAN network range. For example, if a VLAN interface is configured with an address of

200.40.40.5, the BCM will allow an Address Range of 200.40.40.160 –

200.40.40.180 to be created.

BCM50e Integrated Router

On the BCM50e models, it is possible to choose between using the DHCP service on the main BCM unit, or the DHCP service on the router. There is an option with the DHCP General Settings tab on BCM50e models to select which DHCP Service to use. It is recommended that if VLANs are configured on the BCM, the main BCM unit DHCP service is used, and the router DHCP service is disabled.

For more information on the BCM50e router DHCP service, please refer to the Router – LAN Settings Guide.

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Required Information

Before commencing installation, certain information is required concerning the BCM and the customer’s network. For configurations as a DHCP Server:

 Has the LAN interface IP Address been set as required?  Does the customer already have a DHCP server?  What is the required range of IP addresses?  Is there a requirement for Reserved IP addresses?  Does the customer have a WINS server and if so, what is the IP

address?

 Is the customer using IP Phones?  Is the customer using VLAN’s?

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