microsoft dhcp for wlan8100

Wireless LAN 8100

Engineering

> Microsoft DHCP for Wireless LAN 8100 Technical Configuration Guide

Avaya Data Solutions

Document Date: August 2012

Document Number: NN48500-612

Document Version: 1.2

Avaya Inc. – External Distribution 2

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© 2012 Avaya Inc. All Rights Reserved.

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Abstract The following guide provides a detailed overview of the standard and Avaya DHCP options and values that are supported by the Avaya 8100 series Access Points running firmware version 1.0.1 or higher.

Acronym Key

Throughout this guide the following acronyms will be used:

A-MDC – Active Mobility Domain Controller

B-MDC – Backup Mobility Domain Controller

DNS – Domain Name System

DHCP – Dynamic Host Configuration Protocol

IPv4 – Internet Protocol Version 4.

IPv6 – Internet Protocol Version 6.

Revision Control No Date Version Revised By Remarks

1 January 2011 1.0 K. Marshall Initial Release

2 February 2011 1.1 K. Marshall Updated Section 1.4.

3 August 2012 1.2 Updated Section 2.2.


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Table of Contents Figures .......................................................................................................................................................... 5

Tables ............................................................................................................................................................ 5

1. Supported DHCP Options ..................................................................................................................... 7

1.1 Vendor Class Identifier .................................................................................................................. 8

1.2 Standard DHCP Options ............................................................................................................... 8

1.3 Avaya DHCP Option 43 Sub Options ......................................................................................... 13

1.4 Avaya Legacy Options ................................................................................................................ 16

2. Configuration Example ........................................................................................................................ 17

2.1 Define Vendor Class ................................................................................................................... 17

2.2 Define Avaya Sub-Options .......................................................................................................... 19

2.3 Assign Avaya Sub-Options and Values to a Scope .................................................................... 22

3. Reference Documentation .................................................................................................................. 26


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Figures Figure 1.0 – DHCP Process .......................................................................................................................... 7

Tables Table 1.1 – Vendor Class Identifier ............................................................................................................... 8 Table 1.2 – Standard DHCP Options ............................................................................................................ 9 Table 1.3 – Avaya DHCP Options .............................................................................................................. 13


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Conventions This section describes the text, image, and command conventions used in this document.

Symbols

Tip – Highlights a configuration or technical tip.

Note – Highlights important information to the reader.

Warning – Highlights important information about an action that may result in equipment damage, configuration or data loss.

Text

Bold text indicates emphasis.

Italic text in a Courier New font indicates text the user must enter or select in a menu item, button or command:

ERS5520-48T# show running-config

Output examples from Avaya devices are displayed in a Lucida Console font:

ERS5520-48T# show sys-info

Operation Mode: Switch

MAC Address: 00-12-83-93-B0-00

PoE Module FW: 6370.4

Reset Count: 83

Last Reset Type: Management Factory Reset

Power Status: Primary Power

Autotopology: Enabled

Pluggable Port 45: None




Base Unit Selection: Non-base unit using rear-panel switch

sysDescr: Ethernet Routing Switch 5520-48T-PWR

HW:02 FW:6.0.0.10 SW:v6.2.0.009

Mfg Date:12042004 HW Dev:H/W rev.02


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1. Supported DHCP Options The Avaya 8100 series Access Points requires DHCP to obtain network addressing and discover the Avaya 8100 series Wireless Controllers. Avaya 8100 Series Access Points and support various standard and vendor specific DHCP options to which are implemented provide the Access Points with the necessary information required to communicate on the IP network, discover Wireless Controllers and optionally enable syslog logging and site survey modes.

Figure 1.0 – DHCP Process

Standard and vendor specific DHCP options are provided to Avaya 8100 series Access Points with the DHCP Offer and DHCP ACK forwarded from the DHCP server:

1) The Avaya 8100 series Access Points broadcasts a DHCP Discover message onto the physical network to discover available DHCP servers. The DHCP server can be located on the same IP subnet as the Access Point or through a Layer 3 enabled device that support DHCP Relay which can forward DHCP packets to a DHCP server on a different VLAN. The DHCP discover message will include DHCP option 55 (Parameter Request List) which tells the DHCP server what DHCP options the Avaya 8100 series Access Points may receive from the DHCP scope.

2) When a DHCP server receives a DHCP Discover message from an Access Point, it reserves an IP address and forwards a lease by sending a DHCP Offer message to the Access Point. The DHCP Offer will include the IP address to be assigned to the Access Point as well as any standard, vendor specific and/or user defined DHCP options that are supported by the device and are assigned to the DHCP scope.

3) An Avaya 8100 series Access Point may receive DHCP Offers from multiple DHCP servers but will only accept one DHCP Offer. The Access Point will forward a broadcast DHCP Request message with a transaction ID to inform the available DHCP servers which lease the Access Point has accepted. The DHCP servers whose lease the Access Point did not accept will return the offered address to their pool of available addresses.

4) When the DHCP server receives the DHCP Request message from the Access Point, the DHCP process enters its final phase. The DHCP server serving the lease will forward a DHCP ACK message to the Access Point that include the lease duration and any standard and vendor specific DHCP options the Access Point might have requested. At this point, the DHCP IP configuration process is complete.

Each DHCP server must include a DHCP scope for each IPv4 or IPv6 subnet that it serves. Each DHCP scope must include a pool of IP addresses that can be leased to DHCP clients as well as standard and vendor specific DHCP options that are to be assigned to the DHCP clients leasing IP addresses from the scope.


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1.1 Vendor Class Identifier In some instances it may be desirable to supply unique DHCP options to a subset of devices in a VLAN such as printers or Avaya 8100 Access Points without creating static DHCP reservations or assigning device specific options directly to the entire scope. This is the purpose behind vendor class DHCP options.

Avaya 8100 series Access Points support DHCP option 60 (Vendor Class Identifier) which is forwarded to the DHCP server with the DHCP Discover and ACK that identifies the Access Point as an ‘Avaya’ Access Point. The DHCP server will filter the on supplied vendor class string and return specific DHCP options and values to the Access Points.

Using the vendor class identifier allows DHCP administrators to assign vendor specific DHCP options to devices without running the risk of duplicating options within the DHCP scope. For example it allows an organisation to supply separate DHCP option 43 values to different vendor devices which would not be possible if the option 43 value was assigned directly to the scope.

The Avaya 8100 series Access Points with 1.0.1 firmware or higher support the following vendor class identifier string:

Device Vendor Class String

AP 8120 Avaya AP 8100

Table 1.1 – Vendor Class Identifier

1.2 Standard DHCP Options The Avaya 8100 series Access Points supports and implements the following standard DHCP options:

Option Description

001 Subnet Mask

003 Router

006 Name Server

012 Hostname

015 Domain Name

028 Broadcast Address

043 Vendor Specific Information

050 Requested IP Address

051 IP Address Lease Time

053 DHCP Message Type

054 Server Identifier


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055 Parameter Request List

058 Renewal Time Value

059 Rebinding Time Value

060 Class Identifier

061 Client Identifier

Table 1.2 – Standard DHCP Options

1.2.1 DHCP Option 001 (Subnet Mask)

The subnet mask option specifies the DHCP client’s subnet mask. If both the subnet mask and the router option are specified in a DHCP reply, the subnet mask option MUST be supplied first.

Option Description Format Example

001 Subnet Mask IP Address 255.255.255.0

1.2.2 DHCP Option 003 (Router)

The router option specifies a list of IP addresses for routers (default gateway) on the DHCP client’s subnet. Routers should be listed in order of preference.

This option must be supplied to Avaya 8100 series Access Points if the Avaya 8100 series Wireless Controllers are deployed on a separate IP subnet.


003 Router IP Address 192.168.1.1

1.2.3 DHCP Option 006 (Name Server)

The domain name server option specifies a list of Domain Name System name servers available to the DHCP clients. DNS servers should be listed in order of preference.

This option must be supplied to Avaya 8100 series Access Points if DNS name resolution is being used to discover the Avaya 8100 series Wireless Controllers.


006 Name Server IP Address 192.168.1.2


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1.2.4 DHCP Option 015 (Domain Name)

The domain name option specifies the domain name that DHCP clients should use when resolving hostnames via the domain name system.

This option must be supplied to Avaya 8100 series Access Points if DNS name resolution is being used to discover the Avaya 8100 series Wireless Controllers.


015 Domain Name String example.com

1.2.5 DHCP Option 028 (Broadcast Address)

The broadcast address option specifies the broadcast address in use on the DHCP clients subnet.


028 Broadcast Address IP Address 192.168.1.255

1.2.6 DHCP Option 042 (Network Time Protocol Server)

The network time protocol server option provides the DHCP clients with a list of one of more Network Time Protocol server IP addresses.


042 Network Time Protocol Server

IP Address 192.168.1.6

1.2.7 DHCP Option 050 (Requested IP Address)

The requested IP address option is used in a client request (DHCP Discover) to allow the DHCP clients to request a particular IP address be assigned.


050 Requested IP Address IP Address 192.168.1.10

1.2.8 DHCP Option 051 (IP Address Lease Time)

The IP address lease time option is supplied to the DHCP clients with the DHCP Offer to indicate the lease time the DHCP server willing to offer.


051 IP Address Lease Time Integer 86400


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1.2.9 DHCP Option 053 (DHCP Message Type)

The DHCP message type option is used to convey the type of the DHCP message.


053 DHCP Message Type Integer 1 – DHCP Discover

2 – DHCP Offer

3 – DHCP Request

4 – DHCP Decline

5 – DHCP ACK

6 – DHCP NAK

7 – DHCP Release

1.2.10 DHCP Option 054 (Server Identifier)

The server identifier is used in DHCP Offer messages in order to allow the DHCP clients to distinguish between multiple DHCP lease offers. A DHCP client will indicate which of several lease offers is being accepted by including this option in a DHCP Request message.


054 Server Identifier IP Address 192.168.10.6

1.2.11 DHCP Option 055 (Parameter Request List)

This parameter request list option is used by the DHCP clients to request values for specified configuration parameters.


055 Parameter Request List Integer 1 – Subnet Mask

3 – Router

6 – Domain Name Server

12 – Hostname

15 – Domain Name

28 – Broadcast Address

40 – Network Information Service Domain

41 – Network Information Service Servers

42 – Network time protocol Servers

43 – Vendor-Specific Information

60 – Vendor Class Identifier


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1.2.12 DHCP Option 058 (Renewal Time Value)

The renewal time value option specifies the time interval from address assignment until the DHCP client transitions to a renewing state.


058 Renewal Time Vale Integer 86400 (seconds)

1.2.13 Option 059 (Rebinding Time Value)

The rebinding time value option specifies the time interval from address assignment until the DHCP client transitions to a renewing state.


059 Rebinding Time Value Integer 86400 (seconds)

1.2.14 DHCP Option 060 (Class Identifier)

The class identifier option is used by DHCP clients to optionally identify the type and configuration of a DHCP client. Hardware vendors or administrators may choose to define specific class identifiers to convey particular configuration or other identification information about a client such as vendor name, model and firmware version.


060 Class Identifier String Avaya AP 8100

1.2.15 DHCP Option 061 (Client Identifier)

The client identifier option is used by DHCP clients to optionally specify their unique identifier which contains the hardware type and hardware address.


061 Client Identifier String 015ce286104ac0


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1.3 Avaya DHCP Option 43 Sub Options The following section outlines the DHCP option 43 sub options supported by Avaya AP 8100 Access Points running 1.0.1 or later firmware:

Option Type Firmware Description

1 IP Address (Array)

1.0.1 (or higher) Wireless Controller IPv4 address

2 String 1.0.1 (or higher) Wireless Controller IPv6 address or DNS name for wireless controller

3 Integer 1.0.1 (or higher) Wireless controller base UDP/TCP port for communication

4 Integer 1.0.1 (or higher) Enable AP in site survey mode

5 IP Address 1.0.1 (or higher) TFTP server IPv4 address for downloading AP site survey image

6 String 1.0.1 (or higher) AP site survey image version

7 String 1.0.1 (or higher) AP site survey image name

8 String 1.0.1 (or higher) Avaya AP sub-option start string “AVAYA AP”

Table 1.3 – Avaya DHCP Options

1.3.1 Avaya Sub Option 008 (Start String)

This sub-option is mandatory and must be included with DHCP option 43 values supplied to the Avaya 8100 series Access Points. Avaya 8100 series Access Points will only decode additional sub-options if this option and value AVAYA AP is present in the DHCP offer. If this sub-option is absent, the Access Points will drop all additional sub-options without decoding.

Option Description Format Example (Mandatory)

008 Start String String AVAYA AP


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1.3.2 Avaya Sub Option 001 (Controller IP Address)

This sub-option can be included with the DHCP option 43 to provide Avaya 8100 series Access Points with one or more Avaya 8100 series Wireless Controller IP addresses. The IP Address supplied should point to the IP addresses of the Active Mobility Domain Controller (A-MDC) and Backup Mobility Domain Controller (B-MDC).

The Avaya 8100 series Access Points maybe managed by a non A-MDC or non B-MDC based on the Access Points preferred controller configuration or load-balancing performed by the A-MDC / B-MDC.

If sub-option 001 and sub-option 002 are absent, the Avaya 8100 series Access Points will attempt discovery by resolving the default hostnames WC1, WC2, WC3 and WC4.


001 Controller IP Address IP Address (Array)

192.168.1.30

192.168.1.31

1.3.3 Avaya Sub Option 002 (Controller Hostname)

This sub-option can be included with DHCP option 43 to provide the Avaya 8100 series Access Points with a user defined hostname used to discover Avaya 8100 series Wireless Controllers. The hostname supplied should resolve to the IP addresses of the Active Mobility Domain Controller (A-MDC) and/or Backup Mobility Domain Controller (B-MDC).

The Avaya 8100 series Access Points maybe managed by a non A-MDC or B-MDC based on the Access Points preferred controller configuration or load-balancing performed by the A-MDC / B-MDC.

If this sub-option is provided, the DHCP server MUST include option 06 Domain Name Server in DHCP offer.


002 Controller Hostname String wc8180-1

wc8180-2

1.3.4 Avaya Sub Option 003 (Controller Base Port)

This sub-option can be included with DHCP option 43 to provide the Avaya 8100 series Access Points with the TCP/UDP base port configured on the Avaya 8100 series Wireless Controllers when the default base port 61000 has been modified.

The base port can be obtained by issuing a show wireless command on the 8100 series wireless controllers.


003 Controller Base Port Integer 62000


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1.3.5 Avaya Sub Option 004 (Site Survey Mode)

This sub-option can be included with DHCP option 43 to enable site survey mode on the Avaya 8100 series Access Points. This option is used to tell the Avaya 8100 series Access Points to download and boot from a site-survey image. The site survey image converts the Avaya 8100 series Access Points to stand-alone mode with a minimal feature set for performing site surveys.


004 Site Survey Mode Integer 1

1.3.6 Avaya Sub Option 005 (TFTP Server Address)

This sub-option can be included with DHCP option 43 to communicate the TFTP server IP address the Avaya 8100 series Access Points are to use to download the site survey image from. This sub-option is only decoded if sub-option 007 (Site Survey Image Name) is available.


005 TFTP Server IP Address IP Address 192.168.1.7

1.3.7 Avaya Sub Option 006 (Site Survey Image Version)

This sub-option can be included with DHCP option 43 to verify the site survey image version available on the Avaya 8100 series Access Points and the TFTP server. If there is a version mismatch, the Avaya 8100 series Access Points will download the new site survey image from the TFTP server.


006 Site Survey Image Version String 1.0.0.05

1.3.8 Avaya Sub Option 007 (Site Survey Image Name)

This sub-option can be included with DHCP option 43 to communicate the site survey image filename the Avaya 8100 series Access Points are to download.


007 Site Survey Image Name String AP8120Aux_1_0_0_05.tar


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1.4 Avaya Legacy Options Prior to release 1.0.1 the Avaya 8100 series Access Points required a single DHCP option 43 vendor-encapsulated option string to provide the Access Points with the IP addresses off the Avaya 8100 series Wireless Controllers and if necessary the base port.

This vendor-encapsulated option had to forward to the Avaya 8100 series Access Points with the DHCP Offer and DHCP ACK as a hex string that used the following format:

<Mandatory Prefix><IP Address 1><IP Address 2><IP Address 3><Optional Base Port>

Mandatory Prefix 08:08:41:56:41:59:41:20:41:50 = AVAYA AP

IP Address 01:04:co:a8:0b:1e = 192.168.11.30

01:04:c0:a8:0b:1f = 192.168.11.31

Note: Each IP Addresses must include the prefix 01:04.

Optional Base Port 03:03:[ee:48] = 61000

Note: The base port must include the prefix 03:03.

An example entry to provide Avaya 8100 series Access Points with the Wireless Controller IP Addresses 192.168.11.30 & 192.168.11.31 with the base port 6200 would be as follows:

08:08:41:56:41:59:41:20:41:50:01:04:co:a8:0b:1e:01:04:c0:a8:0b:1f:03:03:f2:30

Access Points running 1.0 GA firmware do not support the new DHCP options. To migrate to the new DHCP options, all the Access Points serviced by the DHCP scope must be running 1.0.1 or later firmware. To ease migration it is recommended that the legacy options be maintained in the DHCP scope until all the Access Points serviced by the DHCP scope have been upgraded. Once the Access Points have been upgraded, the new DHCP options can be added to the scope.

Prior to the 1.0 GA release, Avaya 8100 series Access Points only supported IP addresses using a 01:04 prefix followed by the controller IP address in Hex (example 01:04:co:a8:0b:1e). Access Points running pre-GA firmware will only perform discovery if this option 43 format is used.


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2. Configuration Example The following configuration example demonstrates how to provision a Microsoft Windows DHCP Server to support vendor class and sub-options for the Avaya 8100 series Access Points then apply the vendor class and sub-option values to a scope:

2.1 Define Vendor Class

1 Open the DHCP Snap-In. Right-click on the applicable DHCP server branch then click Define Vendor Classes:

2 Click Add:


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3 In the Display name field enter Avaya AP 8100. In the ASCII field type Avaya AP 8100. Optionally enter a Description then click OK:


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2.2 Define Avaya Sub-Options

1 Right-click on the applicable DHCP server branch then click Set Predefined Options:

2 In the Predefined Options and Values window, select the Option Class name Avaya AP 8100 then click Add:


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3 Define the following mandatory Avaya sub-option to configure the Avaya 8100 series Access Points to support additional sub-options:

4 Define the following recommended sub-options to enable Avaya 8100 series Wireless Controller discovery:


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5 Optionally define the following sub-options to enable site survey operations:


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2.3 Assign Avaya Sub-Options and Values to a Scope

1 Select a scope supporting the Avaya 8100 series Access Points, right-click then select Configure Options:

2 Check the mandatory option 008 Start String. In the String value field enter the value AVAYA AP. Click OK:

Avaya sub-option 008 – Start String

SubOption (001) needs to be applied before SubOption (008).


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3 The following provides scope option examples for enabling Avaya 8100 series Wireless Controller discovery:

Avaya sub-option 001 – Controller IP Address

Avaya sub-option 002 – Controller Hostname

Avaya sub-option 003 – Controller Base Port


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4 The following provides scope option examples to enable site survey operation:

Avaya sub-option 004 – Site Survey Mode

Avaya sub-option 005 – TFTP Server IP Address

Avaya sub-option 006 – Site Survey Image Version

Avaya sub-option 007 – Site Survey Image Name


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5 Configured scope options and values will be displayed in the DHCP scope and will only be assigned to Avaya 8100 series Access Points being served from the scope:


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3. Reference Documentation

Document Title Description

http://support.microsoft.com Microsoft Windows Server 2008 DHCP Server

© 2012 Avaya Inc. All Rights Reserved.

Avaya and the Avaya Logo are trademarks of Avaya Inc. and are registered in the United States and other countries. All trademarks identified by ®, TM or SM are registered marks, trademarks, and service marks, respectively, of Avaya Inc. All other trademarks are the property of their respective owners. Avaya may also have trademark rights in other terms used herein. References to Avaya include the Nortel Enterprise business, which was acquired as of December 18, 2009.

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