WLAN 233X Access Points and Microsoft DHCP Technical Brief. Wireless LAN 2300 Engineering

Transcription

1 Wireless LAN 2300 Engineering WLAN 233X Access Points and Microsoft DHCP Technical Brief Avaya Data Solutions Document Date: Document Number: NN Document Version: 2.1

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3 Table of Contents Document Updates... 4 Conventions Introduction Prerequisites Configuration Example Verify Reference Documentation Customer service Getting technical documentation Getting product training Getting help from a distributor or reseller Getting technical support from the Avaya Web site

4 Document Updates 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. Caution 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: ERS T# show running-config Output examples from Avaya devices are displayed in a Lucida Console font: ERS T# show running-config! Embedded ASCII Configuration Generator Script! Model = Ethernet Routing Switch T-PWR! Software version = v enable configure terminal 4

5 1. Introduction This document provides an example configuration for a typical network environment where a Microsoft DHCP Server is used with the Avaya WLAN Security Switch 2300 and Avaya WLAN 233X Access Points to supply IP addresses or hostnames. 1.1 Prerequisites Before attempting to configure the Microsoft DHCP server or Avaya WLAN Security Switch 2300, please ensure that you meet the following prerequisites: Working knowledge of Microsoft Windows 2003 Server and DHCP Server. Working knowledge of the Wireless LAN Security Switch 2300 CLI or Wireless LAN 2300 Management Software Components Used The information in this technical brief is based on the following software and hardware versions: A Windows 2003 Server with the Microsoft DHCP Server installed. Two Avaya WLAN Security Switch 2300s (any model) with software release (or higher). One or more Avaya WLAN 233X Access Points. One Avaya Ethernet Routing Switch 5520 with software release (or higher). Avaya WLAN Management Software 2300 software release (or higher). Note: The configuration of the Avaya Ethernet Routing Switch 5520 is not the focus of this technical brief and will not be discussed in this document. The information presented in this technical brief was created from devices in a specific lab environment. If you are working in a live network environment ensure that you understand the impact of each command or configuration change before performing it. 5

6 1.1.2 Background Theory When the Avaya WLAN 233X Access Points are not directly connected to an Avaya WLAN Security Switch 2300, they require information from the network in order to function. At a minimum an Avaya WLAN 233X Access Point requires the following components in order to provide Wireless LAN services to clients: Configuration Profile A configuration profile needs to exist for the 233X Access Point on one or more Avaya WLAN Security Switch 2300s. Power 802.3af PoE must be provided on one of the Ethernet connections to the AP. DHCP A 233X Access Point uses TCP/IP for communication with the Avaya WLAN Security Switch and relies on DHCP to obtain IP addressing. DHCP services must be available on the VLAN in order for the 233X Access Point to boot and DHCP must provide the following parameters to the 233X Access Point: o o o o IP address Domain name DNS server address Default router address When an Avaya WLAN 233X Access Point is deployed in a typical enterprise environment the Access Point will often be connected to a VLAN which is not directly connected to an Avaya WLAN Security Switch In addition as Wireless LANs gain momentum in the enterprise customers demand high availability so that Wireless LAN services are always available to users if a WLAN Security Switch is unavailable. To address both of these requirements the Avaya Wireless LAN 2300 solution supports the ability to provide Avaya WLAN 233X Access Points with the IP addresses or hostnames of one or more WLAN Security Switch 2300s using standard based DHCP services. Leveraging the DHCP option 43 field, an Avaya 233X Access Point can be provided with one or more Avaya WLAN Security Switch IP addresses or hostnames that it will be used to locate its boot device. The Avaya 233X Access Points configuration profile can be defined on one or more Avaya WLAN Security Switches so that the Access Point can always boot if its primary Security Switch was to become unavailable. A 233X Access Point may also use DNS to locate an Avaya WLAN Security Switch 2300; however this is out of the scope of this document and is addressed in a separate Avaya Technical Brief. With release 5.0 Avaya WLAN 233X Access Points can be configured with static network addressing. For additional information and please reference the Avaya WLAN Security Switch 2300 Series Configuration Guide available on the Avaya public support web site. 6

7 1.1.3 Distributed APs and DHCP Option 43 The option 43 field in a DHCP Offer message can provide a simple and effective way for Avaya 233X Access Points to locate Avaya Wireless LAN Security Switches across an intermediate Layer 3 network as well as provide Avaya 233X Access Points with alternative Avaya Security Switches if the Primary Security Switch was to become unavailable. The DHCP option 43 field can be easily added to an existing scope on a Microsoft DHCP server to provide the 233X Access Points with the required boot information. The DHCP option 43 field supports the following formats: ip:wss-ipaddress1,wss-ipaddress2,... or host:wss-host1.domain.com,wss-host2.domain.com,... The DHCP option 43 field may supply IP addresses or hostnames, but not both. If the list contains both types of values, the DAP will not attempt to use the list. The IP and host keywords can be in lowercase, uppercase (IP or HOST), or mixed case (example: Ip, Host, and so on.) You may use spaces after the colon or commas, but spaces are not supported within IP addresses or hostnames. Leading zeroes are supported in IP addresses. For example, is valid. Valid characters in hostnames are uppercase and lowercase letters, numbers, periods (. ), and hyphens ( - ). Other characters are not supported. If you use the host option, you must configure the network s DNS server with address records that map the hostnames in the list to the WSS IP addresses. After receiving a DHCP Offer containing a valid string for option 43, a DAP sends a unicast Find message to each WSS switch in the list. 7

8 1.2 Configuration Example Network Diagram This technical brief uses the network configuration shown in the diagram below: Figure Network Diagram The above diagram shows an example network comprising of multiple VLANs and the following components: An Ethernet Routing Switch 5520 is configured with two VLANs (VLAN 1 & VLAN 2) with IP routing enabled. VLAN 1 is assigned the IP address and VLAN 2 is assigned the IP address DHCP forwarding is also enabled on VLAN 2 and is configured to forward DHCP requests to the Windows 2003 servers IP address The Windows 2003 Server is connected to the Ethernet Routing Switch on VLAN 1 and is assigned the IP address Two Wireless LAN Security Switch 2300s are connected to the Ethernet Routing Switch 5520 on VLAN 1. WSS is assigned the system IP addresses and WSS is assigned the IP address Both Security Switches are a member of a Mobility Domain and WSS is the seed switch. A 233X Access Point is connected to the Ethernet Routing Switch 5520 on VLAN 2. The Ethernet port is configured to provide 802.3af PoE and Spanning Tree Protocol is diabled. The default gateway for each device is the corresponding VLAN interface IP address on the Ethernet Routing Switch A DHCP scope is configured for VLAN 2 with options to provide hosts with a default gateway, DNS name server and DNS domain name. 8

9 1.2.2 Configurations Microsoft DHCP Server Configuring Microsoft DHCP Option 43 to supply WSS IP Addresses Start the DHCP administration tool by clicking Start, Programs, Administrative Tools and then DHCP. Expand the Scope that you wish to add the DHCP Option 43 to and then right click on Scope Options and select Configure Options. In the Available Options list select 043 Vendor Specific Info. In the ASCII field enter in the IP address of each WSS using the format ip: , Note: By default there is a 00 byte entry in option 43 field which shows as a period in the ASCII section. This must be deleted before typing in the string. Click OK. 9

10 Configuring Microsoft DHCP Option 43 to supply WSS Hostnames Start the DHCP administration tool by clicking Start, Programs, Administrative Tools and then DHCP. Expand the Scope that you wish to add the DHCP Option 43 to and then right click on Scope Options and select Configure Options. In the Available Options list select 043 Vendor Specific Info. In the ASCII field enter in the host and domain names of each WSS using the format host:wss domain.com,wss domain.com. Note: By default there is a 00 byte entry in option 43 field which shows as a period in the ASCII section. This must be deleted before typing in the string. Click OK. 10

11 WSS Configuration (WMS) Adding a DAP to WSS using WMS Start the Distributed AP Wizard by clicking Distributed AP in the Access Point Tasks list. Specify a Name, DAP Number and Serial Number. Optionally type in the Fingerprint if the AP Security Mode on the WSS is set to Required. Click Next. 11

12 Select the AP Model Number and AP Radio Type. Click Next. Select the b/g Radio Profile, Channel Number and Transmit Power. Click Next. Select the a Radio Profile, Channel Number and Transmit Power. Click Finish. Deploy Changes. 12

13 WSS Configuration (WMS) Configuring AP Redundancy on WSS using WMS Start the AP Redundancy Wizard by clicking AP Redundancy in the Access Point Tasks list. In the Select AP(s) list highlight the DAP that you wish to add a redundant WSS connection. Click Add Connection. 13

14 In the Select WSS(s) list specify a WSS name that you wish to define as the backup WSS to the AP. Specify the Low Bias setting which will define WSS as the least preferred switch. WSS will have a high bias setting and will be the primary switch. Click OK. Once the configuration is deployed the DAP will have a configuration profile on both the WSS and WSS switches. Any changes made in WMS will automatically be applied to both switches. Click OK. Deploy Changes. 14

15 WSS Configuration (CLI) Adding a DAP to WSS using CLI # Specifies the DAP number, serial-id and AP model number set dap 1 serial-id stp1w20kc3 model 2330 # Specifies the name of the DAP set dap 1 name # Specifies the bias of the DAP where WSS is the primary switch and wss is # the backup switch set dap 1 bias high # Specifies the b/g radio channel, power and radio profile set dap 1 radio 1 channel 1 tx-power 10 radio-profile default mode enable # Specifies the a radio channel, power and radio profile set dap 1 radio 2 channel 44 tx-power 10 radio-profile default mode enable # Save the changes save config WSS Configuration (CLI) Adding a DAP to WSS using CLI # Specifies the DAP number, serial-id and AP model number set dap 1 serial-id stp1w20kc3 model 2330 # Specifies the name of the DAP set dap 1 name # Specifies the bias of the DAP where WSS is the primary switch and wss is # the backup switch set dap 1 bias low # Specifies the b/g radio channel, power and radio profile set dap 1 radio 1 channel 1 tx-power 10 radio-profile default mode enable # Specifies the a radio channel, power and radio profile set dap 1 radio 2 channel 44 tx-power 10 radio-profile default mode enable 15

16 # Save the changes save config 1.3 Verify This section provides information you can use to confirm the configuration is working properly. Microsoft DHCP Server When an Avaya 233X Access Point obtains IP addressing from the Microsoft DHCP server, an entry will be created in Address Leases in the scope for the VLAN where the Access Point is connected. The entry will contain the Access Points assigned IP address as well as the Access Points MAC address. 16

17 Avaya WLAN Security Switch 2300 The following CLI commands can be used to verify the status and configuration of an Avaya 233X Access Point. The show dap status command is useful to verify the status of an Access Point on a Security Switch. WSS2300-1# show dap status 1 DAP: 1, IP-addr: (DHCP, vlan 'VLAN1'), AP model: 2330, manufacturer: Nortel, name: 2330_1 fingerprint: 6a:25:fc:6a:82:7d:e9:3a:3d:ea:03:64:43:54:fd:27 ==================================================== State: operational (encrypted and fingerprint not verified) CPU info: Atheros:MIPS32 speed= Hz version=ar5312, ram= s/n=stp1w20kc3 hw_rev=03 Uptime: 0 hours, 2 minutes, 4 seconds Radio 1 type: g, state: configure succeed [Enabled] operational channel: 1 operational power: 10 bssid1: 00:15:e8:dc:65:40, ssid: Nortel RFID Reports: Inactive Radio 2 type: a, state: configure succeed [Enabled] operational channel: 44 operational power: 10 bssid1: 00:15:e8:dc:65:41, ssid: Nortel RFID Reports: Inactive The show dap global command is useful to verify which WLAN Security Switches an Avaya Access Points configuration profile is configured on. WSS2300-1# show dap global DAP Serial Id Switch IP Address stp1w20kc HIGH - stp1w20kc LOW 17

18 1.3.1 Troubleshoot Avaya 233X Access Point The Health LED can be used to troubleshoot boot issue as it will provide you with the Access Points current state: A solid amber LED indicates that the Access Point is unable to boot or is waiting to receive boot information from a Security Switch. A continuous amber state could mean that the Access Points configuration is not defined on a Security Switch or the AP is unable to establish a connection to a Security Switch. The show dap unconfigured command can be used to identify any unconfigured Access Points that are connected to a Security Switch. An alternating green and amber LED indicates that the Access Point has established a connection to a Security Switch and is waiting for boot instructions and a configuration file. A solid green LED indicates that the Access Point is operational and has established a management connection as well as obtained a valid configuration file from a Security Switch. 18

19 2. Reference Documentation Document Title Avaya WLAN Security Switch 2300 Series Configuration Guide Avaya WLAN security Switch 2300 Series Command Line Reference Avaya WLAN Access Point 2330/2330A Installation Guide Publication Number B B B Description Avaya Wireless LAN Security Switch 2300 Configuration Guide. Avaya Wireless LAN Security Switch 2300 Command Line Reference Guide. Avaya WLAN 2330/2330A Access Points Installation Guide. 19

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