Allied Telesis AT-WR4600 User's Manual
Contents
1. esee ertet enne tenente tenente tenenete tenete nete 7 Parameter descriptons o oh dox t REESE RTEIR RAE REESUIESEE CERES digs EI TE ET EHE RESTE 7 Connecting AT WR4600 products eese ee eenene tenens tete tenetete ten enete tenet ete ten snete tete ten eese tet 8 Configuration examiple eed o delest ee etae er iere repa eren eR HERR net dvd CER ee EU add 10 Using QoS to prioritize voice traffic 0 ieee eee nneeee sinri uniia rir EREE 10 oio Lm 11 BridgeO station role root bridge sseseeenm e 12 Bridge 1 station role non root bridge AP1 station role root access point 13 Bridge2 station role non root bridge sseemH 14 Page 3 How To Configure the WLAN with QoS alliedtelesis com Overview What is Wi Fi Multimedia WMM The Wi Fi Alliance defined WMM as a subset of the IEEE 802 11e standard to support QoS on wireless networks WMM offers a mechanism to prioritize traffic demands from different applications and grants an adequate support to multimedia applications thereby reducing the harmful effects caused by high latency and throughput reductions Why use Wi Fi Multimedia Multimedia and data centric applications typically share the same network resources despite their conflicting requirements for data delivery Without QoS the network offers a best effort service which means that applications have equal opportunities to transfer data WMM enables network ma2. DCF interframe space AISF arbitration interframe space used by QoS facility EIFS extended interframe space used to extend the DIFS in case no ACK is received in time Note the node delivering data waits for DIFS before sending next frame and within that interval the receiver replies the ACKnowledgement frame to confirm the reception succeeded It may happen the receiver delays the replay due to the signal propagation on long distance link or additional time is required by receiver for decoding and error recovery in that case EIFS is included giving the opportunity to return the ACK Figure WMM access timing WMM requires that the clients running multimedia applications assign the appropriate priority level to the generated data traffic and that network infrastructure consistently applies QoS policies WMM derives four Access Categories from IEEE 802 1D Class of Service CoS as depicted by Table 2 Within the wireless node the WMM manages four independent transmit queues one per access category and dispatches to them incoming packets depending on the assigned Layer 3 differentiated service field TOS DSCP Packet forwarding will happen basing on transmit opportunities Table 2 WMM Access Categories and IEEE 802 1d tag mapping IEEE 802 1D Traffic Types Access Category Highest 1 SDTV and HDTV streaming Priority Description Best effort Lower 1 Traffic less sensitive of latency but 0 3 Haud affected
3. Access HCCA EDCA gives precedence to higher priority traffic by means of a shorter arbitration interframe space AIFS and contention windows CW The back off time is the sum of predefined AIFS and a random value from 0 to CW which is doubled at each collision till the limit CW max is reached Figure 1depicts the timing In addition transmit opportunity TXOP bounds the time allocated to the node for data delivery HCCAis a centralized access control facility coordinated by the access point which acts as point coordinator PC The PC collects the status of registered stations via polling and provides them the permission for channel occupancy and assigns for example the TXOP the transmit start time and duration 1 Carrier Sense Multiple Access with Collision Avoidance 2 HCCA facility is not delivered by current software release Page 5 How To Configure the WLAN with QoS alliedtelesis com minimum wait AIFS random backoff CW AIFS DIFS 7 slots CW 0 15 slots background AIFS DIFS 3 slots CW 0 15 slots best effort AIFS DIFS 2 slots transmission opportunity AIFS DIFS 2 slots slot time EIFS optional DIFS contention window PIFS SIFS Toe a Te mt busy medium backoff slots Interframe spaces SIFS short interframe space PIFS PCF interframe space used by HCCA facility DIFS
4. LN m Parle Bridgeo i b 10 0 0 0 24 h Bridge2 Figure 2 QoS giving preference to voice traffic Page 10 How To Configure the WLAN with QoS alliedtelesis com Common setup To restore the factory configuration on any device enter the following commands T WR4600 copy nvram factory config bridged startup config T WR4600 reload Configure the common SSID for open authentication T WR4600 config dot11 ssid ATIopen T WR4600 config ssid authentication open T WR4600 config ssid quest mode T WR4600 config ssid exit Page 11 How To Configure the WLAN with QoS alliedtelesis com BridgeO station role root bridge Assign the static IP address T WR4600 config interface vlanl1 1 T WR4600 config if no ip address dhcp T WR4600 config if ip address 10 0 0 100 24 T WR4600 config if exit Configure the station role the SSID and WMM to the radio interface 0 for bridging 600 config if 600 config if 600 config if 600 config if 600 config if ixed slot 2 600 config if ixed slot 3 600 config if 600 config if Page 12 How To Configure the WLAN with QoS 600 config interface dotilradio 0 protocol family an station role root bridge ssid ATIopen bridge group 1 traffic class voice cw min 2 cw max 4 traffic class best effort cw min 4 cw max 10 no shutdown end alliedtelesis com Bridg
5. MV Allied Telesis How To Configure the WLAN with QoS Introduction This How to Note explains how to configure Quality of Service QoS in a wireless Local Area Network to prioritize traffic under busy conditions There is an example scenario provided at the end of this document which describes the configuration for prioritizing voice traffic This example could be extended to cover a wider installation case For a complete description of the commands used in this document please refer to the following guide AT WR4600 Series Command Reference Guide PN 613 001665Rev A alliedtelesis com Trademarks The following trademarks appear in this document Ethernet is a trademark of Xerox Corporation Wi Fi Wi Fi Alliance WMM Wi Fi Protected Access WPA the Wi Fi CERTIFIED logo the Wi Fi logo the Wi Fi ZONE logo and the Wi Fi Protected Setup logo are registered trademarks ofthe Wi Fi Alliance Wi Fi CERTIFIED Wi Fi Direct Wi Fi Protected Setup Wi Fi Multimedia WPA2 Passpoint and the Wi Fi Alliance logo are trademarks ofthe Wi Fi Alliance Microsoft MS DOS Windows Windows NT and Windows Vista are either registered trademarks or trademarks of Microsoft Corporation in the United States and or other countries Other brands and productnames maybe trademarks or registered trademarks of their respective holders All other logos trademarks and service marks are the property of the
6. by delays D Background Lower Low priority traffic without throughput 1 2 coe le constraint i e file transfer LEN Page 6 How To Configure the WLAN with QoS alliedtelesis com How to configure Wi Fi Multimedia Use the command traffic class to set the EDCA back off criteria for the required WMM access category traffic class background best effort videolvo ice cw min 0 10 cw max 0 10 fixed slot 2 20 no traffic class background best effort videolvoice On collisions WMM sets the back off time within the CWmin range and uses a persistence factor PF as the coefficient that multiplies the contention window size in successive retransmission attempts following a collision WMM setup may only be entered on a wireless node with an access point role Note It will distribute the QoS policies to slave nodes for example non root bridge workgroup bridge etc Parameter descriptions cw min Contention Window minimum That is the random wait time before retrying the transmission the initial size of the contention window is within 0 CW min back off slots The value specifies the number of back off slots as a power of 2 1 in example cw min 3 means 2 1 7 back off slots cw min 0 means 2 1 0 back off slots cw max Contention Window maximum That is the maximum size of the contention window The value specifies the number of back off slots as a power of 2 1 fixed slot Arbitrary Inter Fram
7. e Space That is the predefined idle time that the station waits before starting the contention window CW The value specifies the number of back off slots Refer to AT WR4600 Command Reference Guide for default settings and Note recommended configuration for the different WLAN topologies access point bridging etc Page 7 How To Configure the WLAN with QoS alliedtelesis com Connecting AT WR4600 products There are two options for accessing the Command Line Interface of the devices SSH remote shell using any text mode SSH client software RS 232 Line Driver Receiver that provides a standard DTE console interface note this is optional and is not always available Accessing the device via SSH The Secure Shell SSH is an encrypted networking protocol allowing the user to configure the device through an Ethernet network Microsoft does not supply SSH tool You can use an alternative program such as Tera Term Pro which is licensed under GPL2 The device is factory configured with the static IP address 192 168 1 1 If the device is receiving an address from a DHCP server please checkthe assigned IP address Accessing the device via RS 232 To access the device you can use either the build in Microsoft HyperTerminal note it was removed from Windows Vista and later versions or an alternative program such as Tera Term Pro The settings of the serial terminal are as follows Stop bi Flow contro Pa
8. e1 station role non root bridge AP 1 station role root access point Assign the static IP address T WR4600 config interface vlanl1 1 T WR4600 config if no ip address dhcp T WR4600 config if ip address 10 0 0 1 24 T WR4600 config if exit Configure the station role and the SSID to the radio interface O for bridging 600 config if 600 config if 600 config if 600 config if 600 config if 600 config if 600 config if 600 config if 600 config if 600 config if 600 config if ixed slot 2 600 config if ixed slot 3 600 config if 600 config if Page 13 How To Configure the WLAN with QoS 600 config interface dotilradio 0 protocol family an station role non root bridge ssid ATIopen bridge group 1 no shutdown exit 600 config interface dotilradio 1 protocol family bg station role root access point ssid ATIopen bridge group 1 traffic class voice cw min 2 cw max 4 traffic class best effort cw min 4 cw max 10 no shutdown end alliedtelesis com Bridge2 station role non root bridge Assign the static IP address AT WR4600 config interface vlanl 1 AT WR4600 config if no ip address dhcp AT WR4600 config if ip address 10 0 0 2 24 AT WR4600 config if exit Configure the station role and the SSID to the radio interface for bridging P Allied Telesis 600 config inte
9. ge 8 How To Configure the WLAN with QoS alliedtelesis com Accessing the CLI Enter the login and password via the terminal console SSH or RS 232 Note by default the login name is manager and the password is friend AT WR4600 login manager Password Feb 9 10 35 07 AT WR4600 auth info login 6898 root login on ttyS0O AA TTTTTTTTTTTTTTTTTT 0oooo AAAAA TTTTTTTTTTTTTTT 0oooooooo AAAAAAAA m py mpm l1 590960 AAAAAAAAAAA TTTTTTT IIIIIIIIII AAAAAAA AAAAA TTTT IIIIIIIIII AAAAAAA AAAAA T IIIIIIIIII Copyright C 2012 Allied Telesis International All rights reserved AT WR4600 gt enable Password AT WR46 00 Page 9 How To Configure the WLAN with QoS alliedtelesis com Configuration example This configuration example starts with the Command Line Interface already set to Global configuration mode T WR4600 configure terminal T WR4600 config On setup completion run the command show running config to verify the applied configuration All of the examples in this document provide the minimum set of commands Note useful for configuring the WWMM regardless of other services like bridging and security etc Using QoS to prioritize voice traffic This example applies the QoS policy to support voice traffic Wireless nodes belong to a Wireless Distribution System working in 5GHz bands while the access to a wireless LAN is offered in 2GHz bands 10 0 0 0 24
10. ir respective owners where marked or not Which products and software version does this document apply to This document applies to the following Allied Telesis products Table 1 Allied Telesis network products Product Software Description and Notes Version AT WR4662n 1 1 b248 onward High Speed Mobility Wireless base router IEEE 802 11a b g n dual radio 2x2 MIMO AT WR4652 80 1 1 b248 onward High Speed Mobility Wireless mobile router pues eee IEEE 802 11a b g n dual radio 1x1 MIMO AT TQOOxx Cables and accessories pes LS Note Selection is application dependent AT 6101G IEEE 802 3af Gigabit Ethernet PoE Injector Note Use itto inter connect AT WR4662n Page 2 How To Configure the WLAN with QoS alliedtelesis com Table of contents INtFOd U CH ON mese MERI E ensais 2 Which products and software version does this document apply to esses 2 Table of contelhits e ttes HEINRICI A EET 3 a HE 4 Whatis Wi Fi Multimedia WIMM ettet inn teatri ntm iota sock ceo ag ona doen oat 4 Why use Wi Fi Multimedia eese es eseeee ee eenene o areia neto tenete toten nete teen tnn N oe ntn pa Kaeni 4 How Wi Fi Multimedia WOFks rrr teret tr eet dirai rsi pA Ei KEE ER SiNi Kaia isas 5 How to configure Wi Fi Multim edia
11. nagers to prioritize traffic based on bandwidth requirements especially delay sensitive applications such as Voice over Wireless LAN and streaming multimedia QoS policies play a key role when traffic load exceeds the capability of network resources or when some applications like file transfers consume the available bandwidth Based on services classification WMM individually manages the traffic classes to provide low latency reliability and a more predictable delay to critical services Page 4 How To Configure the WLAN with QoS alliedtelesis com How Wi Fi Multimedia works In the IEEE 802 11 standard the wireless nodes access the medium using the listen before talk algorithm CSMA CA based Distributed Coordination Function DCF The wireless node transmits a frame once its checks indicate that the medium is free for a period of distributed inter frame space DIFS and a random back off time has elapsed Otherwise it defers the frame delivery Note that contention reduces the available bandwidth because nodes must back off before retrying to communicate DCF offers an efficient mechanism for transferring bursty traffic but all nodes use the same access method consequently a real time data source will face continuous contention with a large data transfer happening at the same time WMM provides two features that resolve contention and enable QoS Enhanced Distributed Channel Access EDCA Hybrid Controlled Channel
12. rface dotilradio 0 600 config if 600 config if 600 config if 600 config if 600 config if 600 config if protocol family an station role non root bridge ssid ATIopen bridge group 1 no shutdown end the solution the network North America Headquarters 19800 North Creek Parkway Suite 100 Bothell WA 98011 USA T 1 800 424 4284 F 1 425 481 3895 II Tai Seng Link Singapore 534182 T 65 6383 3832 F 65 6383 3830 EMEA amp CSA Operations Antareslaan 18 2132 JE Hoofddorp Netherlands T 31 23 5656800 F 31 23 5575466 Asia Pacific Headquarters alliedtelesis com 2012 Allied Telesis Inc All rights reserved Information inthis document is subject to change without notice Allied Teksis is a trademark or registered trademark of Allied Telesis Inc inthe United States and other countries All company names logos and product designs that are trademarks or registered trademarks are the property of their respective owners PN 613 001665 Rev A
Download Pdf Manuals
Related Search