Wireless voice and QoS
I'm pretty sure I know the answer to this but I'm checking here as well.
With a Cisco WISM2, is it possible to have only voice set up for QoS? I'm not talking about having a dedicated SSID set up for wireless voice with QoS set to Platinum, but a generic SSID that will identify voice traffic and apply the correct QoS settings?
From what I've seen it's not possible. The reason I ask is we want to install softphones on our tablets and use our existing wireless network to be able to use wireless voice. However, it looks like if we set the QoS on that SSID to Platinum then ALL data on that SSID gets marked as high priority, not just voice traffic.
Am I correct?
The QOS settings in the profile on the WLC does not mark packets, it simply allows packets that were marked by the client to keep it's markings up to a set level.
If you want Wireless Voice to work on your PC's.
1. Make sure that SSID is set to Platinum (Make sure Platinum is set to a value of 6).
2. Make sure CUCM is configured to use the desired DSCP values for call control and RTP traffic.
3. Trust DSCP on the switch port connecting to the on the AP.
The risk that you take here is that it allows an application on the PC to mark it's packets up to EF and it could chew up your entire priority queue on your network. This is why most people put the wireless phones on it's own SSID.
I hope this helps.
Scape
Similar Messages
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Hello all,
I wanted to know if the WLAN on a SR520 supports QOS.
We are trying to setup a teleworker site and want to stick with the 500 family of devices. The requirement of the teleworker site is to have hard wired PCs connecting to the SR520 and a wireless phone at the teleworker site with good voice quality (QOS).
For Example, take the UC500 (not a typo UC500) and its built-in WLAN (assuming you order it this way). According to the documentation the WLAN will work with the Cisco 7921 (for example), but does not support QOS over that WLAN antenea, you must get a WAP or WLC and WAP combination to support QOS over WLAN.
I would appreciate seeing this in a Cisco official document.
Thanks, JohnThe SR520 is WMM certified, but it does not support diversity. For mixed wireless voice and wireless data deployments it should be a good choice. However, you are sayig that the PC's will be wired to the network, while the voice will be wireless. In this case, I think that more important than WLAN QoS is WAN QoS. The reason is that with this being a teleworker deployment, the 7921 will be registering to a remote UC500.
With regards to the lack of QoS/WMM support in the UC500, that has changed somehow. We still mandate that you deploy a WAP/WLC when using the 7921. But with the new SPA525 phone (wireless desk phone), CCA will push QoS configuration for the embedded and external access points, depending on the deployment model. Notice that this is possible because there are no roaming or mobile considerations (the SPA525 is a "static" phone).
Hope this helps,
Marcos -
Wireless Design - Best Practices for Data, Voice, and LBS
Hi,
I am currently in the process of designing a WLAN for a new hospital and I am getting some push back from my sales team. The requirements of the WLAN are data, voice, and location based services (RFID for medical equipment) ... needs to be 2.4 GHz for Guest and some apps/clients but primarily 5 GHz for most of the clients ... lastly needs to be N compatible for future use.
So, I did a predictive design with 1252's on the perimeter with 2.4 and 5 GHz patch antennas and 1142's in the middle to fill gaps ... I also scoped out 2 5508 for redundancy .... total design with -65 at my edges was 169. However, this is getting push back because of several cost issues ....
1. The bundle that Cisco offers for 5 100 AP license 5508 WLC is cheaper than buying 2 250 AP licenses WLC's ... which doesn't make any sense to me because I think 5 devices is over kill
2. The sales engineer is concerned about the power issues with the 1252's ... customer would rather not use power injectors ... and although they would have 6500's at there core ... they would only have basic switches in their IDF's so I wasn't sure which POE Switches would be able to handle 1252 but cost was an issue there as well
So, for my understanding when you are doing a WLAN design for LBS it's always best to have APs or antennas on the perimeter for better triangulation ... it makes more sense to me to do that with patch instead of Omni's ... however my sales engineer wants to use all 1142's ... so my question is what are the pro and cons behind using all Omni's or using Patch and Omni's?
Furthermore, if anyone has any documentation supporting why I would not use all Omni's that would be great because all the articles I have read on LBS just state that placement of APs is critical but doesn't give no specifics on whether it's a good practice to place them on the perimeter using a specific type of antenna or what.
Thanks in advance for you help and any ideas about this design!!!1. The 5508 is expensive because it's alot faster than the 4400 plus there are some features exclusive to the 5508 such as OfficeExtend. As the old network design adage goes: Your design can be done correctly, cheap or fast. Choose two.
2. The 1250 requires 19.5w of power to enable FULL MCS rates to both radios. Only the 3560E, 3750E or the Sup720 is capable of supporting that. Upgrading the IOS of the 1250 to 12.4(10b)JDA3 will allow the AP to operate both radios at 15.4w BUT at a lower MCS rates. Correct placement of the AP and the correct use of the antennaes will also help in the signal distribution.
3. Patch antennaes are mostly directional. The 1140 is onmi-directional BUT the signal strength is not as powrful as the 1250 at full power. The AIR-ANT2451NV is an omni-directional patch designed for the 1250.
Cisco Aironet Antennas and Accessories Reference Guide
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/product_data_sheet09186a008008883b.html
Cisco Aironet 2.4 GHz and 5 GHz Antennas and Accessories
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/product_data_sheet09186a008022b11b.html
Some of the new patch antennaes for the 1250
Cisco Aironet Dual Band MIMO Low Profile Ceiling Mount Antenna (AIR-ANT2451NV-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant2451nv.pdf
Cisco Aironet Very Short 5-GHz Omnidirectional Antenna (AIR-ANT5135SDW-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant5135sdw.pdf
Cisco Aironet Very Short 2.4-GHz Omnidirectional Antenna (AIR-ANT2422SDW-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant2422sdw.pdf
Cisco Aironet 5-dBi Diversity Omnidirectional Antenna (AIR-ANT2452V-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant2452v.pdf
Cisco Aironet 5-GHz MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT5140NV-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant5140nv.pdf
Cisco Aironet 5-GHz MIMO 6-dBi Patch Antenna (AIR-ANT5160NP-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant5160np.pdf
Cisco Aironet 2.4-GHz MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT2450NV-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant2450nv.pdf
Cisco Aironet 2.4-GHz MIMO 6-dBi Patch Antenna (AIR-ANT2460NP-R)
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/data_sheet_ant2460np.pdf -
Eight-Class Model QoS for voice and video
One of the QoS recomendation in the SRND "Enterprise QoS" is to create a Eight-Class QoS Model utilizing a seperate priority queue for voice and video.
It says that even though you have only one physical priority queue, that LLQ has an implicit policer that allows for time-division multiplexing of the single priority queue. This implicit policer abstract the fact that there is essentially a single LLQ within the algorithm and, thus, allows for the "provisioning" of multiple LLQs.
My question is if anyone has tried this and if there are any limitations on the platforms that can support this "dual-LLQ design."Design guide which is basically the QoSDesign recommendation bible.
http://www.cisco.com/univercd/cc/td/doc/solution/esm/qossrnd.pdf
It has a large section for WAN recommendations...while you may not
need to follow one of these Based on my understanding what what you
have for a link (DS3) and what you are trying to accomplish, I
believe the following section would be a good place to start.
- WAN Aggregator QoS Design
- WAN Edge Classification and Provisioning Models
- High Link Speed QoS Class Model
- Eight-Class Model -
Separate vlan for wireless voice
Hi all, I'm about to embark on reconfiguring my home lab, at present I have just 2 vlans which are for VoIP and data, I'm going to split my network so I have the following:
Data VLAN for our home PC's
Voice VLAN for phones
1 wireless VLAN for home laptops
1 wireless VLAN for games consoles
1 wireless guest access so I don't have to give out my own ssid credentials
1 Management VLAN
My question is do I have a separate VLAN for wireless VOIP or do I just use the same Voice VLAN?
Regards
Martyn
Sent from Cisco Technical Support iPad AppMartyn:
Both solutions are valid. You can use the current voice VLAN or create a new VLAN.
If you create a new VLAN you need to apply needed QoS to wired side as well.
If your current Voice VLAN is already configured for QoS then using it for wirelss voice is easier.
So the preffered option is to use your current voice VLAN for wireless voice as well.
HTH
Amjad -
Welcome to the Voice and Video over WLAN Discussion
Welcome to the Cisco Networking Professionals Connection Wireless Forum. This conversation will provide you the opportunity to discuss issues surrounding Voice and Video over WLAN. We encourage everyone to share their knowledge and start conversations on issues such as bandwidth intensive wireless applications, and any other topic concerning Voice and Video over WLAN.
Remember, just like in the workplace, be courteous to your fellow forum participants. Please refrain from using disparaging or obscene language or posting advertisements.
We encourage you to tell your fellow networking professionals about the site!
If you would like us to send them a personal invitation simply send their names and e-mail addresses along with your name to us at [email protected]This is easily done with dial peer statements . The dial peer in your originating router must route the calls to the terminating router first. That would look like :
dial-peer voice xxxxx voip ( the xxxxx is just a tag)
destination-pattern 45... (that would route any 5-digit calls beginning with 45)
session-target ipv4:xxx.xxx.xxx.xxx (ip address of the terminating router)
If digitones are to be dialed after the connection is established, use the statement:
dtmf-relay-h.245-alphanumeric
You could also use a statement to specify the codec to be used:
codec g711ulaw
You would need multiple voip dial peers if the calls were going to different routers based on the dialed digits. If all calls are sent to the same terminating router, use all wild cards in the dest-pattern statement.
At the terminating router configure pots dial peers:
dial-peer voice xxxxx pots
dest-pattern 45...
port x/x (whichever port the call is to be terminated on)
prefix 45 (this re-inserts matched digits which are stripped off by the pots dp)
Repeat for other ports which will receive calls.
Paul -
ASK THE EXPERTS : High Density Wireless Deployments and CleanAir Technology
with
Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to get an update on High Density Wireless Deployments and CleanAir technology with Cisco expert Fred Niehaus. Fred is a technical marketing engineer for the Wireless Networking Business Unit at Cisco, where he is responsible for developing and marketing enterprise wireless solutions using Cisco wireless LAN products. In addition to his participation in major deployments, Fred has served as technical editor for several Cisco Press books including the "Cisco 802.11 Wireless Networking Reference Guide" and "The Business Case for Enterprise-Class Wireless LANs." Prior to joining Cisco with the acquisition of Aironet, Fred was a support engineer for Telxon Corporation, supporting some of the very first wireless implementations for major corporate customers. Fred has been in the data communications and networking industry for more than 20 years and holds a Radio Amateur (Ham) License "N8CPI."
Remember to use the rating system to let Fred know if you have received an adequate response.
Fred might not be able to answer each question due to the volume expected during this event. Remember that you can continue the conversation on the shortly after the event. This event lasts through June 3, 2011. Visit this forum often to view responses to your questions and the questions of other community members.You are correct, between the higher numbers of users with multiple devices the bandwidth requirements keep increasing.
The limitation of three non-overlapping channels in the 2.4 GHz space is driving more customers to 5 GHz, it is important to have both bands when high density deployments are needed. While many older devices only support 2.4 GHz, we are now seeing far more devices with 5 GHz as well.
The recomendation of 20-25 clients and 8 voice calls on a given 2.4 GHz channel is still a good "rule of thumb" with actual customer data requirements driving those numbers higher or lower. You are right when you say "throwing Access Points" at the problem can degrade the wireless quality as co-channel interference and overall noise floor can rise with multiple Access Points that can all hear each other.
A better approach to the problem is to throw more spectrum at this issue (using 5 GHz channels) and elements of 802.11n (20 MHz) bandwidth on 2.4 GHz.
What we have been doing in high density deployments is to try to minimize the propagation of a cell and focus it in a given direction. This can be done by
1. Managing the RF power of the radios (Access Points) and in some cases the client's power (using elements of CCX).
2. Using the right antennas to shape both Tx and Rx cell size to help isolate, we have recently introduced a new high gain antenna for stadiums that does this well.
3. Limit supported rates, obviously the higher the data rate the less sensitive the receiver is and the smaller the cell size becomes.
4. Enable 5 GHz (that adds far more channels for data throughput)
5. Limit the number of SSIDs in use as each requires a separate beacon (adding to RF utilization)
6. Co-locating access points with non-overlapping channels
There are some challenges, for example; many dual -band clients prefer to connect to 2.4 GHz, and 2.4 GHz is more likely to be busier and subject to interference, so we also enable Cisco "Band-Select" which basically "nudges" those clients off 2.4 GHz and pushes them to 5 GHz so as to free up the 2.4 GHz band when we can determine the client has 5 GHz capability.
So how is this done? well, we do this by listening to the clients and if we detect that the client is sending out probe requests on both bands we know the client can use 5 GHz so we essentially make the 5 GHz band "appear more attractive" to that client.
Note: Client load balancing and Band select are features in the Cisco Unified controller menu.
Also enabling client link (intelligent beam forming) helps direct the signal directly at the client and reduces same channel interference. -
Subject: SNA/QOS
I AM CURRENTLY RUNNING 12.1(11a) IOS ON A ROUTER BASED NETWORK WITH FOUR
7500 ROUTERS. I AM CURRENTLY RUNNING CUSTOMER QUEUEING AS MY QOS. I AM
NOW LOOKING TO USING LLQ W/ CBWFQ AND DISTRIBUTED MODES, AS WELL. I HAVE
VIP-40 CARDS IN ALL ROUTER. HOWEVER, MY NETWORK IS COMPOSED OF --
TP0 - BATCH TRAFFIC
TP1- INTERACTIVE TRAFFIC
TP2-CONTROLLED TRAFFIC - HIGH AMOUNTS
I HAVE BEEN TOLD THAT CISCO'S QOS WILL SUPPORT TP1 TRAFFIC SO, I AM
CONCERNED ABOUT MY TP2 (CONTROLLED TRAFFIC) AND IF I CAN IMPLEMENT LLQ/CBWFQ
INTO MY NETWORK.
I WOULD LIKE TO IMPLEMENT THIS FOR MY CRITICAL APPS SUCH AS SNA, AND HTTP
WEB BASED APPS. THUS, LIMITING MY SQL, FTP AND TELNET TRAFFIC.
THANKS IN ADVANCE.
ANY PPT FILES WOULD BE APPRECIATED.Hi Connie,
You open the door to an interesting discussion, by including both SNA and QoS in your question. As you know, a variety of QoS mechanisms have been available for SNA traffic for quite a while. I can't tell from your description what sort of traffic is contained in "TP2-CONTROLLED", so I will assume it is voice and video traffic, and not the "TP2" from OSI Transport Protocols.
The quick answer is that you can definitely support TP1 traffic while protecting the quality of your TP2 traffic. Essentially you decide what percentage of the available bandwidth to allocate to each class of traffic, providing a minimum guaranteed value. In addition, there is a special class, Low Latency Queuing (LLQ), available for delay and jitter sensitive traffic such as voice. Within each traffic class, IOS will then provide Weighted Fair Queuing (WFQ) for each unique flow (session). This becomes a bit more interesting when combined with different WAN types such as frame relay and ATM, you can take advantage of the VIPs that you mention, and there are considerations for low speed circuits. So here are a couple of URLs that provide more information.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/qos_c/qcprt2/qcdconmg.htm
http://www.cisco.com/univercd/cc/td/doc/product/voice/ip_tele/avvidqos/qoswan.htm
Coming back to the SNA traffic, I assume you're currently using custom queuing with DLSw+, using the priority parameter to create four TCP connections, and classifying traffic using one of the three available methods. In moving to a CBWFQ model, you will want to map the existing custom queues into the newly created classes. In other words, you can continue to use the same classification techniques, while changing to the easier to define, and more efficient WFQ for output queue processing.
The absolute best traffic classification comes with using the Enterprise Extender (EE) feature of SNASw. When SNA traffic is sent across an EE link, the precedence bits in the IP packets are automatically marked with the same values that are used in the SNA Class of Service (CoS). Since SNASw is our APPN node implementation, propagating the precedence markings from SNASw to DLSw+ also provides an automatic means of classifying the SNA traffic.
Rgds, Dan -
Hi all,
I am new in QoS and trying to apply it in two of my voice links. I have
a voice circuit (1xE1) between our office and HQ in USA and another
voice circuit (3xE1) with another branch. I have only voice and
signaling traffic on the USA circuit and the encapsulation is HDLC. For
the brach office the 3xE1 links are bonded by MLPPP and I have voice,
signaling and data. I am using a thrid party device to compress the
voice (G.729A) and signaling (SIGTRAN) and that device can put ToS bit
in voice and signal packet. Now here is what I want to do..
1. For USA circuit I want to give higher priority to signaling by
putting ToS bit in my compression device. Can the router detect that?
Do I have to do any additional QoS configuration in the router?
2. For Brach office I want to have Signaling higher proirity, next
voice and default priority to data. Same like USA circuit, I cam put
ToS bit for signaling and Voice but as data is not passing through the
compression device I cannot put ToS there.
It would be very nuch helpfull, if anyone can send some sample
configuration or links to solve my problem.
Thanks in advance.
~/OviTry these links:>
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094660.shtml
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800bd9ec.html
http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080160fc1.shtml -
I understand that a voice over wireless deployment needs its own VLAN but the question is what is the best practice size of the single voice vlan? Once exceded what is the best practice subnet size for AP Groups?
William,
You will get many different answers here:) So in my experience, a /24 is good, you keep the broadcast domain small. I have also had clients with a /16 and no issues, but not with voice since that would be a lot of wireless phones in general. I think the largest subnet I had wireless voice, my client was using a /23 subnet.
AP Groups woul be the same in a way, you need to define how large of a subnet you need. With the 7.0.116.0, they added a new feature called interface groups that allows you to bundle interfaces together. So you can bundle 2+ /24 if you wanted to.
Thanks,
Scott Fella
Sent from my iPhone -
Dear forum members, I have deployed quite a few WLAN environmnets but none so far for
Wireless VoIP.
If I have to design a system for both data and Voice isnt reccomended to create 2 VLANs/ 2 SSIDs, one for voice and one for Data?
Also what needs to be done on the Controller to accomodate the Voice? what are the authentication mechanisms?
Anyone has any great document to share?
i would appreciate your help on the matter.
ASPlease don´t forget:
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http://www.cisco.com/en/US/docs/wireless/technology/vowlan/troubleshooting/VoWLAN_Troubleshooting_Guide.pdf
Peter
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Software record voice and video
Dear All,
Do you know software record voice and video after record we can copy to Laptop...... Does everyone know this program??
Best Regards,
Rechardgriffin's italk records voice. and after you record, you can transfer it wirelessly to a computer on the same network. you need to download a small program from griffin tho. it works really well, i'm very pleased with it. and best of all, its free. look for it in the app store.
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Wireless modem and Airport Express.. one at a time
Recently my internet provider upgraded my old plug in modem to a newer wireless model. Now it seems that the current setting allow communication with only one or the other at the same time. If I want to be online with the wireless modem and send my iTunes music via Airport Express to my sound system, no dice. I have to either click on the modem up in the Airport choices to be online and listen to iTunes through the computer speakers, or go offline to listen to music through the sound system and Airport Express.
I'm sure I'm just missing something in preferences or settings somewhere.
Can someone point me in the right direction?
Thanks, and Happy New Year!No ideas?
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The Difference between Extending a Wireless network and WDS?
I have an Extreme (n) and an Express (n).
I want to make sure the signal is strong upstairs and share a printer (connected to the express) and use AirTunes. I also may add an external drive to the Extreme.
What's the difference between Extending a Wireless Network and using WDS? Will there be a speed difference?
Message was edited by: J. Christopher EdwardsI think you don't get it
If I have another draft N router that operates at 2.4G and I have only n devices I can still use WDS and it will connect using draft n in the 2.4G band.
If one g device connects to the network will go in mixed mode.
The AEBS will still report 130 Mbps for your n clients and 54 for your g clients.
If the other router is g only obviously you can't connect between the two router at n mode but still the AEBS will be in mixed mode and not in g. The Extreme will still report 130 Mbps for the connected n clients.
I can tell you that because I have actually implemented it am not taking off the documentation.
The same device if I try to use the "extend n network" does not even see the AEBS but will happily keep the n in the WDS mode and though the bandwidth is halved it is still more than g.
In any case enough for this! -
Suddenly My iphone 4s does not find my wireless printer and sometimes can't find the server.
All of a sudden My iPhone 4s cannot find my wireless printer and cannot connect to the internet all of t he time.
Hi dbutkow,
If you are having Wi-Fi or network connectivity issues, you may want to take a look at the troubleshooting steps outlined in this article:
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
Cheers,
- Brenden
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