with live demos classroom (video) admin (data) admin (voice) faculty (data) faculty (voice) layer 3...
TRANSCRIPT
Craig Hill, Mariusz Ostrowski, Justo Oreja VegaUC ArchitectsMicrosoft Corporation
Enterprise Networking with Lync 2013: Network Bandwidth and QoS Requirements
Have a better understanding of broad scope of QoS, not just Lync aspect of it.
Discuss Lync 2013 bandwidth requirements.
Session Objectives
IntroductionQoS basicsQoS and Lync 2013Network bandwidth for Lync 2013 (especially video)
Agenda
with LIVE
DEMOs
Introduction
Lync adds new traffic in the networkNetworking can help us build our credibilityReduce support cases - Statistics from Premier
Why is network planning important?
Customer Impact
Networking Review – Impairments
Latency, jitter, packet lossWhat are they?Do they affect just Lync audio (voice) ? How about video ? Can they affect my other Lync traffic (e.g. IM/P) ?
QoS basics
QoSWhat is QoS?Quality of Service (QoS) is a combination of networking technologies that enables organizations to optimize the end-user experience for real time audio and video communications
When is QoS needed?QoS is commonly used when network bandwidth is limited(which in practice means – almost always)
QoS is needed when there is a possibility of network congestion(which again means – almost always)
QoS is the end-to-end thing
Lync Server 2013 Networking Guidehttp://blogs.technet.com/b/nexthop/archive/2013/06/04/lync-server-2013-networking-guide-network-planning-monitoring-and-troubleshooting-with-microsoft-lync-server.aspx
“QoS helps to guarantee the bandwidth available for configured traffic flows. […]
Configure QoS end-to-end.”
QoS – a Word from Microsoft IT
“The importance of QoS cannot be overstated in our 100,000+ user Enterprise Voice production environment.
In many instances of voice quality issues, the root cause was that QoS settings were not applied end to end
We experienced a significant increase in quality after uniformly enforcing and auditing QoS settings.”
“Optimizing Lync 2010 Enterprise Voice Performance”:http://technet.microsoft.com/en-us/library/jj650858.aspx
QoS mechanisms
Bottom line - treat different types of traffic differentlyBased on defined traffic classes
Different treatment = different QoS mechanismsQueuing is the most commonShaping and congestion avoidance are the other ones
How network devices distinguish various traffic typesPort VLANs 802.1p/CoS DiffServ/DSCP/TOS/IP Precedence MPLS TAGs
QoS – traffic classification vs. marking
QoS – traffic classification methods (L2)VLAN priority
All traffic on a certain VLAN is assigned to a certain traffic class (e.g. Voice VLAN)
Typical in legacy VoIP / IPT environments with just IP phones (i.e. no soft-clients)
802.1p markingL2 priority mechanism, cannot scale beyond L3 (IP subnet) boundary
Only available on Ethernet links with 802.1q tagged VLAN
A Short Overview of QoS Mechanisms and Their Interoperation:http://technet.microsoft.com/en-us/library/bb742477.aspx
QoS – traffic classification methods (L3)Port based
All traffic arriving from or destined to a certain UDP or TCP port(s) is assigned is to the same traffic class
Cumbersome in configuration and maintenance, thus not really appreciated by “networking people” (except when used for initial marking or re-marking)
DSCP marking (most ubiquitous and recommended)
Simplifies end-to-end QoS design and scales easily (if supported in HW at line rate)
Builds on top of earlier IP Precedence (TOS) approach
Based on marking that can be assigned (sometimes is assigned by default) by most IP phones and custom video devices
PCs are also capable of DSCP marking, and if that is trusted – classification of this type can be used
A Short Overview of QoS Mechanisms and Their Interoperation:http://technet.microsoft.com/en-us/library/bb742477.aspx
QoS - queuing
QoS based on DSCP markings - exampleYes, these things can get really complex…
Beware of different QoS Policies
Classroom (video)
Admin (data)Admin (voice)
Faculty (data)Faculty (voice)
Layer 3 link
Classroom (video)
Main campus – QoS domain #1 Remote site – QoS domain #2
QoS Policy (5 classes)
802.1p value DSCP queueVoice: 6 46 7Video: 5 36 6Signaling: 4 26 5Default: 0 0 3Scavenger: 1 14 1
QoS Policy (3 classes) 802.1p value DSCP queueVoice: 6 46 4Video: 5/4 36/26 3Default: 0/1 0/14 1
QoS and Lync 2013
QoS for Lync – what Lync client has to doIf Lync marks its traffic, then network can do the jobApply DSCP traffic marking via GPO
Managing Quality of Service (QoS) in Network Planning for Lync Server 2013:http://technet.microsoft.com/en-us/library/gg405409.aspx
Microsoft Lync Server 2010 Quality of Service (QoS) Deployment Guidehttp://www.microsoft.com/en-us/download/details.aspx?id=12633
Enabling QoS for Lync Server 2013https://www.shudnow.net/2013/02/16/enabling-qos-for-lync-server-2013-and-various-clients-part-1/
QoS for Lync – non-client Lync trafficServer-initiated Lync trafficInternet based (remote) Lync clientsLync IP phonesTraffic coming from the SIP Trunk
Managing Quality of Service (QoS): http://technet.microsoft.com/en-us/library/gg405409.aspx
QoS for Lync – which DSCP values to use?Lync Server 2013 Networking Guidehttp://blogs.technet.com/b/nexthop/archive/2013/06/04/lync-server-2013-networking-guide-network-planning-monitoring-and-troubleshooting-with-microsoft-lync-server.aspx
“A good starting point would be to configure all voice real-time traffic to use DiffServer Code Point 46, with video configured for 34. Configure SIP Signaling traffic to use 24. Mark other modalities according to business requirements.
Because these are only recommendations, make sure that you’re using the markings that have been agreed upon as part of your enterprise’s existing QoS strategy.”
Validate end-to-end QoSBeware of incorrectly configured network devices (routers, wireless access points, switches) which might:• set or change DSCP markings to something you did not
intend• strip DSCP markings (set to 0)
Validating QoS on Lync Endpoints:http://blogs.technet.com/b/nexthop/archive/2012/12/19/validating-qos-on-lync-endpoints.aspx
Monitoring the QoS Lync Monitoring Server is your best friendIn Lync 2013 the Monitoring Server role is co-located with a Front End
Demo
Demo #1 (Ideal World vs Reality)Lync and impact of network impairments
Demo #1
Site E is connected using 512 Kbps WAN link
File
transfer
Lync P
2P
call
CLIENTA and CLIENTB will be in a Lync P2P audio call Then CLIENTE will initiate file transfer to DC1
Demo #2
Lync QoS/DSCP – applying, troubleshooting and monitoring
Demo #2
Situation like in Demo #1CLIENTA and CLIENTB are in a Lync P2P audio call CLIENTE has a file transfer to DC1
File
transfer
Lync P
2P
call
Lync QoS (DSCP marking) enabled in CLIENTA and CLIENTB
QoS (priority queue) enabled in WAN router
Network Bandwidth for Lync 2013
Network / Bandwidth EstimationLync Server 2013 Networking Guidehttp://blogs.technet.com/b/nexthop/archive/2013/06/04/lync-server-2013-networking-guide-network-planning-monitoring-and-troubleshooting-with-microsoft-lync-server.aspx
“2.3 Bandwidth Estimation
Bandwidth estimation is the key consideration when deploying Lync Server. Actually, network estimation would be a more apt term, because the communication streams within Lync Server rely more on latency and packet loss than they do on raw available network bandwidth.
To understand the role of network estimation, you must also recognize the various communication flows within Lync Server. Coupled with the user personas, you can then use this information within the Lync Bandwidth Calculator to understand, per modality, the volume of traffic that using Lync Server will likely generate.”
Changes in Lync 2013 vs. Lync 2010 flowsLync 2013 video flows and bandwidth consumptionModeling with Lync 2013 Bandwidth Calculator
Network Bandwidth for Lync 2013
Lync 2013 user-generated traffic flows which have not changed from Lync 2010 (or not that much )SIP signaling, including IM and presencePeer-to-peer audio (*) Multiparty audio (*)PSTN audioDesktop/application sharing
* Lync 2013 introduces G.722 Stereo codec with Lync Room System
Lync 2013 user-generated traffic flows which have dramatically changed from Lync 2010Peer-to-peer video
Lync 2013 introduces H.264 SVC Stereo codec with temporal scalabilityLync 2013 can use RTVideo (VC-1) codec for backward compatibility (simulcast)Lync 2013 supports plethora of resolutions from sub-CIF to Full HD
Multiparty videoLync 2013 introduces MultiView gallery (simulcast)
Lync 2013 video flowsand bandwidth consumptionDISCLAIMER: I don’t want to cause you a headache
Lync 2013 – Video peer-to-peer
P2P with H.264 SVC4:3 and 16:9 aspect ratios (+20:3 for Panorama)Broad range of resolutions from sub-CIF up to 1080pBandwidth requirements depend on:
Video window size (user behavior)PC capabilities (CPU cores, HW acceleration)
Typical vs. Maximum 460 Kbps typical for common window size distribution4010 Kbps maximum for Full HD
Add 10 Kbps for RTCP
Lync 2013 Front End Server
Central Site
Branch Site 2
Branch Site 1
Lync 2013 – Video peer-to-peer
P2P with H.264 SVC4:3 and 16:9 aspect ratios (+20:3 for Panorama)Broad range of resolutions from sub-CIF up to 1080pBandwidth requirements depend on:
Video window size (user behavior)PC capabilities (CPU cores, HW acceleration)
Typical vs. Maximum 460 Kbps typical for common window size distribution4010 Kbps maximum for Full HD
Add 10 Kbps for RTCP
RTVideoBackward compatibility with Lync 2010 clients
Lync 2013 Front End Server
Branch Site 2
Branch Site 1
Central Site
Lync 2013 – Window size impact on videoWindow size / screen real estateSize of Lync video window can be adjusted by the Lync user at any time (up to the size of screen real estate)
Video impactVideo streams are re-requested by the receiving Lync client with either higher (= more bandwidth) or lower resolution (= less bandwidth)
Understanding Lync Video Reportshttp://blog.schertz.name/2013/06/understanding-lync-video-quality-reports/
Lync 2013 – Network impact on videoBad network conditionsBad network conditions (especially significant packet loss) can force Lync client to re-request video stream from sender
Video impactVideo streams are re-requested with lower resolution (= less bandwidth)
Video resolution decreased
Lync 2013 – Video conferencing
MultiView with H.264 SVC
Branch Site 3
Branch Site 2
Branch Site 1
Lync 2013 Front End Server
with AVMCU
Central Site
Lync 2013 – Video conferencing
MultiView with H.264 SVCMultiple video streams in 16:9 aspect ratios but clipped to square ”tile”
Add 10 Kbps for RTCP
Branch Site 3
Branch Site 2
Branch Site 1
Lync 2013 Front End Server
with AVMCU
Central Site
Lync 2013 – Video conferencing
MultiView with H.264 SVCMultiple video streams in 16:9 aspect ratios but clipped to square ”tile”Max 5 active video tiles, but typically only 2-3Same range of resolutions from sub-CIF up to 1080pbut in reality single tile resolution typically 240p
Add 10 Kbps for RTCP
Branch Site 3
Branch Site 2
Branch Site 1
Lync 2013 Front End Server
with AVMCU
Central Site
Lync 2013 – Video conferencing
MultiView with H.264 SVCMultiple video streams in 16:9 aspect ratios but clipped to square ”tile”Max 5 active video tiles, but typically only 2-3Same range of resolutions from sub-CIF up to 1080pbut in reality single tile resolution typically 240p
Simulcast – multiple streamsMultiple active video tiles (downstream)Various resolutions required (upstream)
Add 10 Kbps for RTCP
Branch Site 3
Branch Site 2
Branch Site 1
Lync 2013 Front End Server
with AVMCU
Central Site
Lync 2013 – Video conferencing
MultiView with H.264 SVCMultiple video streams in 16:9 aspect ratios but clipped to square ”tile”Max 5 active video tiles, but typically only 2-3Same range of resolutions from sub-CIF up to 1080pbut in reality single tile resolution typically 240p
Simulcast – multiple streamsMultiple active video tiles (downstream)Various resolutions required (upstream)
Multilayer – temporal scalability Add 10 Kbps for RTCP
Branch Site 3
Branch Site 2
Branch Site 1
Lync 2013 Front End Server
with AVMCU
15 fps
Central Site
Lync 2013 – Video conferencing
MultiView with H.264 SVCMultiple video streams in 16:9 aspect ratios but clipped to square ”tile”Max 5 active video tiles, but typically only 2-3Same range of resolutions from sub-CIF up to 1080pbut in reality single tile resolution typically 240p
Simulcast – multiple streamsMultiple active video tiles (downstream)Various resolutions required (upstream)Lync 2010 clients present (upstream and downstream)
Multilayer – temporal scalability Add 15 Kbps for RTCP (because of Lync 2010 clients)
Branch Site 3
Branch Site 2
Branch Site 1
Lync 2013 Front End Server
with AVMCU
Central Site
15 fps
Lync 2013 – Data sharing impact on videoData sharingOccupies major part of a screen, when used with video on the same screen
Video impactDesktop sharing reduces tile size (typically to 180p) Video streams are re-requested with lower resolution (= less bandwidth)
Lync 2013 MultiView Gallery conference with video - resolutions and bandwidthshttps://campus.partners.extranet.microsoft.com/MSEngageKBDocuments/72013/Lync%202013%20MultiView%20Gallery%20conference%20with%20video%20-%20resolutions%20and%20bandwidths.docx
Lync 2013 – Multi-screen impact on videoMulti-screenData sharing occupies first screen, and second screen is used exclusively for video experience
Video impactDedicated screen real estate allows to increase tile size (back to 240p or maybe more) Video streams are re-requested with higher resolution (= more bandwidth)
Lync 2013 MultiView Gallery conference with video - resolutions and bandwidthshttps://campus.partners.extranet.microsoft.com/MSEngageKBDocuments/72013/Lync%202013%20MultiView%20Gallery%20conference%20with%20video%20-%20resolutions%20and%20bandwidths.docx
Lync 2013Typical Video Bandwidth
The way to avoid the headache
New model needed for Capacity Planning!Typical Video Bandwidth in Lync 2013 (for P2P video calls)
Model is based on data from Lync 2013 Preview deployments at Microsoft and TAP customers
Video usage (not BW!) doubled compared to Lync 2010
P2P video calls:
Heavily depends on user behavior
Plenty of resolutions possible from 180p to 1080p
~75% of users with default video resolution of 424x240
~25% increase video window to obtain 640x360 or HD video
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P2P calls: Send/Receive BW
Average send/receive Kbps per user
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New model needed for Capacity Planning!Typical Video Bandwidth in Lync 2013 (for conference video)MultiView conference video calls:
Depends even more on user behavior
Typical screen real estate allows for tileswith resolution of 424x240 (clipped to square)
Data sharing reduces screen real estate for video in most conferences
Not all users actually use video Receive: average of 2.5 video streamsSend: average of 1.6 video streams
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New model documented at TechNet
For the main video the typical and maximum stream bandwidth is the aggregated bandwidth over all received video streams and over all send video streams respectively.
Even with multiple video streams the typical video bandwidth is smaller than in the peer-to-peer scenario because many video conferences are using content sharing that leads to much smaller video windows and thus smaller video resolutions.
http://technet.microsoft.com/en-us/library/jj688118.aspx
Typical vs. Maximum – which should I use?
Typical - average consumption of bandwidth, seen in rather large population of Lync users, who also behave more-less “normally”
Maximum – maximum consumption of bandwidth, dealing with rather small population of users, or if you would suspect that users you are dealing with have quite unusual speech patterns
http://technet.microsoft.com/en-us/library/jj688118.aspx
Typical vs. Max
Typical vs. Max
It’s ”just” the tool for modeling the bandwidth consumption, so you must use your head as well
Information on Lync design is needed or some assumptions must be made
Consult the User Guide, ask [email protected] when unsure, and send us feedback !
Lync 2013 Bandwidth Calculator
Lync 2010 and 2013 Bandwidth Calculator http://www.microsoft.com/en-us/download/details.aspx?id=19011
Lync 2013 special cases for Video Bandwidth (LRS, Lync 2013 Mobile)
Sorry, but the headache might be back
Bandwidth for Lync Room Systems
LRS is 90% like Lync 2013 client, but …Audio - G.722 Stereo is used for audioVideo - oh, LRS has very large screen(s), so…Amount of screen real estate allows for larger resolutions in both P2P video and MultiView gallery
Default video user experience on LRS is differentLync P2P video calls to/from LRS start in full screen mode on LRS screen (UI suppression)• means larger resolution to LRS (expect 720p or 1080p stream from the very beginning)When LRS joins Lync 2013 video conference in MultiView gallery mode:• amount of screen real estate allows for video tiles with larger resolutions• 2-screen LRS might go for even higher resolutions since video tiles are distributed on
both screens
Bandwidth for Lync 2013 Mobile clientsDevice platform impacts capabilities and thus bandwidth (especially for video)Screen real estate limitationsPerformance limitations (factors: CPU power, hardware offload – WP8 only)Lync 2013 Mobile is not using RTAudio (Siren - P2P audio, G.722 - conf audio, G.711 - PSTN audio)Lync 2013 Mobile client is leveraging H.264 SVC and can rely heavily on temporal scalability
Network type (WiFi vs. 3G/4G) might have impact
Mobile Client Comparison Tables: http://technet.microsoft.com/en-us/library/hh691004.aspx
Summary
Session Objectives: Have a better understanding of broad scope of QoS, not just Lync aspect of it.Discuss Lync 2013 bandwidth utilization.
Key TakeawayProper network planning and interaction with networking team are key factors for quality of Lync audio and video.
Session Objectives And Takeaways
References
Lync Server 2013 Networking Guide (version 2, updated in January 2014)
http://blogs.technet.com/b/nexthop/archive/2013/06/04/lync-server-2013-networking-guide-network-planning-monitoring-and-troubleshooting-with-microsoft-lync-server.aspx
Enabling Quality of Service with Microsoft Lync Server 2010 http://www.microsoft.com/en-us/download/details.aspx?id=12633
Validating QoS on Lync Endpoints http
://blogs.technet.com/b/nexthop/archive/2012/12/19/validating-qos-on-lync-endpoints.aspx
Understanding QoE Alerting http://www.microsoft.com/en-us/download/details.aspx?id=9129
Lync 2010 and 2013 Bandwidth Calculator http://www.microsoft.com/en-us/download/details.aspx?id=19011
Related Content
Q&A
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