1. 5 | Understanding Network Controls and Solutions

2. Planning Quality of Service
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Planning Quality of Service
07: Understanding Network Controls and Solutions
Planning considerations include the ability to:
Define QoS classification:
Different types of network traffic, with port-based and protocol-based traffic are the most common classification methods
Watch QoS policies implemented on existing switch infrastructures:
They can help ensure that client DSCP markings are not stripped or reset
Achieve guaranteed QoS by enabling DSCP marking of packets as they leave communication endpoints
Be sure to relate your coverage of QoS to network assessment, and not get too entrenched into QoS on its own.

3. Configuring Quality of Service
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Configuring Quality of Service
07: Understanding Network Controls and Solutions
Considerations include the ability to:
Verify that the QoS markings in place throughout the network are legitimate:
Avoids configuration issues on the switch infrastructure
Review the planning requirements for network port usage
Address common questions about manual port configuration scenarios such as:
Is it possible to assign a dedicated number and range of ports per Skype for Business Server modality?
What are some of scenarios in which you’d recommend this?
Allocate a separate and dedicated range for each Skype for Business Server modality

4. Creating Quality of Service Policies
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Creating Quality of Service Policies
07: Understanding Network Controls and Solutions
Examples of QoS settings for Internal Edge interface
Ports
Description
Used for audio, the client is configured to use 20 ports; for example, ports Other servers, such as an A/V Conferencing server, use ports
Used for video, the Skype for Business Server client is configured to use 20 ports; for example, ports Other servers, such as a A/V Conferencing server, use ports
Used for application sharing, the client is configured to use 20 ports; for example, Other servers, such as a Conferencing server, use ports
Used for file transfer, the client is configured to use 20 ports; for example This is a point-to-point file transfer only.
Use the table on the slide to explain settings for QoS

5. Overview of Call Admission Control
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Overview of Call Admission Control
07: Understanding Network Controls and Solutions
Main CAC design attributes in Skype for Business Server 2015:
It is simple to deploy and manage without additional equipment, such as specially configured routers:
Creating a complete CAC configuration depends on network complexity
Maintaining a CAC policy depends on change management processes at the network
It addresses critical unified communication (UC) use cases, such as roaming users and multiple points of presence:
CAC policies are enforced according to where the endpoint is located, not where the user is homed
It can be applied to video calls and audio/video conferencing sessions
It provides the flexibility to enable representation of various kinds of network topologies

6. Network Regions These include:
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Network Regions
07: Understanding Network Controls and Solutions
These include:
Common network region cmdlets: New-CsNetworkRegion. Get-CsNetworkRegion, Set-CsNetworkRegion, and Remove- CsNetworkRegion
Network region routes that determine which linked path the connection will traverse from one region to another
Network region links that are used to review and configure links between two network regions as part of CAC
Network inter-site policies that define bandwidth limitations between sites that are directly linked

7. Call Admission Control Best Practices
07: Understanding Network Controls and Solutions
These include the ability to:
Ensure that WANs are adequately provisioned for current and anticipated media traffic
Monitor network usage and call detail records so that you can choose optimal CAC settings and update CAC settings as network usage changes
Use CAC bandwidth policies to complement QoS settings
If you want to reroute blocked calls onto the PSTN, verify PSTN functionality and capacity

8. Call Established Over WAN
7: Skype for Business Server 2015 and Networking
A normal call over the WAN that can go through because no restrictions apply.
Using the steps on the slide, walk the students through the call-establishment process depicted on the slide.
Start at the next slide to show the sequence of the call. This slide shows all five steps in the process on one slide because that is what the student sees in their manual. Students can follow along by referring to the steps in their manual. 1 2 3 4 5

9. 1 of 5 1 20337B 7: Skype for Business Server 2015 and Networking
Start at this slide and walk students through the process.
Alice initiates a call to Bob.
Go to the next slide. 1

10. 2 of 5 1 2 20337B 7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Go to the next slide. 1 2

11. 3 of 5 3 1 2 20337B 7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Bob’s Skype for Business 2015 client checks the CAC policy to determine whether the call can be established.
Go to the next slide. 1 2 3

12. 4 of 5 3 1 2 4 20337B 7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Bob’s Skype for Business 2015 client checks the CAC policy to determine whether the call can be established.
Bob’s Skype for Business 2015 client accepts the call.
Go to the next slide. 3 1 2 4

13. 20337B
5 of 5
7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Bob’s Skype for Business 2015 client checks the CAC policy to determine whether the call can be established.
Bob’s Skype for Business 2015 client accepts the call.
The call is established and audio flows across the WAN link. 3 1 2 4 5

14. Call Rerouted Over PSTN
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Call Rerouted Over PSTN
7: Skype for Business Server 2015 and Networking
Using the steps in the table, walk the students through the call-rerouting process depicted on the slide.
Because the WAN connection has no more available bandwidth, the CAC policy triggers a reroute.
Start at the next slide to show the sequence of the call. This slide shows all the steps in the process on one slide because that is what the student sees in their manual. Students can follow along by referring to the steps in their manual. 3 1 2 4 5a 5b 5c

15. 1 of 5 1 20337B 7: Skype for Business Server 2015 and Networking
Start at this slide and walk students through the process.
Alice initiates a call to Bob.
Go to the next slide. 1

16. 2 of 5 1 2 20337B 7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Go to the next slide. 1 2

17. 3 of 5 3 1 2 20337B 7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Bob’s Skype for Business 2015 client checks the CAC policy to determine whether the call can be established.
Go to the next slide. 1 2 3

18. 4 of 5 3 1 2 4 20337B 7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Bob’s Skype for Business 2015 client checks the CAC policy to determine whether the call can be established.
The call is not allowed to be established over the WAN.
Go to the next slide. 3 1 2 4

19. 20337B
5 of 5
7: Skype for Business Server 2015 and Networking
Alice initiates a call to Bob.
Bob’s Skype for Business 2015 client receives a call notification.
Bob’s Skype for Business 2015 client checks the CAC policy to determine whether the call can be established.
The call is not allowed to be established over the WAN.
5a. The call cannot be routed over the Internet.
5b. The call is rerouted to the PSTN.
5c. The call audio flows across the PSTN. 3 1 2 4 5a 5b 5c

20. Media Endpoint Requirements
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Media Endpoint Requirements
7: Skype for Business Server 2015 and Networking
CAC bandwidth policy check is performed by called endpoint.
Call to legacy client will ignore CAC:
Will always be established
Bandwidth will not be managed

21. Synthetic Transactions
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Synthetic Transactions
07: Understanding Network Controls and Solutions
In Microsoft Skype for Business Server 2015, synthetic transactions provide rich logging that records:
The time that the activity started
The time that the activity finished
The action that was performed
Informational, verbose, warning, or error messages generated when the activity ran
SIP registration messages
Exception records or diagnostic codes generated when the activity ran
The net result of running the activity
Examples of actions that were performed include creating, joining, or leaving a conference, signing on to Skype for Business Server, sending an instant message, and so on.

22. Skype for Business Centralized Logging Service
07: Understanding Network Controls and Solutions
Centralized Logging Service Agent
   ClsAgent runs on every machine with Skype for Business Server deployed. It listens ( on ports TCP ) for commands from ClsController over WCF and sends responses back to the controller. It manages log sessions (start/stop/update), and searches logs. It also performs housekeeping operations like log archiving and purges.
Centralized Logging Service Controller Cmdlets  
The Skype for Business Server Management Shell sends Start, Stop, Flush, and Search commands to the ClsAgent. When search commands are sent, the resulting logs are returned to the ClsControllerLib.dll and aggregated. The controller sends commands to the agent, receives the status of those commands and manages the search log file data as it is returned from all agents on any computer in the search scope, and aggregates the log data into a meaningful and ordered output set. The information in the following topics is focused on using the Skype for Business Server Management Shell.
Skype for Business 2015 — Centralized Logging Service (CLS):
Start/Stop and Flush trace logging on all servers in a deployment from one place

23. Centralized Logging Service
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Centralized Logging Service
07: Understanding Network Controls and Solutions
CLSController FE
CLSAgent
Start, Stop, Search commands
Start, Stop, Search commands
Search results FE
CLSAgent
CLS Agent:
Runs on every Skype for Business Server
Controlled by CLS Controller
Manages log files
CLS Controller:
Controls the agents (Start, Stop, Flush)
Aggregates search results from all agents
Available on every Skype for Business Server
Managed through Skype for Business Server Management Shell
Search results
Start, Stop, Search commands FE
CLSAgent
Search results

24. Other Troubleshooting and Diagnostics Tools
07: Understanding Network Controls and Solutions
These include:
Skype for Business Network Monitor with Skype for Business Parsers
Remote Connectivity Analyzer
Snooper
Event logging (CAPI2)
Nslookup/Telnet
Testing UDP
Lync Connectivity Analyzer

25. Analyzing Your Network Assessment Results
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Analyzing Your Network Assessment Results
08: Making Recommendations for Network Readiness
Present and future considerations
Present
Future
Issue
Existing issues facing today
Planned upgrades
Findings
Location and type of issues across the enterprise network
Consider the issues in usage modeling
Highlight the issues as risks
Identify sites with future and parallel upgrade plans
Saturated links
Highlight the network upgrades as potential risk
The table on the slide covers considerations to make when analyzing the data. Both present and future issues should be considered.

26. Analyzing the Modeling Phase Results
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Analyzing the Modeling Phase Results
08: Making Recommendations for Network Readiness
Graphical results:
Focus on Skype for Business RTC bandwidth requirements and availability:
Helps to quickly identify which sites might be lacking bandwidth for Skype for Business RTC traffic
Useful for creating executive-level reports in a network assessment final report
You can choose which site results to graph

27. It Is About Interpretation
08: Making Recommendations for Network Readiness
When analyzing feedback from the data:
Look for the unexpected
Flat graphs = Good results
0.5% average packet loss on a managed line is optimal quality, but it should be flagged
Familiarize yourself with the customer’s network before starting to analyze it:
Example: 300ms delay between the US and India is bad according to the graphical results, but it is to be expected

28. Guidelines for Analysis
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Guidelines for Analysis
08: Making Recommendations for Network Readiness
These include:
The greater the distance between locations, the higher the delay
Review line characteristics:
On a managed line, packet loss and high jitter should not occur
Try to group results:
If site A to site B, and site A to site C show issues, but site B to site C does not, focus on site A
When in doubt, verify

29. Developing Recommendations
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Developing Recommendations
08: Making Recommendations for Network Readiness
How to make recommendations:
Analysis + Context/Discovery = Recommendations
Overlay simulation data with discovery data
Do not wait until the end of the simulation to discuss data
Remember – the goal is not to solve, but identify
Offer the students some example recommendations. Use the slide to guide the examples, or offer some anecdotes that coincide with the topic content.

30. Creating Reports and Documents
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Creating Reports and Documents
08: Making Recommendations for Network Readiness
Include the following:
Present a summary of your results
Document what you learned that influenced the engagement in each phase:
Discovery
Modeling
Simulation
What risks did you uncover that the customer should consider?
Create a slide for each site that you tested

31. Information to Summarize
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Information to Summarize
08: Making Recommendations for Network Readiness
Include the following:
List of locations, sites, and the number of users
List of defined personas
Completed bandwidth calculations
Documented historical data (WAN metrics)
QoS policies completed
Traffic simulation completed