UC SDN Use Case Chris Lauwers - Ubicity Corp.

1. UC SDN Use Case
Chris Lauwers—Ubicity Corp.

2. •SDN Explained in Two Minutes
•Why Should We Care?
•SDN Opportunities for Unified Communications
•UC SDN Use Cases
–Automating QoE
–Diagnostics
–Orchestration
•Automating QoE
–Dynamic QoS Marking
–Admission Control
–Dynamic Traffic Engineering
Agenda

3. SDN EXPLAINED IN 2 MINUTES

4. •Software Defined Networking is:
–The physical separation of the network control plane from the forwarding plane
–Where a control plane controls several devices.
Definition from Open Networking Foundation (ONF)
Forwarding
Control
Forwarding
Control
Forwarding
Control
Forwarding
Control
Forwarding
Control

5. •Software Defined Networking is:
–The physical separation of the network control plane from the forwarding plane
–Where a control plane controls several devices.
Definition from Open Networking Foundation (ONF)
Forwarding
Forwarding
Forwarding
Forwarding
Forwarding
Logically Centralized Control Plane

6. •Controller-Based Network Architecture
SDN Architecture
SDN North-Bound Interface
Network Controller
Topology
Network
Element
SDN Protocols
SDN Applications
Inventory
Path Calculation
Flow Programming
Statistics
SDN Applications
Network
Element
Network
Element
Network
Element

7. WHY SHOULD WE CARE?

8. SDN Benefits for End-User Applications
•End-user application programmers have surprisingly little control over the network
–Limited to “connect my port to some endpoint”
•Application programmers have surprisingly little visibility into the network
–Limited to connectivity failures
•Available abstractions limited to connectivity
Connectivity
Connections
Addresses
Protocols
Ports
Interfaces
Network
Element

9. NBIs Provide End-to-End Network Abstractions
Topology
Network Element
SDN Protocols
Inventory
Path Calculation
Flow Programming
Statistics
Network
Element
Network
Element
Network Element
Performance
Packet Loss
Jitter
Delay
Topology
Paths
Proximity
Distance
Location
Network Graph
Status
Utilization
Congestion
Path Status
Link Status
Trends
Error Rates
Peak Load
Usage
Connectivity
Connections
Addresses
Protocols
Interfaces
Ports
Bandwidth

10. SDN OPPORTUNITIES FOR UC

11. It’s the Network, Stupid
•60% to 80% of Quality of Experience (QoE) problems are caused by issues with the underlying network
–Improper QoS configuration
–Wireless access point issues
–Interfaces between networks
•Limited troubleshooting support
–Because of lack of network visibility
•No options for corrective actions
–Aside from error concealment

12. Allow UC Applications to Communicate with SDN Controllers to:
Explicitly identify voice, video, and other UC traffic
Versus:
•Using dedicated voice VLAN
•Network-based application recognition
Explicitly requesting QoS treatment for UC traffic on a session-by-session basis
Versus “one-size-fits-all” static QoS markings
Preventing network overload through centralized admission control
Versus per-application call admission control
Resolving situations where insufficient bandwidth is available
Versus ???
SDN Opportunity: Closing the Loop between Network and UC

13. Automated QoE Service
Automated QoE API
Network Controller
Topology
Network
Element
SDN Protocols
UC&C Application
Inventory
Path Calculation
Flow Programming
Statistics
UC&C Application
Network
Element
Network Element
Network
Element
Automated
QoE Service
Dynamic QoS Marking
Admission Control
Dynamic Traffic Engineering
Policy
Administrator
Interface

14. UC SDN USE CASES

15. Automated QoE Service Deployment Options
QoS Marking
Admission Control
Traffic Engineering
Option 2
Policy
Policy
Admission Control
QoS Marking
Option 1
QoS Marking
Policy
Mandatory

16. DYNAMIC QOS MARKING

17. Dynamic QoS Marking: Example
Configuration
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
UC&C
Infrastructure

18. UC&C Startup: Install Static QoS
Policy for Signaling Traffic
Access
Switch
Automated QoE Service
Access
Switch
Create Policy AP Wi-Fi
UC&C
Infrastructure

19. UC&C Startup: Install Static QoS
Policy for Signaling Traffic
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
Set Static QoS
Policies
UC&C
Infrastructure

20. Call Setup—Signaling Traffic
Receives QoS Treatment
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
BE
CS3 CS3 CS3 CS3 CS3
BE
CS3
CS3
CS3
CS3
UC&C
Infrastructure

21. Call Setup—UC&C Requests QoS
Treatment for Session Media
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
BE
CS3 CS3 CS3 CS3 CS3
BE
CS3
CS3
CS3
CS3
UC&C
Infrastructure
Create Session

22. Call Setup—UC&C Requests QoS
Treatment for Session Media
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
BE
CS3 CS3 CS3 CS3 CS3
BE
CS3
CS3
CS3
CS3
UC&C
Infrastructure
Create Session
BE
BE BE
BE
BE
BE

23. Call Setup—UC&C Requests QoS
Treatment for Session Media
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
UC&C
Infrastructure
BE
BE BE
BE
BE
BE
Set Session QoS
Policies

24. Call Setup—UC&C Requests QoS
Treatment for Session Media
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
UC&C
Infrastructure
BE
EF EF
EF
EF
BE
Set Session QoS
Policies
EF
EF

25. UC&C QoS is Secured
Access
Switch
Automated QoE Service
Access
Switch
AP Wi-Fi
UC&C
Infrastructure
BE
EF EF
EF
EF
BE
EF
EF

26. Automated QoE API
•Session-Based Model
–Dynamic
–Used for media traffic
•Operations
session_start(session)
session_read(session)
session_update(session)
session_end (session)
session_changed(session, reason)
•Policy-Based Model
–Static
–Used for signaling
•Operations
policy_add(policy)
policy_read(policy)
policy_update(policy)
policy_delete(policy)
26

27. Automated QoE Information Model
Session Element
Start Time
Description
Group ID
Media
Media
User
Media
° ° °
Session ID
User Element
User ID
User Name
Realm
Media Element
Flow
Description
QoS Requested
Age-Out Timer
QoS Granted
User ID
Flow Element
Source IP Address
IP Address Type
Dest IP Address
Transport
Dest IP Port
Source IP Port
QoS Requested
Average Bandwidth
Application Class
Max. Bandwidth
Min. Bandwidth
QoS Granted
Granted Bandwidth
Actual Class
DSCP

28. Dynamic QoS Marking—Control Flow
Parse Session
For Each Media Element
Map Granted CoS to QoS Markings
QoS Setup Complete
QoS Mapping
Apply QoS Markings at Network Ingress
Parse Requested CoS for Media Element
Determine Granted CoS
QoS Policy

29. Dynamic QoS Marking—Policy Decisions
•Define available Classes of Service
•Map Classes of Service to QoS markings
•Control access to Classes of Service
Parse Session
For Each Media Element
Map Granted CoS to QoS Markings
QoS Setup Complete
QoS Mapping
Apply QoS Markings at Network Ingress
Parse Requested CoS for Media Element
Determine Granted CoS
QoS Policy

30. ADMISSION CONTROL

31. Admission Control—Control Flow
•Centralized
–As opposed to per- application
–Accounts for all traffic
•Accurate topology model
–As opposed to administrator- configured
Parse Session
For Each Media Element
Determine Granted CoS and Bandwidth
Dynamic QoS Marking
Admission Control Policy
Calculate Path
Parse Requested CoS and Bandwidth
No
Sufficient BW in CoS
Reject Call
Yes

32. •What action to take when insufficient bandwidth in requested Class of Service:
–Grant less than requested
–Re-allocate bandwidth by reducing bandwidth for “lower-priority” sessions
–Relegate flow to “lower” Class of Service
–Relegate flow to Best Efforts
–Reject call
Admission Control—Policy

33. DYNAMIC TRAFFIC ENGINEERING

34. Dynamic Traffic Engineering— Control Flow
•TE of CoS Bandwidth
•TE of Media Paths
No
Yes
Determine Granted CoS and BW
Sufficient BW in CoS
For Each Media Element
Parse Session
Parse Requested CoS and BW
Admission Control Policy
Calculate Path
No Call Resources
CoS BW Increased?
Alternate Path?
Yes
No
Dynamic CoS Traffic Engineering
Traffic Engineering Policy
No
Yes
Dynamic Path Traffic Engineering
Dynamic QoS Marking