SDN Solution for Service Provider Access Network
Dennis Pai, Product Manager
Ahmed Abeer, Technical Marketing Engineer
BRKSPG-2064
• Overview and Business Drivers
• SDN Technologies and Protocols
• SDN Products and Solution
• Example Use Cases
• SDN Application Demo
• Summary and Conclusion
Agenda
3
Scope of Discussion
• Focus on SDN technologies and solutions in the context of Service Provider IP networks
• Data Center and Enterprise related technologies will not be discussed
• See Related Sessions for more detailed information on these Cisco solutions
Session Objective
Explore SDN Use Cases
Understand Key Benefits
Learn about SDN Technology
Overview and Business Drivers
6
Software Defined Networking
Applications
Control Plane
Data Plane
Virtual
Physical
• Decoupled Control and Data Planes
• Highly Centralized Control (aka SDN Controller)
• Greater application interaction with the network
• An opportunity to re-think the relationship between network hardware and software
SDN Definition (ONF): The physical separation of the
network control plane from the forwarding plane, and
where a control plane controls several devices.
Network Functions Virtualization
Purpose built appliances Servers!
VNFs
• Transition of network services to run on virtualized compute infrastructure
• Decoupling the service from the device
• Elastic, consumption-based service model
Network Programmability
Physical and Virtual Network Infrastructure
Model Drivern Programmable Interfaces
Programmatic
Interfaces
Open
Protocols
Configuration
Management
Traffic
Engineering
Operational
State
Service Provider Market Trends
Changing Customer Expectations
The World Has Gone Mobile Massive Traffic Growth, Driven by Video
Soon to Change SP Architectures/
Service Delivery
Emergence of the Internet of Everything
Process ThingsPeople Data
Ubiquitous Access
to Apps & Services
Changing Enterprise
Business Models
Efficiency & Capacity
Rise of Cloud Computing M2M Driving Enterprise Business Value
+ + +
10X Mobile Traffic Growth
From 2013-2019
OPEX Reduction is Key to Contain Cost
$300 $313 $316 $315 $304
$1,331 $1,341 $1,299 $1,321 $1,282
2011 2012 2013 2014 2015
Worldwide Service Provider CAPEX vs OPEX ($B)
Capex Opex
Infonetics Service Provider Capex, Opex, Revenue, and Subscribers, Oct 2015
Cisco SP Routing Platforms
DCISP Data Center
NCS6KASR9K
nV, AN, MPLS,
EthernetMPLS
(SR, LDP, BGP, mLDP, nV) CoreMPLS (SR, SRTE, mLDP, BGP)
AccessCE/NID Preggregation
InternetMPLS
(SR, LDP, BGP, mLDP)
ASR900ASR9K
ASR9000v
ASR920
ASR920-12SZ-IM
Aggregation
ASR9K
ASR900
Service Edge
ASR9K
Internet
Gateway
ME1200
NCS5500
NCS5000
NCS5000NCS5000
NCS5500
NCS5500
CRS
Access Network
Access Network Characteristics
Simple DevicesHeterogeneous/Multi-
Vendor Environment
Special Device
Requirements
Right-size
Purchase
Long Installation and
Setup Time
Service
Orchestration
SDN
Interfaces
Packet
Transport
Services MEF Services Mobile Infrastructure Business VPNResidential
Services
CLI,
SNMPNETCONF/YANG BGP Openstack/vCenter PCEP
ME1200
ASR907/903
ASR920
ASR9000v
NCS5500
NCS5000
ASR9K
NCS6K
XRv-9000
CSR1Kv
Physical VirtualApplication Engineered Routing AER Routing, AER-TE, AER-LDP Interworking, BGP LU
Orchestration, Service and Policy Implementation
(NSO enabled by Tail-f)
Multi Layer Manager
(EPN-M)DC & NFV Controller
(ESC, VTS, APIC)Open Source Controller
(OSC, ODL)
Multilayer WAN
Automation Engine
(WAE, AER)
Multi Vendor End to End Management & Orchestration (Physical & Virtual)
Cloud PolicerApplications Rapid Service Deployment
Service-Intent API
SDN / APIs
Bandwidth on Demand
& Calendaring
Optical
Transport Optical
IPoDWDM
Intelligent Traffic Steering
& Virtual Patch Panel
Cisco SDN Strategy for SPs – Evolved Programmable Networks (EPN)
SDN Technologies and Protocols
15
Cisco SDN Strategy for SPs – Evolved Programmable Networks (EPN)
Service
Orchestration
SDN
Interfaces
Packet
Transport
Services MEF Services Mobile Infrastructure Business VPNResidential
Services
CLI,
SNMPNETCONF/YANG BGP Openstack/vCenter PCEP
ME1200
ASR907/903
ASR920
ASR9000v
NCS5500
NCS5000
ASR9K
NCS6K
XRv-9000
CSR1Kv
Physical VirtualApplication Engineered Routing AER Routing, AER-TE, AER-LDP Interworking, BGP LU
Orchestration, Service and Policy Implementation
(NSO enabled by Tail-f)
Multi Layer Manager
(EPN-M)DC & NFV Controller
(ESC, VTS, APIC)Open Source Controller
(OSC, ODL)
Multilayer WAN
Automation Engine
(WAE, AER)
Multi Vendor End to End Management & Orchestration (Physical & Virtual)
Cloud PolicerApplications Rapid Service Deployment
Service-Intent API
SDN / APIs
Bandwidth on Demand
& Calendaring
Optical
Transport Optical
IPoDWDM
Intelligent Traffic Steering
& Virtual Patch Panel
etc
MPLS
BGP
NETCONF (or REST), YANG, and Open ConfigTaking Service Automation to the next level: Declarative Configuration and Model-Driven Management
NETCONF (or REST)
Yang
Models
YANG Modules
YANGModulesManagement
Applications
Operating System
Data Plane
Programmatic Interfaces
Control Plane / AgentYANG
Modules
YANG Modules
Network
Elements
What is OpenConfig?
“An informal working group of network operators
sharing the goal of moving our networks toward
a more dynamic, programmable
infrastructure…declarative configuration and
model-driven management and operations. The
initial focus of the effort is on the development of
vendor-neutral data models for configuration and
management that will be supported natively on
networking hardware and software platforms”
source: www.openconfig.net
Path Computation Element Protocol (PCEP)
• Used between head-end router and PCE to:
• Request/receive path from PCE subject to constraints
• State synchronization between PCE and router
• Hybrid CSPF
• Two current modes based on Stateful PCE initiative:
• PCE Initiated: App + PCE initiate tunnel setup
• LSP Delegation: router initiates tunnel setup (e.g. via CLI or NMS) then delegates tunnel management to PCE
4 5
3
6 7
AS2
2
1AS1
PCE
PCEP
• Allows BGP to push IGP topology (LSDB) and resource utilization up to central SDN controller
• New link state address family
• BGP provides a familiar operational model to aggregate topology information across domains
• Multi-hop sessions
• Need at minimum single BGP-LS speaker per domain
• Topology information distributed from IGP into BGP (only if changed)
Domain 1 Domain 2
Domain 0
BGP-LS
BGP-LS BGP-LS
RR
BGP Link State (BGP-LS)
SDNControl
• Base specification defined in IETF RFC 5575
• Various extensions defined in other IETF documents (see IDR working group docs)
• Provides the following key capabilities:
1. Distribute ACLs via BGP, thereby, enabling rapid inter-domain distribution of flow-based traffic filters at large-scale (network wide)
2. Flow-based traffic redirection, for example, to traffic scrubber for DDoS mitigation
• Open Daylight Lithium release will support origination of BGP Flowspec rules
• Recent Cisco contribution
• Enables centralized policy engine to dynamically program network wide traffic filtering and steering policies via Open Daylight SDN controller REST interface
• Facilitates SDN-based DDoS mitigation
BGP Flow Specification (aka Flowspec)
• IP/MPLS architecture that seeks the right balance between distributed intelligence and centralized optimization and programming
• Drastic reduction of control-plane and hardware state
• Better utilization of the installed infrastructure
• Wide applicability: DC, WAN, Metro, Peering (end-to-end)
• An architecture designed with SDN in mind
• Unleash application-network innovation
• Open IETF proposed standard (SPRING working group)
Segment Routing
www.segment-routing.net
21
Segment Identifiers
Segment Routing Overview
C -> D -> E C -> D -> B ->E C -> D -> B ->E
SDN Products and Solutions
24
Cisco SDN Strategy for SPs – Evolved Programmable Networks (EPN)
Service
Orchestration
SDN
Interfaces
Packet
Transport
Services MEF Services Mobile Infrastructure Business VPNResidential
Services
CLI,
SNMPNETCONF/YANG BGP Openstack/vCenter PCEP
ME1200
ASR907/903
ASR920
ASR9000v
NCS5500
NCS5000
ASR9K
NCS6K
XRv-9000
CSR1Kv
Physical VirtualApplication Engineered Routing AER Routing, AER-TE, AER-LDP Interworking, BGP LU
Orchestration, Service and Policy Implementation
(NSO enabled by Tail-f)
Multi Layer Manager
(EPN-M)DC & NFV Controller
(ESC, VTS, APIC)Open Source Controller
(OSC, ODL)
Multilayer WAN
Automation Engine
(WAE, AER)
Multi Vendor End to End Management & Orchestration (Physical & Virtual)
Cloud PolicerApplications Rapid Service Deployment
Service-Intent API
SDN / APIs
Bandwidth on Demand
& Calendaring
Optical
Transport Optical
IPoDWDM
Intelligent Traffic Steering
& Virtual Patch Panel
Network Services Orchestrator (NSO)
• Enabled by tail-f
• Multi-vendor service orchestrator for existing and future networks o Includes distributed (multi-device) service
configuration management, transaction integrity, validation and rollback
• Single pane of glass for:o L2-L7 networking
o Hardware Devices
o Virtual Appliances
• YANG Model Driven Orchestration
o Service Data models (declarative)
o Device Data Model (for auto config)
o Fastmap engine translates models to device configuration including CLI
• Highly Scalable for large infrastructure
o One of the existing deployment is managing 60K devices on the network
Network Element Drivers
Device Manager
Service Manager
Network Services Orchestrator (NSO) Service
Models
Device
Models
Network-wide CLI, Web UIREST, Java, NETCONF
Network
Engineer
Management
Applications
End-to-End
Transactions
NETCONF, CLI, SNMP, REST, etc.
• Applications
• Controllers
26
Cisco’s Open SDN ControllerCisco’s Commercial Edition Of Open Daylight
“One-Click” Install
VMware ESXi and Oracle
Virtual Box hypervisor ready Pre-Installed Apps
•BGPLS Manager – visualizes
network topology from BGP database
• Inventory – augmented
OpenDaylight “Nodes” app
identifies all connected devices
•(YANG) Model Explorer – exposes
system models and previews JSON
API body
•OpenFlow Manager – manages,
visualizes and troubleshoots flows +
previews JSON API body
•PCEP Manager – creates, modifies
and deletes MPLS LSPs
Centralized OA&M
Robust user, application and
feature administration
Status monitoring: system,
cluster, node
Event logging
Real-time CPU, memory,
disk, heap size, load and
network utilization metrics
See also: http://www.cisco.com/c/en/us/products/cloud-systems-management/open-sdn-controller/index.html
27
• Multi-Application Engine for the SP WAN
• Enables applications to make queries about placing demands
• Run demand placement and network failure simulations
• Request demand placement or optimization on the network
• WAE is really an advanced suite of network optimization, planning and calendaring capabilities which can be leveraged by applications
• Capabilities exposed via northbound REST/Java/Thrift APIs
• WAE uses topology and traffic abstraction
• By collecting information from the network
• Multi-Vendor platform
• Compliments NSO and Open SDN Controller (ODL)
WAE: WAN Automation Engine
http://www.cisco.com/go/wae
Sourc
eDestination
SDN Orchestration & ControlConfiglet NSO EMS/NMSODL/OSC …
Traffic Management Applications
REST
REST/NETCONF
NETCONF/PCEP/BGP-LS
Example Use Cases
29
1. Service Automation
2. Automated Traffic Engineering
3. Bandwidth on Demand / Calendaring
4. DDoS Mitigation
5. Agile Carrier Ethernet
Example Use Cases
Access
Backbone
Metro
DC
Use Case #1 – Service Automation (1/2)End-to-End Service Provisioning Across Multi-Vendor Network
Homegrown
Inventory DB
PortalPartner API
NETCONF/YANG
CLI
REST
NSO
1. Customer adding new site to L3VPN
2. Portal or Partner REST API call to Tail-F NCS with new service parameters
3. NCS performs customer lookup and calls L3VPN service model
4. Service model contains multi-device logic which includes provisioning of backhaul circuit(s) and PE configuration
5. Service model parameters are mapped to the appropriate NCS Network Element Driver (NED) for each device in the service topology
6. NCS’ NED pushes configuration to devices via CLI or NETCONF/YANG
Customer_L3VPNManagement Plane
Control Plane
Host OS
Data Plane
Access
Backbone
Metro
DC
Use Case #1 – Service Automation (2/2)End-to-End Service Provisioning Across Multi-Vendor Network
Homegrown
Inventory DB
PortalPartner API
REST
Benefits
•Massive reduction in provisioning errors
•Customer self-selection (and automation)
•Developed new Flexible-VPN service offerings
•10x increase in transactions vs. previous manual process
•Scale Ops Staff: increased services-to-engineers ratio
NSO
NETCONF/YANG
CLI
Backbone
DC
Use Case #2 – Automated Traffic EngineeringImprove Capacity Management and Network Utilization
1. WAE and ODL continuously collect topology and traffic information
2. PCE application queries WAE for topology and traffic info
3. PCE application computes optimal load placement for traffic matrix
4. PCE application programs re-optimized load placement via WAE
5. WAE creates, modifies and/or deletes RSVP-TE tunnels or SR-TE paths as needed via ODL
6. Go back to step 2 and repeat → Automated Traffic EngineeringREST
PCEPBGP-LS
REST
MetroAccess
ApplicationMATE
Apps
REST
NETCONFSNMP
NETFLOW
CLI
(Real-Time)(Non-Real-Time)
TE Tunnels
WAN Automation Engine
(WAE)
Backbone
DC
Use Case #3 – Bandwidth on Demand / CalendaringNew Service and Revenue Opportunity
1. WAE and ODL continuously collect topology and traffic information
2. Customer uses SP web portal to reserve bandwidth between its sites (effective immediately or at a future date and time)
3. PCE application queries WAE to verify if traffic demand can be admitted and, if so, to identify optimal paths
4. PCE application decides load placement for traffic demand
5. PCE application admits traffic demand via WAE
6. WAE admits traffic demand onto network topology which may include creation, modification and/or deletion of RSVP-TE tunnels or SR-TE paths as needed via ODL
REST
PCEPBGP-LS
MetroAccess
Application
REST
NETCONFSNMP
NETFLOW
CLI
Portal
TE Tunnels
WAN Automation Engine
(WAE)
Backbone
DC
Use Case #4 – DDoS MitigationMitigate Security Attacks using SDN Controller
1. Network telemetry provides visibility to detect DoS attacks
2. Once detected, DDoS mitigation application programs attack mitigation policy using REST interface of Open Daylight SDN controller
3. Open Daylight SDN controller originates BGP flowspec rules to either filter attack or redirect attack traffic to scrubbing center
4. BGP flowspec rules are propagated to wider network (e.g., border routers) using BGP route reflector (physical or virtual)
5. Border routers install security policy to mitigate attack
BGP Flowspec
BGP Flowspec
MetroAccess
DDoS Mitigation Application
REST
BGP Route Reflector
Backbone SR Metro
Use Case #5 – Agile Carrier Ethernet (1/2)Extending Segment Routing into Carrier Ethernet Access Network
1. Simplify MPLS protocol stack: IGP + SR (no LDP, RSVP, etc.)
2. Eliminate Layer-2 Control Plane and scale challenges
3. IP Unnumbered links, zero-touch node insertion (Autonomic Networking)
4. Use SR Node Label for Intra-Area traffic
5. Use Service Node Label for Inter-Area Traffic
6. Link and Node protection with Topology Independent FRR (TiFRR)
IGP Segment Routing
Domain. Single IGP Area
Core / Backbone
Segment Routing or MPLS-TE
BGP-LU
IGP Segment Routing
Domain. Single IGP Area
Service Nodes
Access Nodes
Backbone SR MetroSR Metro
Use Case #5 – Agile Carrier Ethernet (2/2)Extending Segment Routing into Carrier Ethernet Access Network
Static
Label
REST
7. Service Topology Decoupled from SR Transport Topology
8. Controller (NSO + XRv) receives IGP topology data via BGP-LS advertisement
9. Controller receives Service Node Label information via BGP-LU
10. Controller provisions attachment circuit parameters (EVC, QOS), and Service Node reachability (static label + FIB entry)
11. Service Node receives inbound static PW traffic, decapsulates and places in
12. Two Provisioning Touch-Points
BGP-LS
BGP-LU
PortalPartner API
Customer_E-LINE
NSO IOS-XRv+
Static
LabelBGP-LS
BGP-LU
BGP-LU
Rapid Service Deployment (RSD) Demo
Service
Orchestration
SDN
Interfaces
Packet
Transport
Services MEF Services Mobile Infrastructure Business VPNResidential
Services
CLI,
SNMPNETCONF/YANG BGP Openstack/vCenter PCEP
ME1200
ASR907/903
ASR920
ASR9000v
NCS5500
NCS5000
ASR9K
NCS6K
XRv-9000
CSR1Kv
Physical VirtualApplication Engineered Routing AER Routing, AER-TE, AER-LDP Interworking, BGP LU
Orchestration, Service and Policy Implementation
(NSO enabled by Tail-f)
Multi Layer Manager
(EPN-M)DC & NFV Controller
(ESC, VTS, APIC)Open Source Controller
(OSC, ODL)
Multilayer WAN
Automation Engine
(WAE, AER)
Multi Vendor End to End Management & Orchestration (Physical & Virtual)
Cloud PolicerApplications Rapid Service Deployment
Service-Intent API
SDN / APIs
Bandwidth on Demand
& Calendaring
Optical
Transport Optical
IPoDWDM
Intelligent Traffic Steering
& Virtual Patch Panel
Cisco SDN Strategy for SPs – Evolved Programmable Networks (EPN)
• Introducing new access nodes and provisioning new services are costly and time consuming
• Service Provisioning is often a manual and vendor specific solution
• CLI requires expertise on user side
• NMS solutions are vendor specific
• Current processes hinder new services deployment time
SP Deployment Problem Statement
Solution: Rapid Service Deployment (RSD) ODL Application
Secure Zero Touch Device Activation• Secure Channel Discovery & Device Bootstrap (Autonomic Network)
• Automated Services Discovery (TFTP, AAA, Syslog etc.) and Configuration Download
• Virtual Out of Band Management
Open and Multi Vendor Service Provisioning• Multi-vendor Open API (NETCONF/YANG, REST) based Service Deployment
• L2VPN & L3VPN Service Provisioning
Service Validation and Performance Monitoring•Industry StandardsY.1564, RFC 2544 and Y.1731 PM based Network Performance
Management
Coexist with NMS• NMS can be used for incremental configuration, element & service management after initial
bootstrapping and configuration by RSD
Open Daylight (ODL)
Services (L2VPN/L3VPN)
ProvisioningApplication Image & Configuration
Download (CSM)
Core Edge Access
RSD High Level Block Diagram
Service & NetworkController
Physical & Virtual Devices
Performance
Management &
Topology Discovery
RESTCONF
PACKAGED
IN
ONE
APP
BGP LS Netconf/Yang Autonomic Configlets SNMP
Cisco NSO
Cost Impact
RSD Business Outcome – Reduced OpEx
After
RSD
Greater than 56%
Cost Savings
Enabling 75% Reduction in Truck Rolls
Traditional RSD
Node
Insertion
$625 -
$1500
$275
RSD Demo
SR + WAE Demo
• In this demonstration you will experience the following:
• Cisco WAE acting as Controller of an MPLS Segment Routing network built with ASR 9000 and XRv devices
• Programmatic access to Cisco WAE requesting instantiation of traffic engineering policies in the network
• PCE-initiated Segment Routing Traffic Engineering (SR-TE) policies
• Automatic re-optimization of existing paths triggered by network topology changes
Demonstration Objectives
P1
PE1
P2
PE2CE1
CE2
Demo Components
WAEAPP
PCEP BGP-LS
REST APIs
IS-IS Segment Routing
IP / MPLS network BGP-LS = BGP Link State
PCEP = Path Computation Element Protocol
WAN Controller
P1
PE1
P2
PE2CE1
CE2
Initial State
Lo0
SID 16041
Lo0
SID 16141
Lo0
SID 16142
Lo0
SID 16042
10
100
10
10
10
10
10
10
5
1005
30
5
20
0Using MPLS labels propagated via SR ISIS extensions,
traffic CE1-CE2 travels over LSP following IGP best path
IGP metric = RED
TE metric = BLUE
16042
IP
IPIP
IP
POP (PHP)
P1
PE1
P2
PE2CE1
CE2
Lo0
SID 16142
Lo0
SID 16042
APP RequestWAEAPP
10
100
10
10
10
10
10
10
5
1005
30
5
20
16142
16042
1REST API
APP requests PATH PE1-PE2 with latency < 45 msec;
or otherwise lowest possible when out-of-contract
IPIP
16142
16042
IPIP
POP (PHP) IGP metric = RED
TE metric = BLUE
2 WAE computes path meeting constraints
Path found !!!
In-contract == cumulative TE metric = 20
3WAE deploys path onto the network using PCEP
Forwarding instructions in SR ERO:
Follow IGP path to P2
then follow IGP path to PE2
POP (PHP)
4WAE replies to APP
Path found – in-contract
1
4
P1
PE1
P2
PE2CE1
CE2
Lo0
SID 16142
Lo0
SID 16042
Link Failure A (1/2)WAEAPP
10
100
10
10
10
10
5
1005
30
5
20
6Network self-heals in less than 50-msec
via IP Fast Reroute (TI-LFA)
Optimal backup path
IGP re-converges
No controller involvement !!!
IPIP
IGP metric = RED
TE metric = BLUE
TI-LFA = Topology Independent Loop Free Alternate
IP
POP (PHP)
16142
16042
IP
POP (PHP)
16042
IP
5 Link Fails
7BGP-LS update
sent to WAE
P1
PE1
P2
PE2CE1
CE2
Lo0
SID 16142
Lo0
SID 16042
Link Failure A (2/2)WAEAPP
10
100
10
10
10
10
5
1005
30
5
20
IPIP
IGP metric = RED
TE metric = BLUE
Adj SID = Adjacency SID
16142
24001
16042
IP
POP (PHP)
8WAE reacts to topology changes
Re-optimizes path in the network
Path found !!!
In-contract == cumulative TE metric = 40
No need to communicate to APP !!!
16142
24000
16042
9 WAE deploys new path onto the network
Forwarding instructions in SR ERO:
Follow IGP path to P2
then follow low TE metric link P2-P1
then follow IGP path to PE2
Adj SID
24001
P1
PE1
P2
PE2CE1
CE2
Lo0
SID 16142
Link Failure BWAEAPP
10
100
10
10
10
10
5
1005
30
5
20
IPIP
IGP metric = RED
TE metric = BLUE
TI-LFA = Topology Independent Loop Free Alternate
24003
16042
IP
POP (PHP)
11WAE reacts to topology changes
Re-optimizes path in the network
Path found !!!
Out-of-contract == cumulative TE metric = 50
24001
16042
12 WAE deploys new path onto the network
Forwarding instructions in SR-ERO:
Follow low TE metric link PE1-P1
then follow IGP path to PE2
10 Second link fails
13
Adj SID
24003
13WAE replies to APP
Path found – out-off-contract
Additional Information
53
• BRKSDN-1119 – Hitchhiker's Guide to Device APIs
• BRKNMS-2032 - YANG Data Modeling and NETFCONF: Cisco and Industry Developments
• BRKGEN-2999 - Autonomic Networking
• BRKSPG-4006 - Next Generation Programmable SP/Web/OTT Routing Infrastructure for Core, Edge and DCI
Related Sessions
• LTRSDN-1913 - Cisco Open SDN Controller Hands-on Lab
• LTRSPG-2516 - Evolved Programmable Networks: Design and Orchestration
• DevNet-1081 - Introduction to RESTCONF
• DevNet-1082 - Introduction to Data Models and Cisco's NextGen Device Level APIs
• DevNet-1177 - Network programming using Yang service models with Cisco Network Services Orchestrator
• DevNet-1083 - Introduction to YANG Data Models and Their Use in OpenDaylight
Related Sessions
Summary
Apply SDN technologies today from
core to access
Leverage Cisco SDN solutions to help
simplify network operations
Write your own SDN application now!
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59