A use-case based analysis of network managment functions in the ONF SDN model
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A use-case based analysis of network managment functions in the ONF SDN model Alisa Devlic (Ericsson Research) Wolfgang John (Ericsson Research) Pontus Sköldström (Acreo) Funded by the EU FP7 project SPARC. Agenda. Background and motivation Status of network management in SDN (briefly)

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A use-case based analysis of network managment functions in the ONF SDN modelAlisa Devlic (Ericsson Research)Wolfgang John (Ericsson Research)Pontus Sköldström (Acreo)Funded by the EU FP7 project SPARC


Agenda
Agenda the ONF SDN model

Background and motivation

Status of network management in SDN (briefly)

Use case: virtualized carrier-grade network

Step-by-step configuration procedures of virtualized SDN on top of physical infrastructure

Derived extensions to ONF models and protocols

Conclusions

EWSDN, 2012-10-26

NM functions for SDN

2


Introduction
Introduction the ONF SDN model

Service management

Quality of Service

Reliability

Scalability

Standardized services

Carrier-grade requirements

EWSDN, 2012-10-26

NM functions for SDN

3


Sparc project and use case
SPARC project and use case the ONF SDN model

Prime use-case:

access & aggregation networks

  • SPARC: Split Architecture for carrier-grade networks

    • Applying SDN to the operator domain

    • Important requirement: Network and service management capabilities

  • Purpose of this paper

    • Analyze the ONF model by applying it on a virtualized carrier network shared by multiple tenants

    • Network Configuration, as well as Fault and Performance management with a focus on automated processes

EWSDN, 2012-10-26

NM functions for SDN

4


Onf config mgmt wg
ONF config&mgmt WG the ONF SDN model

  • Output so far: Specification for OF-config 1.0 and 1.1(.1)

    • OF-config: an OpenFlow configuration protocol

    • defining a schema to ensure there is a consistent representation of configuration elements

    • XML and Yang models, transport via NetConf

    • OF-config 1.0 functionalities:

      • Controller assignment; Configuration of queues and ports; Changing some aspects of ports (e.g. up/down)

    • OF-config 1.1(.1) functionalities:

      • Certificate handling; Capability discovery; Basic tunnel configuration (vxlan, nvgre, ip-gre)

EWSDN, 2012-10-26

NM functions for SDN

5


Status of network management in sdn
Status of Network Management in SDN the ONF SDN model

Apps

NB API

Controller

Network OS (NOS)

OF-CP

OpenFlow

OF-Config

Resources(ports, queues)

Resources(ports, queues)

OF logical switch

OF logical switch

OpenFlow Capable switch

  • Current SDN architecture by the ONF

    • OpenFlow Capable Switch

      • Physical network element

      • Managed via OF-config by OF-CP

    • OpenFlow Logical Switch

      • Hosted within a capable switch

      • Controlled via OpenFlow by OF Controller(s)

    • Network Applications (Apps)

      • Use the network via the controllers northbound API

    • Relationship between controller and OF-CP

      • Deliberately NOT defined by the ONF

      • We consider both to be part of the NOS

EWSDN, 2012-10-26

NM functions for SDN

6


Virtualized carrier grade network
Virtualized carrier-grade network the ONF SDN model

  • Sharing physical infrastructure among virtual network operators (VNO)

    • Network owner manages physical network and creates virtual networks

    • VNOs manage their virtual network

    • Allows offering different levels of abstractions to VNOs, virtualization on top of physical infrastructure [9]

EWSDN, 2012-10-26

NM functions for SDN

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Required configuration procedures 1
Required configuration procedures (1) the ONF SDN model

  • Device configuration and network bootstrapping

    1a) Address (auto)configuration

    • Addresses of switch itself, OF-CP, and authentication (AA) service

    • Optional: protocol, port numbers

    • Example: DHCP

      1b) Authentication and authorization

    • Establishing initial trust with AA

    • Certificate exchange

      1c) Establishing OF-config session

    • Using obtained addresses and certificates

  • OF session with OF controller are not

    established before a logical switch is instantiated (2b)

EWSDN, 2012-10-26

NM functions for SDN

8


Required configuration procedures 11
Required configuration procedures (1) the ONF SDN model

Physical network configuration

  • Discovery of physical resources, HW, and SW capabilities - OF-Conf session

  • Instantiate and connect master logical switch (with access to all physical ports) to master controller

    • OF-CP assigns connection identifiers and credentials to master controller

    • result: established OF session

  • Discovery of the physical topology

    • controller-based (pure OF switches) – centralized LLDP (NOX)

    • cistributed manner (hybrid switches) – LLDP or STP

    • discovered topology shared with OF-CP

EWSDN, 2012-10-26

NM functions for SDN

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Required configuration procedures 2
Required configuration procedures (2) the ONF SDN model

Virtual network configuration

  • Configure fault and performance monitoring

    • for physical links and switch resources

  • Virtual network setup

    • compute virtual topologies, create virtual links, instantiate logical switches for virtual network, validate

  • Virtual network operation

    • Handing over to a customer

EWSDN, 2012-10-26

NM functions for SDN

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Derived extensions 1
Derived Extensions (1) the ONF SDN model

  • Bootstrapping considerations

    • automatic bootstrapping requires mechanisms for control network setup, address assignment, authentication, and transfer of credentials

  • SDN architecture and NOS model

    • Need to share data between controller and OF-CP

    • Need to connect multiple OF-CPs with different views and capabilities

      • Full view for network owner (master)

      • Reduced view for VNOs

  • Extensions to OF-Config and OF protocol

EWSDN, 2012-10-26

NM functions for SDN

11


Derived extensions 2
Derived Extensions (2) the ONF SDN model

  • Protocol and data model requirements

  • To OF-config

    • Physical resource discovery

    • Logical link configuration

    • Logical switch instantiation

    • Device and link OAM config

  • To OpenFlow or OF-mon

    • Alarm and notification propagation

    • Currently under discussion in ONF

EWSDN, 2012-10-26

NM functions for SDN

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Conclusions
Conclusions the ONF SDN model

  • Purpose

    • Verify the applicability and usefulness of the ONF SDN model in terms of NM

      • The use case of a virtualized carrier network shared by multiple customers (VNOs)

    • We outline the steps required to configure and manage this type of virtualized SDN

      • we identified shortcomings and proposed necessary extensions to ONF SDN model in terms of NM

    • Provide pointers for the ONF config-mgmt WG

    • The highlighted extensions include: control network bootstrapping considerations, updates to the SDN and NOS model, and extensions to the OF-Config management data model.

    • We are active in contributing to ONF config & management WG

      • Bootstrapping, topology discovery, event framework, path monitoring

EWSDN, 2012-10-26

NM functions for SDN

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