ntt’s use-cases and plans for stratum•flexible service function chaining •auto...

Copyright©2018 NTT corp. All Rights Reserved.

NTT’s Use-cases and Plans for Stratum

April 19th-20th, 2018 NTT Network Service Systems Labs.

Satoshi Nishiyama

2 Copyright©2018 NTT corp. All Rights Reserved.

NTT Group

NTT East

NTT West

NTT

Communications

NTT DATA

Other

group

companies

Long distance and international communications

Business

System

integration

Others

Regional

Communications

Business

real estate, finance,

construction power

business etc.

NTT

DOCOMO

Mobile Communications

business

Dimension

Data

R&D

NTT Group Holding Company

12 Laboratories 2,500 researchers Information Network Laboratory Group

Network Service Systems Lab.

Transport Service Platform Innovation Project (Transport Service System development team)

★ I am here

http://www.ntt.com/

http://www.nttdocomo.co.jp/


• Vision of NTT Laboratories for Stratum

• Stratum Use-cases

• Thin-model cases

• Thick-model cases

• Current Plan for testing and demonstrating Stratum

• Lab-Testing plan

• Use-case feasibility on Stratum

• Interoperability test with Stratum and Smart-NIC

Agenda


• Development transformation for Network systems with open community

NTT’s Network R&D Vision

4

Enterprise Network ・・・ Collective

wisdom

Investors, companies

Cloud

Open community

Hardware

OSS

Telecom carrier network

Users

Core developers

dissemination

productivity and

efficiency customer

satisfaction

Achieve rapid service launches

create business

opportunities

development speed

and flexibility

OpenStack

KVM

OvS/DPDK

Recommended package

Collaboration

Business partner


• Enhance network-service flexibility with open-source

Network service on open-source software

SDN SW

NFV Infrastructure (NFVI)

Virtual Network Functions

(VNF)

EMS

NFV Infrastructure (NFVI)

Virtual Network Functions

(VNF)

EMS

Orchestrator

VNFM

VIM NFVI

VNF

EMS

Operation Support System / BSS

Virtual PF

SDN C

Hardware

CORD

ONOS

TIP （Telecom Infra Project）

OpenStack OPNFV DPDK

ONAP ®

Stratum


• Future carrier networks require programmability for Subscriber Edge and Data-Center Edge

Stratum on Telco Carrier Networks

Telco Carrier Network

etc. WAF DDoS

Mitigation

xDSL FTTH

Internet

Subscriber Edge Router

[Stratum + VNF]

CO（Central Office）

Data Center

Data-Center Edge Gateway

[Stratum + VNF]


• Stratum integrates pipeline definition/control and lifecycle management

Stratum overview

Fixed

ASIC

Programmable

ASIC

Newer

ASIC

Abstraction Layer

P M/A M/A

table

M/A

S

table table

Stratum

Controller

(2) Pipeline Control

Manage lookup tables

and action types

(1) Pipeline Configuration

Describe structures of

parse, match/action, etc

(3) Device Configuration

Run-time operation,

monitoring and metering

(4) Device Operations

File update, device test,

restart, etc

P4 P4Runtime gNMI gNOI


• Stratum has 4 use-cases to integrate control plane

• NTT expects both of Thin/Thick models

Stratum Use-cases

Company-specific controller

Stratum

ONOS

Stratum

Trellis

ONOS

Stratum

Trellis

CORD

Stratum

Embedded Controller

Thin models Thick models

Case. 1 Case. 2 Case. 3 Case. 4


Thin Model

1. Service Chaining and Scaling Edge Gateway

2. DDoS Detection and Steering Function

Thick Model

3. Service Edge Router on Fixed Networks

4. Legacy Function Migration

Stratum Use-cases in NTT Labs.


• Flexible service function chaining

• Auto chaining/scaling

• In-band telemetry between VNFs

Service Chaining and Scaling Edge Gateway

Stratum Controller

vCPE vIPS

P4Runtime

Stratum Stratum fabric

Use-case 1

WAN Existing thick routers






Stratum Controller

vCPE vIPS

P4Runtime


…

Use-case 1

Set traffic-steering







Stratum Controller

vCPE vCPE vCPE vIPS vIPS

P4Runtime


Scaling Scaling

…

Use-case 1








Stratum Controller


P4Runtime


Scaling Scaling

…

Use-case 1



In-band telemetry Using P4


Gateway

• Collect flow-statistics from stratum switches

• Steering traffic to mitigation function when collector detects flow burst

DDoS Detection and Steering Function

Stratum

WAN

Existing thick routers

Controller Collector/

Detector gNMI

Flow Information

Detection Information

Collect flow-statistics

vMitigation Start traffic-steering

Use-case 2


• There are thousands of NTT buildings that has the edge-router(s)

• Can edge-routers be replaced by Stratum?

Edge Router on Fixed Networks

Use-case 3

Existing thick Edge Router

Stratum

VNF


• Edge-router contains service functions (BRAS/BGF/Video-Multicast/VPN-GW…) and Hierarchal QoS function

Today’s Service Edge Router

Edge-router Configuration on Fixed Network Today Service Functions BRAS: - PPPoE termination - AAA(Radius)

BGF: - NAPT - Flow-based shaping - Diffserv

MC(Video Multicast): - PIM/MLD - IP Multicast VPN-GW - Tunnel termination - Dynamic routing

CPE CPE

BRAS

CPE

Thick Edge Router

BGF MC

HQoS

VPN

Core Network

Use-case 3 Edge Router on Fixed Networks


• Architecture:

• Dispatch and Service/User-oriented QoS on Stratum

• Accelerating U-plane function for each services

• Challenges/Issues

• Feasibility of Dispatch/HQoS on switch-chip

• …

Edge-router using Stratum

Use-case 3 Edge Router on Fixed Networks

Stratum Dispatch H-QoS

Stratum BRAS

(U-plane)

C-plane BRAS

(C-plane) VNF BGF VNF Video

Muiticast VNF VPN-GW

Thick model


• There are many “legacy” services provided form telco carrier operators

• Non-IP Protocol

• 10years old, 20years old, and more

• Special(dedicated) interfaces

• Necessity to replace old equipment without changing interfaces and providing functions

Legacy function migration

Use-case 4

Legacy Network

Equipment

Stratum Processing Packet/Frame

Physical Interconnct

Control Function

legacy.p4


Current Plan for testing and

demonstrating Stratum


Lab Testing Timeline (under planning)

2018 2019 (CY)

Use-case Test

Interoperability test

Use-case 1 Chaining and Scaling Edge Gateway

Use-case 2 DDoS Detection and Steering Function

P4Runtime functionality test

Functionality Test

Smart-NIC Interoperability test

Upstream to community

Upstream to community


• P4Runtime L2/L3/ACL Functionality test with ONOS or some gRPC Implementation

P4Runtime functionality test

Stratum

P4Runtime Controller (e.g. ONOS)

Physical Switch

Switch ASIC

Physical Server

Traffic

Generator

L2/L3/ACL Settings


Traffic

Generator

• Integrating VNFs and Stratum

• Verify P4Runtime feasibility and P4 switches

Use-case test

Stratum Controller


P4Runtime

Stratum

BGP FlowSpec

Stratum fabric

Scaling Scaling

…


BGP Tester


• Integrating Stratum and Smart-NIC

• Verify P4switch-P4NIC interoperability

Interoperability test

Stratum

Smart-NIC P4 Switch ASIC P4

Smart-NIC Driver

P4Runtime Wrapper

Controller

P4Runtime/gRPC

In-band telemetry src/sink In-band telemetry transit


• Stratum project may be applicable to many NTT network use-cases

• Stratum is ongoing now. We would like to contribute to stratum with lab-testing and trials

Conclusion and future-plan

ntt’s use-cases and plans for stratum•flexible service function chaining •auto...

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