VOLTHA Architecture - Open Networking Foundation · 2018-12-18 · Kafka. Kafka. GRPC. High Level Architecture. CLI. OFagent. RESTagent. Netconf. Northbound endpoints. Affinity routing

Copyright © Ciena Corporation 2016. All rights reserved. Confidential & Proprietary.

VOLTHA Architecture

Sergio Slobodrian

Wednesday December 5, 2018

V2.0

Copyright © Ciena Corporation 2016. All rights reserved. Confidential & Proprietary. 2

Contents

Per μService Architectures

Call flows through the system

High Level Architecture

Kubernetes Integration

High Availability Model

Kafka Adapter Messaging Model



Subhead Information


Kubernetes

Kafka

Kafka

GRPC


CLI OFagent RESTagent NetconfNorthbound endpoints

Affinity routing reverse proxy

GRPC

Voltha coreDevice Handler

Device Handler

Device Handler

Device Handler

Device Handler

Device Handler

Read Only

Read Only

Read Only

afrouter

Device Profiles

Message Bus

Adapters Ponsim SimOLT OLTA ONUX OLTB ONUY ONUZ

afrouterd

KafkaKafka

KV Store

volthaetcd


High availability model

Subhead Information
















High Availability Model: Affinity Router Structure

Servers

Routers

Backend Clusters

Server: name, addr, port, routers•••

• A server may reference multiple routers• Routers are keyed by proto package &

service• Only one router per package/service can

be defined per server

Router: name, package, service, routes

•••

Route: name, type, methods …•••

• Multiple routes exist per router.• Route selection is based on gRPC method.• Route types include affinity, round robin,

and binding.• Affinity routes use a proto message value

as a backend selector key. Initial binding direction (north or south) is selectable by RPC.

Cluster: nameBackend: name, type, association …

••••••

Connection: name, addr, port•••

• Each cluster can have multiple backends the routing strategy determines which in the backend is used when

• Each backed can have multiple connections. The association determines how identical messages can be identified





DeviceID BackendCluster

DDD129827 CPx

CCC839032 CPy

XZX187160 CPz

Package Service

voltha VolthaService



DeviceID BackendCluster

DDD129827 CPx

CCC839032 CPy

XZX187160 CPz

Package Service



High Availability ModelDeviceID BackendCluster

DDD129827 CPx

CCC839032 CPy

XZX187160 CPz

Package Service




DDD129827 CPx

CCC839032 CPy

XZX187160 CPz

Package Service




DDD129827 CPx

CCC839032 CPy

XZX187160 CPz

Package Service




DDD129827 CPx

CCC839032 CPy

XZX187160 CPz

Package Service



Kafka Adapter Messaging Model

Subhead Information


Kafka Adapter Message Model

A B C D


Per μService Architecture

Subhead Information


Affinity Router μService

GRPC Server(s)

GRPC Client(s)

Backend Connection(s)

Backend(s)

Backend Cluster(s)

Router(s)

Server Handler(s)

Backend Cluster Handler(s)

Backend Handler(s)

GRPC Config Server

Config &Proto descriptor

Config P

roxy

Config Handler

Stream Handler(s)

Codec

Config Data Control Data & Control


Affinity Router Daemon μService

Kubernetes A

PI C

lient

Device Handler μService Client

Polling Handler

Backend Allocator

Afrouter μService Config Client

Affinity Handler


Device Handler μService

gRPC Server – Northbound Request

Transaction Handler

API Handler

voltha etcd Adapter Proxy

Inter Container Kafka Messaging Proxy

Kafka Client

Flow Decomposer

Adapter Request Handler

Logical Device Agent

Device Agent

KV

Client

Kafka Adapter Message Bus

KV

Shim

Device Manager Logical Device Manager

Device State MachineData M

odel


Read Only μService

API Handler

KV

Client

Data Cache Handler

voltha etcd

gRPC Server – Northbound Request

Data M

odel


Adapter ShimsDevice Handler

Device Handler

Device Handler

Inter-Container Kafka Messaging Proxy

Kafka Client

Adapter ProxyCore ProxyCore Request Handler

iAdapter Abstract Class

OLT Adapter Core Features

KV

Client

KV

Shim

OLTDevices

Core Requests

Inter-Adapter Requests

Kafka

Inter-Container Kafka Messaging Proxy

Kafka Client

Adapter ProxyCore ProxyCore Request Handler

iAdapter Abstract Class

ONU Adapter Core Features

KV

Client

KV

Shim

Core Requests

Inter-Adapter Requests


Transaction Flows Through The System

Subhead Information


Modify Request

Affinity Router

Device Handler

OLT Adapter

Envoy

OLT ONU

Kafka

GRPCGRPC

REST

ONU Adapter

Server

Select router based on package and service; query the router for the backend cluster

RouterProvides both backend clusters and backends based on GRPC call

set affinity as required

Backend ClusterQuery the router for the backend based on the method and selector

field value

BackendOpen the south and

northbound streams to the serv er, generate the serial

number, and start monitoring.

StreamStreamSend to serv er

until EOF.

StreamStreamSend to client

until EOF.To the other

active backend

Transaction Handler

etcd

Secure transaction ownership. Lock serial

number in etcd.

Request Processing

Proxy Handler

Messaging Proxy and Client


Read Request

Affinity Router

Read Only Service

Envoy

GRPCGRPC

REST

Server


RouterProvides both backend clusters and backends based on GRPC call.

Reads use round-robin

Backend Cluster

Query the router for the backend based on the a round-robin algorithm




StreamSend to serv er

until EOF.

StreamSend to client

until EOF.

etcd

Read Processing

Load the requested data from etcd


Control Plane Packet Flow Init

Affinity Router

Device Handler

OLT Adapter

OLT ONU

Kafka

GRPC

ONU Adapter

Server


Router

Provides both backend clusters and backends based on GRPC call

Backend Cluster

Query the router for the backend and bind to it

permanently




StreamStreamSend to serv er

until EOF.

StreamStreamSend to client

until EOF.To the other

passive backend

Transaction Handler

etcd

The transaction handler is a noop for control plane flows

Request Processing

Proxy Handler

Messaging Proxy and Client

OFAgent


Kubernetes Integration

Subhead Information


K8s Integration

35Copyright © Ciena Corporation 2016. All rights reserved. Confidential & Proprietary.

Documents

VOLTHA Architecture - Open Networking Foundation · 2018-12-18 · Kafka. Kafka. GRPC. High Level Architecture. CLI. OFagent. RESTagent. Netconf. Northbound endpoints. Affinity routing