Ryu is an open source SDN framework developed by NTT that provides libraries for building SDN applications. It supports OpenFlow, various protocols including BGP, and can be used to automate network devices like whitebox switches. The document outlines several use cases such as MPLS VPN automation using Ryu with OpenFlow and BGP, monitoring route changes using BMP, and DoS mitigation at internet exchanges. Future plans include improving support for new OpenFlow versions, protocols, and integrating with whitebox switches.

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Ryu SDN Framework
FUJITA Tomonori
NTT Software Innovation Center
Ryu Project Lead

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• What’s Ryu?
• Use cases
• #1 Cloud and MPLS VPN automation
• Whitebox switch
• #2 BMP Server
• #3 SDN IX DoS mitigation
• Future Plans
Agenda

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• OSS SDN Framework founded by NTT
• Python library for SDN
• Apache v2 license
• More than 400 mailing list subscribers
• Features
• OpenFlow
• Version 1.0, 1.2, 1.3, 1.4, 1.5 (in progress)
• Parsing and building various protocols packets
• IP, TCP, UDP, MPLS, OSFP, PBB, etc
• BGP, VRRP, BFD, BMP
• BGP speaker supports BGP4 and MPBGP (v6 and
MPLS/VPN)
What’s RYU?

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Who uses?
and more…

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Use case #1: Cloud and MPLS VPN
MPLS L3 VPNOF
Switch
Software inside the switch
OF
Controller
BGP
Speaker
eBGP
Tenant
Network
vRouter
Direction VLAN Prefix VPN Label
DC -> VPN Match & Pop Push
VPN <- DC Push Match & Pop
Info from Cloud system
Info from BGP
Cloud
Orchestration
System
Used in production as
of 2014/10
PE
Customers can manage cloud and
network settings via the cloud portal and
the change are reflected immediately to
the gateway switch

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Use case #1: lessons learned
Ryu (OpenFlow + BGP) + OpenFlow
Whitebox Switch
=
Router fully easily integrated with
the existing infrastructure
• OpenFlow is not a must (one of southbound protocols)
• Whitebox Switch + Linux OS enables this SDN

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• Merchant silicon + Linux OS
• Commodity hardware switch from ODMs in Taiwan
• Whatever software you can install
• Routing (BGP, etc)
• Monitoring
• Automation
Whitebox Switch
• Vendor provides BGP new feature timely?
• You still like to monitor via SNMP?
• You can automate switch configuration with the existing
systems?
Facebook developed their original
switch (Accton manufactured)

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• BGP Monitoring Protocol
• Monitoring Adj-RIBs-In changes
Use case #2 BMP Server
BGP
Peer
BGP
Peer
Adj-RIBs-In
Adj-RIBs-In
Local RIB
Filter
Filter
BGP router
Ryu BMP server
You could modify Ryu BMP server to send
notification via email, tweet, etc when something
(strange received route, etc) happens

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• Blocking traffic at Internet Exchange
• Demo at Interop 2014 by Internet Multifeed
Use case #3 SDN-IX DoS mitigation
AS1
IX
AS2OF
SW
Configure the blocking
policy via web portal
Ryu
OF controller

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Linux kernel
• OpenFlow
• New specification (1.5 for now)
• Software for Whitebox switch
• APIs for silicon in Linux
• Protocol stack (mainly BGP)
• Whatever necessary
Future Plans
HW
Kernel driver
SDK
OF
Agent
Use
Netlink, etc
Use
OpenFlow
Use
Vendor
Silicon
SDK API
Whitebox swtich API example

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• Use case: high performance
• IX route server
• Multi threads
• Thread to send keepalive messages per peer
• Thread for routing per rib
• Thread for reading bgp messages from socket per peer
• Modern management interface
• JSON REST API
• CLI is implemented in Python by wrapping REST API
(easy modify for your preferable output format)
New Ryu BGP speaker implementation
Parsing 70K BGP updates; each includes 8 routes
Old: 5.584 secs v.s. New: 0.205 secs
https://github.com/osrg/gobgp

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Thanks!
Questions?

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• What’s OpenStack?
• OSS for building IaaS
• You can run lots of VMs
• Many SDN solutions are supported
• How Ryu is used?
• Tenant network separation (virtual L2 network on the
top of L3 network)
• BGP support (chosen as the default BGP
implementation)
Use case #4 OpenStack integration