8 software defined networking and traffic engineering partha narasimhan_ash chowdappa

CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved

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So#ware Defined Networking &

Traffic Engineering Partha Narasimhan & Ash Chowdappa

March 2013


-‐ IntroducNon to SDN -‐ SDN EvoluNon & Traffic Engineering -‐ Wired + Wireless SDN Architecture -‐ SDN Use Cases -‐ Simplified network designs with SDN ?

Agenda


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IntroducNon to SDN

CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 4 #airheadsconf

So#ware Defined Networking

•  SoWware-‐defined networking decouples network control (rouNng and switching traffic) from the physical network topology

•  Network intelligence and state are centralized, network topology is abstracted and virtualized

•  Open Networking FoundaNon consorNum is leading standardizaNon efforts

•  h\ps://www.opennetworking.org/

•  OpenFlow is a protocol that facilitates communicaNon between SDN Controllers and SDN capable network elements.


SDN Logical Architecture*

* h\ps://www.opennetworking.org/images/stories/downloads/white-‐papers/wp-‐sdn-‐newnorm.pdf


SDN & OpenFlow benefits*

* h\ps://www.opennetworking.org/images/stories/downloads/white-‐papers/wp-‐sdn-‐newnorm.pdf

•  Centralized management and control of networking devices from mulNple vendors

•  Increased network reliability, security, uniform policy enforcement, and fewer configuraNon errors

•  More granular network control with the ability to apply comprehensive and wide-‐ranging policies at the session, user, device, and applicaNon levels

•  Be\er end-‐user experience as applicaNons exploit centralized network state informaNon to seamlessly adapt network behavior to user needs.


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SDN EvoluNon & Traffic Engineering Home vs Enterprise Networks


SDN Categories

Datacenter/Core Infastructure

Access Infrastructure


Quest to simplify end user experience & network operaHons

Typical “Home” networks •  Handful of personal devices •  Single broadcast domain in home networks

Enterprise networks •  100’s of Broadcast domains •  Security policies •  1000’s of devices

© Copyright 2012. Aruba Networks, Inc. All rights reserved

10

Aruba SDN Framework EvoluHon

WLAN Infrastructure Virtualization

WLAN + Services

Virtualization

Wireless + Wired

1.  Seamless WLAN overlay deployment

2.  VLAN “virtualizaNon”

3.  Broadcast/MulNcast arbitraNon for WLANs

4.  Centralized controller based flow control

1.  “AirGroup” mDNS centralized control plane – services, topology virtualizaNon

2.  Abstract underlying L2/L3 network topology

1.  Centralized arbitraNon point for network, services discovery protocols

2.  Traffic engineering with virtual topology


Example of Network VirtualizaHon Virtual VLANs on Wireless LANs

User VLANs “virtualized” i.e. they are not instanNated on the edge switches that the APs are connected.


• Special handling for ARP, v6 ND, DHCP –  Drop everything else (breaks services such as Bonjour)

• AirGroup – mDNS protocol specific handling –  Can we generalize AirGroup to handle any generic Bcast/Mcast protocol ?

–  Network neighborhood defined by policy and independent of physical network topology

• Need good BC/MC handling for all physical network designs

Example of Network Services VirtualizaHon Special Broadcast / Mul:cast handling


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Wired + Wireless SDN Architecture


Person

alized

Experience

User

Simplify Network Ops

IT

So#ware Defined Unified Access

VPN

Access Policy Mobility State Performance

Management LocaNon Content Network Apps AnalyNcs

Onboard New Apps, BYOD & Guests

Flow Awareness, App Services

Monitor Wi-‐Fi, Wired & WAN Controller AirWave ClearPass

SDN Control Plane


Flow Steering with OpenFlow

OF OF OF

OF

OF OF OF

OF

OF OF OF

OF

•  Virtual cut-through paths per user/app

•  Unified access on multi-vendor network

•  Stitching flows across roles

OF


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Use Cases: PersonalizaNon with Dynamic Topologies


So#ware Defined Personalized Networks


Air Services

  Visibility of services based on ownership, locaNon and role

Branch


Aruba AirGroup Example: Student Mary

Personal AirGroup “Mary”

Shared AirGroup “Students”

Local AirGroup “Lab”

Mary’s MacBook

Mary’s iPad

Classroom Apple TV

For teachers only

Dormitory Printer

Library Printer

Lab Apple TV

Auditorium Printer

For teachers only

Mary’s Apple TV

Mary’s Friend Mike

Mary’s Friend Jen


Per User, Device Security

Branch

SSID: Corporate

  MulNple user, device policies under the same SSID


200 Mbps

600 Mbps

Dynamic RF topology based on applicaHon QoS, delivery context

  Best Wi-‐Fi rates for each mobile device

  Best topology (AP, channel selecNon) is driven by App QoS requirements

HQ

400 Mbps

108 Mbps

54 Mbps

36 Mbps


• SDN may present an opportunity to simplify network designs – With special Bcast/Mcast handling for Wired/Wireless the size of broadcast domain may not ma\er

–  Dynamic SDN topologies imply physical and logical L2/L3 topologies are less relevant

• A flat L2 for IPv6 only (Wired) ? –  Keep current v4 design, move v6 traffic into an overlay VLAN

• “Solve” L3 mobility with simplified topology

Future network designs with SDN


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Thank You

Technology

8 software defined networking and traffic engineering partha narasimhan_ash chowdappa