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Prof. Danny Raz, Director, Bell Labs Israel, Nokia
1.
1 © Nokia
2016 Bell Labs SDN and NVF: a revolution or same old stuff? WAS: The next generation of Openflow and SDN ChipEx 2016 Danny Raz 09-05-2016 Nokia External Use
2.
2 © Nokia
2016 2 Traditional networks • Traditional Network architecture: - Data plane and control plane are collocated - Control packets are sent inbound and - Based on these packets the switches configure/update their FIB/RIB Control: routing alg routing tables RIB data: packets card forwarding tables FIB
3.
3 © Nokia
2016 3 SDN Software define Networks • SDN Architecture: - Data Plane and control plane are decoupled - A centralized controller is used to configure the FIB - A Common configuration protocol: Openflow Openflow agent Openflow agent Openflow agent Openflow agent Openflow agent SDN Controller
4.
4 © Nokia
2016 4 Openflow agent Openflow agent Openflow agent Openflow agent Openflow agent SDN Controller • The controller has a global view of the network topology – as it collects information from the network elements SDN Controller Communication to network element Network OS Internal view of topology Network Virtualization Desired behavior Network Control VLAN, TRILL, SNMP, ACL, MPLS, OSPF, analytics, RIP, BGP, RSVP, .. SDN Software define Networks
5.
5 © Nokia
2016 5 OpenFlow Openflow agent Openflow agent Openflow agent Openflow agent Openflow agent SDN Controller • The communication between the network elements and the controler – Can be done using OpenFlow Communication to network element Network OS Switch Port MAC src MAC dst Eth type VLAN ID IP Src IP Dst IP Prot L4 sport L4 dport Rule Action Stats 1. Forward packet to zero or more ports 2. Encapsulate and forward to controller 3. Send to normal processing pipeline 4. Modify fields 5. Any extensions you add! Packet + byte counters VLAN pcp IP ToS
6.
6 © Nokia
2016 A networking scenario • Web browsing - A user is connected from home via her WiFi - Opens a browser - Goes to cnn.com and checks on Bin-Laden Internet • Web browsing - A user is connected from home via her phone - Opens a browser - Goes to mymusic.com and checks on Straight Outta Compton - Lamar Odom Jurassic World American Sniper Caitlyn Jenner Ronda Rousey Paris Agar.io Chris Kyle Fallout 4 Straight Outta Compton
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7 © Nokia
2016 What is going on? • User is connected to the WiFi Access Point • Wireless router is connecting to the service provider via ADSL • Connection to remote server • Downloading the file Internet
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8 © Nokia
2016 The application layer of the laptop computer senses the existence of the WiFi network and connects (or asks the user) to the network by setting the “right” parameters to the physical and the MAC layers. What is really going on? • WiFi – 802.11 network • ADSL connection • Connection to remote server • Downloading the file Internet Physical layer Link layer Application layer
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9 © Nokia
2016 What is really going on (2)? • WiFi – 802.11 network • ADSL connection • Connection to remote server • Downloading the file Internet The ADSL router connects over the PTN to the ISPs Point of Present at the Central Office of the Public Telephony Network Infrastructure Provider (BEZEK) and from there to the ISP’s Internet service provider RAP Remote Access Point and establishes a PPP Point to Point connection Application layer
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10 © Nokia
2016 What is really going on (3)? • Dial up networking • User login • Connection to remote server • Downloading the file Internet A DHCP Dynamic Host Configuration Protocol message is sent to the DHCP server at the ISP, resulting in an assignment of a valid IP address to the ADSL router. Then an ARP Address Resolution Protocol is used to update the machine networking stack. Link layer Application layer DHCP ARP “Creating” an IP connection Networking layer
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11 © Nokia
2016 מחשבים לרשתות מבוא(236334)©כהן ראובן,המחשב למדעי הפקולטה,טכניון What is really going on (4)? • Dial up networking • User login • Connection to remote server • Downloading the file Internet A DNS Domain Name Server message is sent to the DNS server who may need update from other DNS servers, resulting in the translation of the server name to a valid IP address. A TCP Transport Control Protocol connection is established between the host and the remote server Physical layer Link layer Application layer DNS DNS TCP Networking layer Transport layer
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12 © Nokia
2016 What is really going on (5)? • Dial up networking • User login • Connection to remote server • Downloading the file Internet An HTTP Hypertext Text Transfer Protocol message is sent to the remote server with the name of the wanted file Get Bin- Laden.html and the data in the file is sent back through the TCP connection to the host. Application layer Networking layer Transport layer Get SOC.html TCP
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13 © Nokia
2016 What is really going on (6)? • Dial up networking • User login • Connection to remote server • Downloading the file Internet What you see is NOT what you get. NAT Network Address Translation is used to change the IP address, firewalls are used to check the content of the packets, and proxy servers or even CDN Content Distribution are used as the source of the data Link layer TCP Link layer Application layer Networking layer Transport layer TCP Proxy Server Physical layer Link layer Physical layer Link layer Application layer Networking layer Transport layer Application layer Networking layer Transport layer DPI NAT
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14 © Nokia
2016
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15 © Nokia
2016 01001110001101 01100111100110 01101010101110 Basically Transport information from place to place Transport bits from place to place Transport packets from place to place The Network
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16 © Nokia
2016 Basically Transport information from place to place Transport bits from place to place Transport packets from place to place Actually People can talk (video-conf) People can text (or Whatsapp) Communities can be formed Machines can share state Applications can …. )real time traffic, public transportation, ….( The Network
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17 © Nokia
2016 Much more than just Transport packets from place to place Actually People can talk (video-conf) People can text (or whatsup) Communities can be formed Machines can share state Applications can …. )real time traffic, public transportation, ….( DPI DPI DPI DPI DPI SBC SBC SBC SBC SBC SBC EPC EPC EPC EPC EPC EPC PCE LTE TE PDN-GW S-GW SGSN/GGSN SIP NAT RSVP The Network
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18 © Nokia
2016 A Network Service Composed of one or more network functions Service function chaining Currently Functions (and services) are implemented via dedicated hardware located on the flow path DPI DPI DPI DPI DPI SBC SBC SBC SBC SBC SBC EPC EPC EPC EPC EPC EPC PCE LTE TE PDN-GW S-GW SGSN/GGSN SIP NAT RSVP The Network is a service
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19 © Nokia
2016 A Network Service Composed of one or more network functions Service function chaining DPI EPC PCE LTE TE PDN-GW S-GW SGSN/GGSN SIP NAT RSVP Distributed Cloud Networking Functions (and services) are implemented on COTS servers located at mini) data centers distributed within the network Traffic is send to these servers using the control mechanism of SDN SDN Controller The Network is a service
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20 © Nokia
2016 Service chaining use case Source: ETSI Ongoing PoC • SDN controller controls both • physical networking devices • virtual networking devices • And works both • inside data centers • across WAN
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21 © Nokia
2016 NFV + SDN – not so simple Can we get the performance we (want) need Can we get the reliability we (want) need Isn’t this too complex )to operate( More specifically for SDN: efficient implementation ability to support many TCAM rules hardware / software support for virtual switches programmable modules Vs. pure SDN approach
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22 © Nokia
2016 Nokia External Use In a nutshell It is about the Implementation of the virtualization
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