OpenFlow and Software Defined Networking presented by Greg Ferro
Software Defined Networking (SDN)
would like to thank Greg Ferro and Ivan Pepelnjak for giving us the opportunity to sponsor to this educational webinar on OpenFlow and SDN, technologies core to our offering. More information at: www.bigswitch.com
Contact us at:
[email protected]
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CONTROLLERS AND SOFTWARE DEFINED NETWORKING 71
REALITY CHECK “[OpenFlow] doesn’t let you do anything you couldn’t do on a network before” - Scott Shenker
Frames are still forwarded, packets are delivered to hosts. It’s still early stage technology but commercial products are shipping
You don’t need OpenFlow to solve every age-old problem. - Ivan Pepelnjak
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BACKTRACK Today, your Routing Protocols / STP determine the Forwarding Table in your network.
Switch OS handles device management and operations. STP, TRILL, OSPF, BGP MIGHT be used.
OpenFlow is another method for configuring the Forwarding table in the Network Switch
OpenFlow describes a solution for each frame or packet flow Wildcards provide granular control to suit 73
CONTROLLER
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The controller will need to derive the desired forwarding data in software, Then send OpenFlow messages to update the Forwarding Table in the device. The messages can add, update or delete entries in the Forwarding table.
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SOFTWARE DEFINED NETWORKING A controller is a software program that sends and receives OpenFlow from network devices.
Because the controller must compute the flow paths in software this is usually known as SOFTWARE DEFINED NETWORKING
The controller sends OpenFlow entries for the forwarding table
Abbreviated to “SDN”
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CONTROLLER CONCEPTS Controller drives a level of network convergence that was previously unimaginable. Consider changing all the configuration on your network to support new network path every 10 minutes ? Todays’ tools cannot do that. SNMP can’t do configuration. CLI programming is too diverse between vendors (and no standards will ever solve that). See RFC3535. 78
CONTROLLER WEAKNESS If routing is negatives, so do controllers.
Transaction ability of controller, device in relation to service required.
Bandwidth between controller and device. Controller availability and reliability. (stability)
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CONTROLLER ARCHITECTURES 5 minutes ( Please wash hands )
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CENTRALIZED OR DISTRIBUTED Controller Active
Device
Controller Standby
Device
Device
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Device
DISTRIBUTED Controller Signalling
Controller
Device
Device
Controller
Device
Controller
Device
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Device
Device
MULTILAYER Controller
Controller
Controller
Controller
Controller
Controller
Controller
Device
Device
Device
Device
Device
Device
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DEVIATION: DISTRIBUTED COMPUTING Distributed computing WAS a major challenge
Companies - Google, Amazon et al.
In the last five years, major developments in the delivery and management
Distributed Controllers are likely in the longer term. “Big Data” controllers further out.
Application examples: Hadoop, MongoDB, blah blah big data fashion of today
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SNMP / NMS We have form a SDN today in Network Management Systems.
RFC3535 agreed that “The SNMP transactional model and the protocol constraints make it more complex to implement MIBs, as compared to the implementation of commands of a command line interface interpreter”
SNMP works for simple data such as counters & status. SNMP is agreed to be unusable for configuration The SNMP/SMI/ASN.1 suite describes data formats and protocol interactions. 85
SNMP / NMS “SNMP does not support easy retrieval and playback of configurations”
“There is often a semantic mismatch between the task-oriented view of the world usually preferred by operators and the datacentric view of the world provided by SNMP.”
“There are scaling problems with regard to the number of objects in a device.”
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APPS & CONTROLLER Se r Fl pe n O
For SDN, the controller is usually regarded as the software element that interfaces to the network devices.
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APPS & CONTROLLERS al ion rtu at Vi igur nf Co
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Apps run on the controller to provide usable services
P BG
OS
In practice, the controller is an platform or an API for sending and receiving data from the Network
Controller - APIs, Core Software, Common Code etc
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APPS BigSwitch has open sourced their FloodLight OpenFlow Controller. (http://
BGP Route Server for interop with existing BGP Cores. (RouteFlow)
floodlight.openflowhub.org/
MPLS Edge (Ericsson)
Foundation of a commercial controller that is a basis for their Network Virtualisation App. Other App under development:
Firewalls / Security Flow Balancing (FlowScale) LoadBal, Security,
build a large cluster of Snort servers and balance all of our mirrored traffic from several routers across the cluster.
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ECOSYSTEM User Presentation Layer
CLI
Management Protocol Physical Network
SSH / Telnet
Device
Device
Device
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Device
Device
ECOSYSTEM (CONT.) User Presentation Layer
Presentation Layer Configuration Manager, Asset Management, Automation, User Interface, Operational APIs etc
CLI
SNMP
SSH / Telnet
Management Protocol Physical Network
Device
Device
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Device
Device
Device
Application
Controller
App [LoadBal]
App [Firewall]
App [Routing]
Existing Network Management Systems
App [Switch/L2]
Open Controller Vendor Controller
Management Protocol Physical Network
OpenFlow
Device
CLI
SSH / Telnet
SNMP
Device
Device
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Device
Device
ECOSYSTEM (Cont.)
Presentation Layer Configuration Manager, Asset Management, Automation, User Interface, Operational APIs etc
Application App [Switch/L2]
App [LoadBal]
App [Firewall]
There are other standards
App [Routing]
OpenFlow is Controller
Open Controller Vendor Controller
Management Protocol Physical Network
OpenFlow
Device
NetConf /Yang
Device
Vendor / Proprietary XML APIs
Device
Device
Device
ECOSYSTEM (Cont.)
Presentation Layer Configuration Manager, Asset Management, Automation, User Interface, Operational APIs etc
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Cloudy Devops
OpenStack
VMware vCenter / MS SCVMM
Custom Automation
Presentation Layer Configuration Manager, Asset Management, Automation, User Interface, Operational APIs etc
Application CLI
Controller
App [LoadBal]
App [Firewall]
Existing Network Management Systems
App [Switch/L2]
App [Routing]
Open Controller Vendor Controller
Management Protocol Physical Network
OpenFlow
Device
NetConf /Yang
Device
Vendor / Proprietary XML APIs
Device
SSH / Telnet
SNMP
Device
Device
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ECOSYSTEM (Cont.)
User Presentation Layer
You can find more information about our company and our offering at www.bigswitch.com Our open source solutions are posted at www.openflowhub.org If you have any further question please do not hesitate to contact us at:
[email protected]
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THANKS http://packetpushers.net http://www.bigswitch.com http://ipspace.net
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