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3/19
2015
Terry Slattery

SDN and an Object-Oriented Data Model

An Object-Oriented data model will be critical to SDN.

Why is an Object-Oriented Data Model Important?

I’ve started to learn about a variety of SDN APIs. Cisco’s ACI (Application Centric Infrastructure) was the starting point. One of the first documents I found is Network Programmability with Cisco Application Centric Infrastructure. At least ACI, and I assume the other SDN developments, is using an object-oriented data model for network configuration. This makes a lot of sense.

Consider a network as the top object. It is composed of various hardware elements (routers, switches, and firewalls, etc.) and software functions (network protocols, filters, etc.). Each of these elements is composed of sub-elements. In the case of hardware, there are modules and interfaces. Routing protocols have peers or even multiple instances of routing protocols. Controlling and configuring the network based on these objects makes a lot of sense.

The above document also talks about the Management Information Tree (MIT). Remember the SNMP MIB (Management Information Base)? Well, the MIT is the same thing, only applied to ACI. It is a tree structure, just like the SNMP MIB. This guarantees that each object appears only once and that there is a unique name for accessing that object. The MIT name for each object is used by the REST (Representational State Transfer) API, with either XML or JSON encoding. [Note: XML and JSON use very similar representations of objects and supporting both makes a lot of sense.] I certainly hope that the teams that are working on the data model for QoS make it simpler than the Class-Based-QOS MIB that we had with SNMP.

It’s Déjà vu All Over Again

Seeing the object-oriented data model brought back memories of thinking about network management many years ago. I had a revelation, as I’m sure many other NMS developers have had, that networks should be represented by an object-oriented data model. The hierarchy of elements within a network just feel like that model would be best. I never had the opportunity to explore the idea any further.

Summary

I think that using an object-oriented data model will help us create new abstractions that simplify how we think about networks. We network folk are going to have to start learning about XML, JSON, object-oriented data models, and object-oriented programming. This will allow us to better communicate with software developers who are going to be building a lot of the future SDN control systems.

Terry Slattery

Terry Slattery

Principal Architect

Terry Slattery is a Principal Architect at NetCraftsmen, an advanced network consulting firm that specializes in high-profile and challenging network consulting jobs. Terry is currently working on network management, SDN, business strategy consulting, and interesting legal cases. He is the founder of Netcordia, inventor of NetMRI, has been a successful technology innovator in networking during the past 20 years, and is co-inventor on two patents. He has a long history of network consulting and design work, including some of the first Cisco consulting and training. As a consultant to Cisco, he led the development of the current Cisco IOS command line interface. Prior to Netcordia, Terry founded Chesapeake Computer Consultants, which became a Cisco premier training and consulting partner. At Chesapeake, he co-invented and patented the v-LAB system to provide hands-on access to real hardware for the hands-on component of internetwork training classes. Terry co-authored the successful McGraw-Hill text "Advanced IP Routing in Cisco Networks," is the second CCIE (1026) awarded, and is a regular speaker at Enterprise Connect and Interop. He currently blogs at TechTarget, No Jitter and our very own NetCraftsmen.

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