Network Topology Discovery

Terry Slattery
Principal Architect

I had the privilege of reviewing a neat paper, Network Topology Discovery, by Eric Siegel, a technical analyst at the Burton Group.  His paper covers a many aspects of network topology discovery in 30 pages, sprinkled with details on how things work.  I found it to be a very well written paper, covering the topic very thoroughly.  I can’t promise that the paper is free (their business depends on selling their papers).  If you’re interested in a copy, contact Eric at  He will put you in touch with the appropriate sales person at Burton and it’s up to you from there to convince them that you deserve a free copy. 😉  Subscribers to the Burton Group’s services will be able to download it for free.

Topology discovery is an interesting topic and is one that we have worked hard to implement well.  We recently had a customer decide to use our products as the ‘master repository’ of device discovery, due to the accuracy and depth of the resulting inventory.  A key component of discovery is classification of the discovered devices.  Knowing that a device is a router, a switch, or a Linux system performing routing and switching, or a Cisco ISR that performs routing, switching, firewall, and wireless are important data to knowing what’s in your network and being able to track down problems caused by those devices. -Terry


Re-posted with Permission 

NetCraftsmen would like to acknowledge Infoblox for their permission to re-post this article which originally appeared in the Applied Infrastructure blog under


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Nick Kelly

Cybersecurity Engineer, Cisco

Nick has over 20 years of experience in Security Operations and Security Sales. He is an avid student of cybersecurity and regularly engages with the Infosec community at events like BSides, RVASec, Derbycon and more. The son of an FBI forensics director, Nick holds a B.S. in Criminal Justice and is one of Cisco’s Fire Jumper Elite members. When he’s not working, he writes cyberpunk and punches aliens on his Playstation.


Virgilio “BONG” dela Cruz Jr.

CCDP, CCNA V, CCNP, Cisco IPS Express Security for AM/EE
Field Solutions Architect, Tech Data

Virgilio “Bong” has sixteen years of professional experience in IT industry from academe, technical and customer support, pre-sales, post sales, project management, training and enablement. He has worked in Cisco Technical Assistance Center (TAC) as a member of the WAN and LAN Switching team. Bong now works for Tech Data as the Field Solutions Architect with a focus on Cisco Security and holds a few Cisco certifications including Fire Jumper Elite.


John Cavanaugh

CCIE #1066, CCDE #20070002, CCAr
Chief Technology Officer, Practice Lead Security Services, NetCraftsmen

John is our CTO and the practice lead for a talented team of consultants focused on designing and delivering scalable and secure infrastructure solutions to customers across multiple industry verticals and technologies. Previously he has held several positions including Executive Director/Chief Architect for Global Network Services at JPMorgan Chase. In that capacity, he led a team managing network architecture and services.  Prior to his role at JPMorgan Chase, John was a Distinguished Engineer at Cisco working across a number of verticals including Higher Education, Finance, Retail, Government, and Health Care.

He is an expert in working with groups to identify business needs, and align technology strategies to enable business strategies, building in agility and scalability to allow for future changes. John is experienced in the architecture and design of highly available, secure, network infrastructure and data centers, and has worked on projects worldwide. He has worked in both the business and regulatory environments for the design and deployment of complex IT infrastructures.