1. Dont panic
2. Get the right resources engaged
3. What was the last thing that changed?
4. Get the Data that you can (Layer 1-3)
5. Learning when to escalate
6. Was this a process problem? How do we avoid this?

Russ White has over 30 years of experience in network engineering; A Distinguished Architect during his time at Cisco, holds the highest certification Cisco has to offer as a CCAr and holds CCDE #1. He’s also a Publish author, worldwide speaker at many tech conferences, and has over 40+ patents. This guy is a legend folks in the field of networking. 

Quote: “Each day we are becoming a creature of splendid glory or one of unthinkable horror.” C.S. Lewis

Shawn Zandi is a lead infrastructure architect with LinkedIn, where he builds large scale data center, backbone and networks. Over the past two decades, Shawn has worked as network and security architect for consulting firms from Dubai to Silicon Valley. Shawn holds many publications, patents and certifications including 3x CCIE in routing and switching, Security and eSrvice provider as well as CCDE, while through the years of practice has become a vendor-neutral consultant. He currently lives in San Francisco, in Sunny California. In addition to his commitment to LinkedIn, Shawn is a technical advisor to networking startups in the Bay Area.

Quote: RFC1925 - The Twelve Networking Truths Rule (11)