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Virtual Port Channels: Building Networks without Spanning Tree

Virtualization technologies currently require Layer 2 Ethernet connectivity to function properly. With the increased use of these types of technologies in data centers and now even across data center locations, organizations are shifting from a highly scalable Layer 3 network model to a highly scalable Layer 2 model. What? How can this be? This shift is causing changes in the technologies used to manage large layer 2 environments, including migration away from Spanning Tree Protocol as a primary loop management technology toward new technologies such vPC and Data Center Ethernet.Robert Starmer is a Cisco Data Center Switching Engineer, he joins Robb and Jimmy Ray on set to explain and demonstrate exactly how the technology works.

The Real Data Center Story on UCS

The Cisco Unified Computing System has a fascinating history that highlights the genius of multiple icons of networking from Vmware, to Sun and to multiple Cisco acquisitions dating all the way back through the Andiamo acquisition. David Lawler was a very early contributor to Nuova Systems which grew quickly to become the defining products of the Cisco Nexus family now poised to revolutionize the data center. David chatted with us just prior to the latest round of enhancements so we could catch up on the history, the memory enhancements and the incredible number of people who are still publishing inane comments cause they can’t wrap their head around the innovation. (David was much nicer than that…my comment only 😉 Robb)

What is SIP?

Funny little bit from the archives – as CiscoLive! is fast approaching…Jimmy Ray and I are considering a new voice show on the incredible number of new SIP capabilities in Call Manager 7…I was reminded of this little ditty from October of 2007…it was episode 25….

Long Distance Relationships can Work…for Your Data Centers

We had another live podcast taping for TechWiseTV today and learned a few new things about Data Center Interconnect or as people in the know say: DCI. Amit Singh is a technical engineer who agreed to join us and he was a wealth of information. In fact, we were able to witness one of those rare times where Jimmy Ray is legitimitally surprised with new technology advances. Our primary focus for the conversation was how to deal with data center applications that are demanding a move back to layer 2 and how we can connect geographically disperse DC’s at that layer. We were about halfway into the conversation when the ability to do 802.1AE MacSec encryption took him over the edge. We all get fired up when things head back in a security oriented direction but this is one that Jimmy Ray admitted to being stumped by when trying to tackle it as his previous employer. Turns out he now works for a company that knows how to make stuff work! Give it a listen:

Protocol Fuzzing with Jimmy Ray

Jimmy Ray allows one of his hacking classes to get off topic but loves the result. New blog entry from our favorite geek over at Network World on Protocol Fuzzing. Updated – I missed a chance to recommend Jimmy Ray’s explanation of the role the MTA plays in helping you quickly spot SPAM email – check out The Fine Art of SPAM Detection