In the Myths That Refuse to Die: Scalability of Overlay Virtual Networking blog post I wrote “number of MAC addresses has absolutely no impact on the forwarding performance until the MAC hash table overflows”, which happens to be almost true.
Read more ...I was fortunate enough to be invited out to Milan, Italy for Cisco Live Europe, and we had a few interesting discussions about a multitude of topics. One of them was more free-form than the others, and focused on defining SDN, what it’s value is, and where that value is most realized.
Check out this video recording of the session; it was good to get a few perspectives from non-networkers, since I’m sure their perspective is different from the network administrator’s as it pertains to the ongoing shift in this industry:
For the record, it’s not fair to say that VLAN provisioning takes two weeks, even after change approval. What the server administrator is usually asking for is an entirely new logical network, and there’s much that has to happen in order to do this, the easiest of which is tagging the server port on the ToR. These networks have dependencies, like IP space, firewall and load balancer contexts. Sometimes, routing configurations have to be changed. Is the current provisioning model optimal, or even acceptable? Of course not – that’s why I’m focusing on the newer, more automated methods. However, there’s more than meets the eye here.
I also want Continue reading
I was fortunate enough to be invited out to Milan, Italy for Cisco Live Europe, and we had a few interesting discussions about a multitude of topics. One of them was more free-form than the others, and focused on defining SDN, what it’s value is, and where that value is most realized.
Check out this video recording of the session; it was good to get a few perspectives from non-networkers, since I’m sure their perspective is different from the network administrator’s as it pertains to the ongoing shift in this industry:
For the record, it’s not fair to say that VLAN provisioning takes two weeks, even after change approval. What the server administrator is usually asking for is an entirely new logical network, and there’s much that has to happen in order to do this, the easiest of which is tagging the server port on the ToR. These networks have dependencies, like IP space, firewall and load balancer contexts. Sometimes, routing configurations have to be changed. Is the current provisioning model optimal, or even acceptable? Of course not - that’s why I’m focusing on the newer, more automated methods. However, there’s more than meets the eye here.
I also want Continue reading
Over the next few months, several enhancements and upgrades to the CCIE Routing and Switch product line will be rolled out. I am currently doing a thorough review of the Volume 1 Workbook to ensure that every topic within the Version 5 Blueprint is thoroughly tested and validated. Shortly thereafter, I will be editing and compiling the complete Volume 2 Mock Lab workbook with 5 full 8-hour labs. These labs will fully prepare students for success on the rigorous Cisco CCIE lab exam.
After listening to the feedback of current and prospective students, I realized that the Troubleshooting and Diagnostic Sections were a stumbling block for many and that these sections were under-represented in the current training program. As a result, new Troubleshooting and Diagnostic workbooks are currently under development with a target completion date within the next 2 months. The Troubleshooting workbook will contain 50 tickets that are similar in difficulty to the tickets the student will experience in the Cisco lab exam. Similarly, the Diagnostic workbook will also contain 50 issues and be designed to allow students to hone their skills, and become confident in their ability to identify and choose the correct solution(s) in this section of Continue reading