What problem is OTV trying to solve? Key virtualization features in the data centre like vMotion require flat layer 2 networks to function. These layer 2 networks often span multiple data centres. However, to design the underlying network as layer 2 runs against best practices of limiting the size of our Layer 2 domains, both for efficient operation and reducing […]
Read more "Introduction to OTV (Overlay Transport Virtualization)"“Stacking” switches involves connecting multiple switches together using special StackWise ports on the rear of the switch. Each switch in the stack is referred to a member of the stack. Members work together as a unified system, appearing administratively as a single switch. A switch stack of 3650/3850s (note you can’t mix these in a stack) […]
Read more "Stacking Cisco 3650/3850 switches"If you’re an engineer for a WAN service provider, sooner or later you’re going to encounter a customer with a requirement to multicast between their remote sites. The problem is most service provider WAN networks don’t support multicast traffic through their core networks. And with good reason. Multicast routing (mroute) tables are subject to a […]
Read more "Multicast over GRE tunnels"There’s a number of options available for filtering, in an otherwise straightforward routing protocol (read it’s a fertile area for weasly lab questions). Awareness of all options available is important in selecting the correct method for configuration of lab tasks. It’s typical to be given restrictions about how not to configure a task. What remains are the […]
Read more "RIP Filtering"Here in the uk you can buy a brand of bread with the strapline “best of both”. Fabricpath aims to be the best of both, combining the best aspects of Layer 2 and the best aspects of Layer 3 networks. Let’s take a look at the fundamentals. What is Fabricpath? Yet another alternative to spanning-tree. […]
Read more "Fabricpath Basics"Every once in a while someone will add to the growing list of blog posts with a formula for both understanding and retaining a large body of knowledge and understanding required to clear Cisco Certifications. Petr, who wrote the above prescription, cleared 4 x CCIE exams in 18 months so this clearly worked for him. The fact is though […]
Read more "Study Skills for Cisco Certification"
SI DARLINGTON 