Here is the Cisco FEX Cheat Sheet on Nexus platform, Fabric Extender (FEX for short) is a companion to a Nexus 5K to 9K switch. The FEX, unlike a traditional switch, has no capability to store a forwarding table or run any control plane protocols. It relies on its parent 5K/6K/7K/9K to perform those functions. As the name implies, the FEX “extends” the fabric (ie, the network) out towards the edge devices that require network connectivity.
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Here is the Cisco FEX Cheat Sheet on Nexus platform, Fabric Extender (FEX for short) is a companion to a Nexus 5K to 9K switch. The FEX, unlike a traditional switch, has no capability to store a forwarding table or run any control plane protocols. It relies on its parent 5K/6K/7K/9K to perform those functions. As the name implies, the FEX “extends” the fabric (ie, the network) out towards the edge devices that require network connectivity.
If you found a bug or want new content to be added, please report it!
Flask includes a Python decorator which allows you to run a function before the first request from a user is processed. The problem I had is that the function doesn’t get run until after a user has visited a page for the first time. This article describes a way to solve that. If you haven’t heard of Flask before it’s a Python microframework for web applications. With Flask you can create small or large websites. While this article isn’t a getting started guide for Flask, it will include a complete working application. Continue reading
It's funny, in my experience, OSPF is the most widely used interior gateway protocol because it “just works” and it's an IETF standard which means it inter-ops between different vendors and platforms. However, if you really start to look at how OSPF works, you realize it's actually a highly complex protocol. So on the one hand you get a protocol that likely works across your whole environment, regardless of vendor/platform, but on the other you're implementing a lot of complexity in your control plane which may not be intuitive to troubleshoot.
This post isn't a judgement about OSPF or link-state protocols in general. Instead it will detail five functional aspects of OSPF in order to reveal-at least in part-how this protocol works, and indirectly, some of the complexity lying under the hood.
If you’ve heard the buzz in the networking world lately, or if you’ve been paying attention to the back-to-back launches by Cumulus Networks as of late, then you’ve probably heard the term, “web-scale networking.” But what does that actually mean?
The term web-scale networking is inspired by data center giants like Facebook and Google. The industry looked at data centers like theirs and asked, “what are they doing that we can mimic at a smaller scale?” By analyzing these organizations and the benefits they receive from their tactics, the term “web-scale” was born. Essentially, web-scale refers to the hyperscale website companies that have built private, efficient and scalable cloud environments.
Web-scale networking is simply a modern architectural approach to infrastructure. The differentiating components are taken from the key requirements that large data center operators use to build smart networks. Businesses can design cost-effective, agile networks for the modern era by adhering to these three constructs:
These three constructs essentially comprise web-scale networking.
While compute has advanced through leaps and bounds with the convergence to private, public and hybrid clouds, networking has notoriously lagged behind. An Continue reading
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