When writing python modules it is useful to ensure the help function in Python can add some value For exmaple if you go to the Python interperator and issue the help function on the module you will get usful output; 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 …

I decided to get familiar with Python so thought I would start sharing my notes. I have done some scripting in the past to help me get things done quicker, eliminate doing the same task multiple times and to manipulate data, most of this was done using Perl (and a few years back when I was focused …

I thought the Wikipedia definition of JSON gave a good description so thought I would quote its introduction. The official pages that go into much more detail can be found at www.json.org. JSON or JavaScript Object Notation, is an open standard format that uses human-readable text to transmit data …

So what is a cloud and what does it mean to us networking people? The term cloud has been thrown around for a number of years now and im not sure people have the same definition (and its fast evolving), personally im not a massive fan of the term. According to NIST a number of service models exist; …

The Nexus 7000 and 5000 series switches take port-channel functionality to the next level by allowing Muli-Chassis port aggregation. It was introduced in version 4.1(4). Port-channels configured as vPC can only be used as L2 links and no dynamic routing protocol should be used across the link. vPCs …

The Nexus 7000 supports VDC. VDC allows the partitioning of a single physical device into multiple logical devices.The logical separation provides the following benefits; Admin and management separation Change and failure domain isolation from other VDC Address, VLAN, VRF and vPC isolation Each VDC …

Overlay Transport Virtulisation (OTV) is currently a feature on the Nexus 7000 product (M1 modules) range that provides DCI (Data Center Interconnect). It allows multiple data centers to be linked together and extends L2 Ethernet across them. OTV is different to EoMPLS & VPLS as a LAN extension …

I probably should have made notes on the Cisco Nexus platform and its features when I first started playing with them back in 2010/2011, it would have saved me running over it again and making new notes. Although quite a few new features have been introduced since then Key Features of the NXOS; VDC …

Network statement does not control what networks are being advertised but instead what interfaces are running EIGRP process Uses protocol number 88 Multicast to 224.0.0.10 (TTL=0) Receiving neighbour unicasts are acknowledged Unequal cost load sharing of up to 16 links EIGRP does not form neighbours …

In a small hub and spoke (where spokes are stubs) you could use On Demand Routing (ODR) to achieve full readability between sites. ODR uses CDP as its transport . CDP versions must match. ODR will auto-inject a default route in the spoke routers and the spoke routers will advertise their directly …