Low Level Design – Think about the next step

A while back Greg wrote a great article about the “Rules of Design Documentation” http://etherealmind.com/rules-design-documentation-etherealmind/ these are really valuable rules when it comes to writing a design document and in my opinion is particularly relevant to a Low Level Design AKA Detailed Design Document.   Ask yourself Before you can apply these rules of design you must […]

Citrix Branch Repeater : WCCP or not to WCCP that is the question?

Whether ’tis nobler in the network to suffer un-accelerated traffic during an outage or to take arms in the form of Policy Based Routing. When you decide to†deploy†Citrix Branch Repeaters (CBR) you have to†deploy†at either end of the WAN to accelerate and compress traffic between these endpoints. Therefore it would seem sensible to have some […]

QFabric – What excites me!

I was intrigued and excited about the Junipers announcement last week of QFabric. I was vaguely aware of TRILL and Cisco implementation (Fabric Path), but came to the table (so to speak) with no pre-conceptions of what I might expect.   SCI-FI – Is this just me? Is the Q in QFabric taken from sci-fi […]

Personal Change Control

Change Control In many organisations there are processes in place to manage change, depending on the size of the organisation the change control process can be very in depth and frustrating or can be non-existent. I have experienced many people talking about change management process as if it was the root of all evil. What […]

Remote (in band) configuration tips

However working on a Global network, especially if you are making changes in-band and you don’t have the facility to access the system via a remote console or have remote power control(For people who do have such infrastructure I am insanely jealous), then you need have a few outs to keep you out of trouble. I thought I would share some useful tips that help minimise risk for you when doing remote changes.

Remembering Network Devices

A few years back when starting a new role providing 3rd Level support for an international network with over one hundred devices in my remit, it became apparent very quickly I was going to struggle to remember all the IP addresses in a few days or even the host names for that matter. There was no standard tools being use to connect all the devices, Windows XP telnet seem to be the tool of choice.

Most of the devices had some standards naming conventions. Like site code and type of device. So Lon_SW1 would be switch 1 in London. I decided to dust of my scripting skills and make life easier for myself.

Network Monitoring: SNMP knows stuff

Some packet generator are more important than others and indeed while a packet is just a packet for us network people if the packets stop moving around the network the way they should it can be a great cause for alarm. I have a customer with such a packet generating devices and it chucks out a 600k udp multicast stream (a single UDP payload) every 5 seconds and if this screws up for any reason then the application is not happy and hundreds of users are very upset. If the packets stop for any length of time then a Severity 1 incident is raised and the customer needs an ass to kick.