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How to define a document version number and refer to it anywhere in your document.

I usually place a document version number on the cover page of my article/document. Later, I may wish to use that value in say a footer or header. So many times I’ve been caught with “Version 2.1” vritten on the cover, only to find “Version 1.5” written in the footer, because I forgot to update the version number in the footer field.
Solution? There are two ways, the first involves defining a Document Property called Version, and refer to that property using the DocProperty field code, the other uses a Bookmark and refers to the bookmark in a simple formula field.

IP Pie

Dividing IP networks into subnets is as easy as pie. All you need to do is remember one simple rule about how to cut the pie.
– Every time you make a cut, you must cut the piece of pie in HALF.

Download my Guide to IP Subnetting using Pies

BGP Synchronization Example

The BGP synchronization rule states that if an AS provides transit service to another AS, BGP should not advertise a route until all of the routers within the AS have learned about the route via an IGP.

Consider the following scenario:

BGP Synchronization

Adapted from http://www.cisco.com/en/US/docs/internetworking/case/studies/icsbgp4.html

When an AS provides transit service to other ASs when there are non-BGP routers in the AS, transit traffic might be dropped if the intermediate non-BGP routers have not learned routes for that traffic via an IGP. The BGP synchronization rule states that if an AS provides transit service to another AS, BGP should not advertise a route until all of the routers within the AS have learned about the route via an IGP.

Subnetting Without Tears

Wednesday, 27 January 2010 10:07 |

Forget the bitwise operations. Here's how I do subnets. In my head! Any subnet, any mask in 30 seconds or less.

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