ISP Network Design

I have been reading recently quite a bit in regards to ISP core network designs and quickly realised that ISP network design is a serious undertaking indeed. In this blog, I wanted to add some structure to notes I have been taking for the past few days on this topic.

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BGP Attributes and BGP Path Selection

In this blog I will briefly review the BGP path selection algorithm used when deciding which BGP routes to install in the routing table. Though before doing so, I ought to review first the BGP attributes. BGP ATTRIBUTES TYPES Firstly, we classify BGP attributes based on whether or not they should be supported within a specific vendor BGP implementation. Well-Known BGP attributes are supported in all BGP implementation regardless the vendor. Depending on whether or not these are sent with BGP Updates, we further classify them into: Mandatory attributes – these must be present in every single update where NLRIs…

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