bgp – security without obscurity

Abstraction, Layering, and a little Anycast

Ok, so the post from yesterday asked you to look at a diagram and determine where a packet would route and why it might take that path. Hopefully some of you have had a chance to lab it up to test any theories you have. Even if you haven’t we can still have a lookContinue reading “Abstraction, Layering, and a little Anycast”

IP Routing: Aggregation Concepts and Techniques

Purpose of route aggregation Scalability and fault isolation How to Aggregate What is the purpose of route aggregation? We aggregate routes to decrease the sizes of our routing tables, hide information, and decrease convergence times. The boundary device – ASBR / ABR / whatever – will use a route summarization technique to aggregate prefixes towardsContinue reading “IP Routing: Aggregation Concepts and Techniques”

MPLS notes

I took a class this past week for some more formalized MPLS training. I will be posting some notes to remind myself of key ideas. There are a few key take-aways that helped me understand the how and why of MPLS. I knew the basics, like how MPLS uses ‘tags’ instead of layer 3 addressesContinue reading “MPLS notes”