No Accident BGP is used for VPNs

Border Gateway Protocol (BGP) is used in many roles. So many, that some worry about the impact on Internet stability. The distribution of flowspec rules by BGP that was implicated in the recent Centurylink outage was a reminder to some of that potential, notwithstanding a hopefully fully understanding of the outage in the future. Most…

You cannot eliminate complexity for the SAME capability & certainty

The common saying in networking “you cannot eliminate complexity, you can only move it around” are words to live by. Providing insight into the combinatorial complexity in engineering tradeoffs. I find it useful to think about the issue in a slightly modified way “You cannot eliminate complexity for the SAME capability (& certainty)”. Information theory points…

BGP for Service Layer Migration and Perhaps More

The Important Over the next five years (Network 2025), migration will be top of mind for IP Architects and Engineers, as many networks transition to Segment Routing (SR) for MPLS (SR MPLS), Segment Routing for IPv6 (SRv6), IPv6 (without segment routing), and other migration scenarios in between. BGP-based VPNs support numerous forwarding/data planes, enabling the…