4 posts
A practical guide to reading BGP looking glass output — how to interpret the AS path, origin AS, next hop, RPKI status, and route collectors, and how to use a looking glass to diagnose reachability problems, suboptimal routing, and hijacks.
Everything you need to know about Autonomous System Numbers — what an AS is, the difference between public and private ASNs, how they work in BGP, 2-byte vs 4-byte ASNs, how to look one up, and the process for getting your own.
A deep dive into Bidirectional Forwarding Detection — why BGP's default failure detection is dangerously slow, how BFD provides sub-second link failure detection, and how to configure it on Cisco IOS-XE, IOS-XR, and NX-OS.
BGP was built for trust, not security. RPKI fixes that by cryptographically validating route origins — here's how to deploy it on Cisco IOS-XE, IOS-XR, and NX-OS.
