eBPF (which is no longer an acronym for anything), also commonly referred to as BPF, is a technology with origins in the Linux kernel

This document defines the SendHoldTimer, along with the SendHoldTimer_Expires event, for the Border Gateway Protocol (BGP)

Link-state routing protocols have hierarchical abstraction already built into them. However, when lower levels are used for transit,

Shi Shi Beach in Olympic National Park, Washington (© T.M. Schultze/TANDEM Stills + Motion)