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

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)

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