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BGP Terms
03/26/2020 
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DESCRIPTION:
BGP Terms
RESOLUTION:
This article provides an overview of commonly used BGP-related terms and abbrivations.
ARD – Autonomous Routing Domain – A collection of networks/routers that have a common administrative routing policy.
AS - Autonomous System – An ARD that has been assigned an identifying number, typically running BGP4 at its border router(s).
BGP4 - Border Gateway Protocol 4: The most prevalent EGP.
CIDR – Classless inter-domain routing, enables efficient route advertisement through route aggregation.
CPE – Customer Premise Equipment - The equipment at the edge of a customer's network used to interface with the ISP.
EGP - Exterior Gateway Protocol – Any protocol (in practice, BGP4) used to communicate routing information between Autonomous Systems.
Full-Routes - The entire global BGP route table.
FIB - Forwarding Information Base – Our existing route table, used to find the egress interface and next hop when forwarding packets.
Looking Glass* - A Looking Glass (LG) server is a read-only view of routers of organizations running the LG servers. Typically, publicly accessible looking glass servers are run by ISPs or NOCs.
Multi-Homed - An ISP customer that has multiple connections to one or more ISPs.
Multi-Provider - An ISP customer that uses multiple ISPs to connect to the Internet.
NSM (Network Services Module) - The ZebOS component that centralizes the interface to the FIB and RIB. The separate routing protocol daemons interface with the NSM for all RIB updates. NSM alone updates the FIB with best-route information from the RIB.
Partial Routes - A subset of the full BGP route table, usually specific to destinations that are part of an ISP's domain.
RIB (Route Information Base) – A run-time database owned by the NSM, and used to store all route information gathered and used by the routing protocols.
