Allied Telesis VERSION 5.4.3-2.6, BGP4 manual Term

BGP and BGP4+ Introduction

Term

CIDR

Description

Classless Inter-Domain Routing. A routing method supported by BGP that is based on route aggregation. CIDR allows router to group routes together to cut down on the amount of routing information carried by routers. Several IP networks appear as a single network to networks outside of those grouped together.

	External BGP (eBGP)	Refers to how a router views a BGP peer relationship, where the
		peer is in another AS (Autonomous System). See also Internal
		BGP (iBGP), where the peer is in the same AS.
	Interior Gateway	A routing protocol designed to be used to exchange routing
	Protocol (IGP)	information inside a single autonomous system.
	Internal BGP (iBGP)	A characteristic of a BGP neighbor relationship, specifically
		when the two routers are internal to the same BGP ASN.
	neighbor	Another router with which a router decides to exchange routing
		information.
	Neighbor Type	Either external BGP (eBGP), confederation eBGP, or internal BGP
		(iBGP). The term refers to a peer connection and whether the
		peers are in different ASs (eBGP), different confederation
		systems (confederation eBGP), or in the same AS (iBGP).
	Next Hop field	With a routing update, or routing table entry, the portion of a
		route that defines the next router to which a packet should be
		sent to reach the destination subnet. With routing protocols, the
		Next Hop field may define a router other than the router
		sending the routing update.
	Next-hop self	A BGP configuration setting that tells the local router to change
		the NEXT_HOP path attribute to refer to its own BGP Update
		Source when advertising routes to BGP neighbors.
	path control	A general term, that refers to any function that impacts how
		routers forward packets. These functions include routing
		protocols and any other feature that impacts the IP routing
		table, plus any feature that impacts the packet forwarding
		process.
	private AS	BGP ASN whose value is between 64,512 and 65,535. These
		values are not assigned for use on the Internet and can be used
		for private purposes, typically either within confederations or by
		ISPs to hide the ASN used by some customers.
	A private ASN	An Autonomous System Number (ASN) that falls inside the
		Private AS range.
	public ASN	An ASN that fits below the private ASN range, specifically from 1
		through 54,511 with a 16-bit ASN. With a 32-bit ASN the range is
		1 through 4,294,967,295.
	redistribution	The process on a router of taking the routes from the IP routing
		table, as learned by one routing protocol, and injecting routes
		for those same subnets into another routing protocol.
	regular expression	A list of interspersed alphanumeric literals and metacharacters
		used to apply complex matching logic to alphanumeric strings.
		Often used for matching AS_Paths.
	Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
C613-50032-01 REV D	AlliedWare PlusTM Operating System - Software Version 5.4.3-2.6		1.43