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BGP and BGP4+ Introduction
Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
C613-50032-01 REV D AlliedWare Plus
TM
Operating System - Software Version 5.4.3-2.6 1.43
CIDR
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
Protocol (IGP)
A routing protocol designed to be used to exchange routing
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.
Term Description