
BGP and BGP4+ Introduction
Term
CIDR
Description
Classless
| External BGP (eBGP) | Refers to how a router views a BGP peer relationship, where the |
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| peer is in another AS (Autonomous System). See also Internal |
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| BGP (iBGP), where the peer is in the same AS. |
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| Interior Gateway | A routing protocol designed to be used to exchange routing |
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| Protocol (IGP) | information inside a single autonomous system. |
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| Internal BGP (iBGP) | A characteristic of a BGP neighbor relationship, specifically |
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| when the two routers are internal to the same BGP ASN. |
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| neighbor | Another router with which a router decides to exchange routing |
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| information. |
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| Neighbor Type | Either external BGP (eBGP), confederation eBGP, or internal BGP |
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| (iBGP). The term refers to a peer connection and whether the |
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| peers are in different ASs (eBGP), different confederation |
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| systems (confederation eBGP), or in the same AS (iBGP). |
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| Next Hop field | With a routing update, or routing table entry, the portion of a |
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| route that defines the next router to which a packet should be |
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| sent to reach the destination subnet. With routing protocols, the |
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| Next Hop field may define a router other than the router |
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| sending the routing update. |
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| A BGP configuration setting that tells the local router to change |
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| the NEXT_HOP path attribute to refer to its own BGP Update |
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| Source when advertising routes to BGP neighbors. |
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| path control | A general term, that refers to any function that impacts how |
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| routers forward packets. These functions include routing |
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| protocols and any other feature that impacts the IP routing |
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| table, plus any feature that impacts the packet forwarding |
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| process. |
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| private AS | BGP ASN whose value is between 64,512 and 65,535. These |
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| values are not assigned for use on the Internet and can be used |
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| for private purposes, typically either within confederations or by |
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| ISPs to hide the ASN used by some customers. |
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| A private ASN | An Autonomous System Number (ASN) that falls inside the |
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| Private AS range. |
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| public ASN | An ASN that fits below the private ASN range, specifically from 1 |
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| through 54,511 with a |
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| 1 through 4,294,967,295. |
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| redistribution | The process on a router of taking the routes from the IP routing |
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| table, as learned by one routing protocol, and injecting routes |
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| for those same subnets into another routing protocol. |
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| regular expression | A list of interspersed alphanumeric literals and metacharacters |
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| used to apply complex matching logic to alphanumeric strings. |
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| Often used for matching AS_Paths. |
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| Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches |
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AlliedWare PlusTM Operating System - Software Version | 1.43 |
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