Avaya Configuring IP Services Manual de usuario Pagina 263

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Configuring BGP Services
117356-A Rev. A 8-3
A BGP router employs a BGP speaker, which is an entity within the router that
transmits and receives BGP messages and acts upon them. A BGP speaker forms a
neighbor relationship with another BGP speaker by establishing a peer-to-peer
session over a common inter-AS network.
An autonomous system can include one or more BGP speakers that provide
external route information for the networks within the AS. An AS containing a
single BGP speaker with a single external BGP connection is a stub AS. The BGP
speaker provides external route information for the networks contained within its
AS only.
Bay Networks supports two versions of the Border Gateway Protocol: BGP-3 and
BGP-4.
BGP-3 assumes that each advertised network is a natural class network (A, B,
or C) based on its high-order bits. BGP-3 cannot advertise subnets or
supernets.
BGP-4 has no concept of address classes. Each network listed in the Network
Layer Reachability Information (NLRI) portion of an Update message
contains a prefix length field, which describes the length of the mask
associated with the network. This allows for both supernet and subnet
advertisement. The supernet advertisement is what makes classless
interdomain routing (CIDR) possible.
This section covers the following topics:
Topic Page
Interior BGP in Intra-AS Routing 8-4
IBGP in a Transit AS 8-4
BGP Path Attributes 8-5
BGP-4 Local Preference Values 8-7
BGP Implementation Notes 8-8
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