Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Instrukcja Użytkownika Pobierz pdf (Strona 27)

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101

Exterior Gateway Protocols (BGP/EGP)

308628-14.00 Rev 00

1-7

Figure 1-3. Transit AS

In Figure 1-3, AS 20 is the transit AS. It provides information about its internal

networks, as well as transit networks, to the remaining ASs. The IBGP

connections between BGP routers A, B, and C are necessary to provide consistent

information to the ASs.

IBGP Route Reflector

A BGP router configured for IBGP must establish a peer-to-peer session with

every other IBGP speaker in the AS. In an AS with a large number of IBGP

speakers, this full-mesh topology can result in high bandwidth and maintenance

costs. For example, a full-mesh topology for an AS with 50 IBGP speakers

requires 1225 internal peer-to-peer connections.

AS 20

AS 10

AS 50

AS 11

AS 12

AS 30

IGP

BGP A

BGP B

BGP C

IP0021A

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