Avaya Configuring IP Services Manual do Utilizador descarregar pdf (Página 265)

100

101

Configuring BGP Services

117356-B Rev. 00

8-5

In Figure 8-2, 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 Server

A BGP router configured for internal BGP (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 1,225 internal peer-to-peer connections.

To avoid the high costs of a full-mesh topology to support IBGP speakers within

an AS, you can configure a router to function as an

IBGP route server

. IBGP

speakers that need to communicate with other BGP speakers in the AS establish a

single peer-to-peer session with the IBGP route server.

Figure 8-3

, for example, shows an AS with five IBGP speakers connected as

clients to an IBGP route server

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