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Configuring IP Services

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303528-A Rev 00

Interior BGP Routing

Bay Networks implements Interior BGP (IBGP) intra-AS routing. Under IBGP,

each router in the AS runs an interior gateway protocol (IGP) for internal routing

updates and also maintains an IBGP connection to each BGP border router. The

IBGP information is used in conjunction with the IGP route to the authoring BGP

border router to determine the next hop to use for external networks.

No BGP information is carried by the IGP. Each router uses IBGP exclusively to

determine reachability to external networks. When an IBGP update for a network

is received, it can be passed on to IP for inclusion in the routing table only if a

viable IGP route to the correct border gateway is available.

An AS with more than one BGP speaker can use IBGP to provide a transit service

for networks outside the AS. An AS that provides such a service for BGP speakers

is known as a transit AS (Figure 8-2).

Figure 8-2. Transit Autonomous System (AS)

AS 20

AS 10

AS 50

AS 11

AS 12

AS 30

IGP

BGP A

BGP B

BGP C

IP0021A

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