Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario descargar pdf (Pagina 158)

Configuring IP Exterior Gateway Protocols (BGP and EGP)

9-6

308628-14.00 Rev 00

• The EBGP speaker on the local router and the EBGP speaker on the remote

router must establish a peer-to-peer session using their circuitless IP

interfaces. For information, see Chapter 6, “Establishing a Peer-to-Peer

Session.”

• The local IP routing table must contain multiple equal-cost routes to the

circuitless interface of the router in the remote AS. These ECMP routes are

typically submitted statically, but they could also be submitted by OSPF or

RIP.

In Figure 9-4

, for example, two BGP routers located in different ASs are

connected by two physical links.

Figure 9-4. ECMP Static Routes

Assume that the IP routing table in the BGP router in AS 1 contains two ECMP

static routes to the circuitless interface of the BGP router in AS 2. One ECMP

route uses interface 1; the other route uses interface 2.

Assume also that the two EBGP speakers have established a peer-to-peer session,

using their circuitless IP interfaces.

IP0090A

Local AS Remote AS

EBGPEBGP

IP circuitless interface

Peer-to-Peer Session

Key

ECMP static routes

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario Pagina 158