Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur Page 152

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Configuring IP Exterior Gateway Protocols (BGP and EGP)
7-2
308628-15.0 Rev 00
Figure 7-1. BGP/OSPF Autonomous System
Assume for this example that OSPF is configured throughout the AS to support
ECMP routes, and that all links in the AS have the same cost. This means that the
IP routing table on router F includes two ECMP routes to router A. One route uses
interface 1; the other route uses interface 4.
Assume as well that the BGP speakers on routers A, B, and F have established a
full mesh of IBGP peer-to-peer sessions with each other, using routers C,
D, and E.
IP0089B
1
1
2
2
1
2
2
3
4
23
3
33
1
1
Key
A
B
AS
ECMP OSPF routes from
router F to router A
D
EC
F
OSPF
BGP
OSPF
OSPF
OSPF
OSPF
BGP
OSPF
BGP
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