Chapter 12: BGP Configuration Guide

The configuration for router C1 (a Cisco router) is as follows:

router bgp 1

no synchronization

network 16.122.128.0 mask 255.255.255.0 network 17.122.128.0 mask 255.255.255.0 neighbor 16.122.128.1 remote-as 1 neighbor 16.122.128.1 next-hop-self

neighbor 16.122.128.1 soft-reconfiguration inbound neighbor 16.122.128.2 remote-as 1

neighbor 16.122.128.2 next-hop-self

neighbor 16.122.128.2 soft-reconfiguration inbound neighbor 16.122.128.9 remote-as 1

neighbor 16.122.128.9 next-hop-self

neighbor 16.122.128.9 soft-reconfiguration inbound neighbor 18.122.128.4 remote-as 4

The configuration for router C2 (a Cisco router) is as follows:

router bgp 1

no synchronization

network 16.122.128.0 mask 255.255.255.0 network 17.122.128.0 mask 255.255.255.0 neighbor 14.122.128.5 remote-as 5 neighbor 16.122.128.1 remote-as 1 neighbor 16.122.128.1 next-hop-self

neighbor 16.122.128.1 soft-reconfiguration inbound neighbor 16.122.128.2 remote-as 1

neighbor 16.122.128.2 next-hop-self

neighbor 16.122.128.2 soft-reconfiguration inbound neighbor 16.122.128.8 remote-as 1

neighbor 16.122.128.8 next-hop-self

neighbor 16.122.128.8 soft-reconfiguration inbound

EBGP Multihop Configuration Example

EBGP Multihop refers to a configuration where external BGP neighbors are not connected to the same subnet. Such neighbors are logically, but not physically connected. For example, BGP can be run between external neighbors across non-BGP routers. Some additional configuration is required to indicate that the external peers are not physically attached.

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SmartSwitch Router User Reference Manual

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Cabletron Systems 9032578-05 Ebgp Multihop Configuration Example, Configuration for router C1 a Cisco router is as follows