The Nexthop Attribute

• If the advertising router and the receiving router are internal peers and the NLRI of the update refers to a destination in a different AS, the NEXT_HOP is the IP address of the external peer from which the route was learned.

Figure 2-23 illustrates the first rule. Here, the advertising router and receiving router are in different autonomous systems. The NEXT_HOP is the interface address of the external peer. So far, this behavior is the same as would be expected of any routing protocol.

flyuro 2-23 If a BGP Update Is Advertised via EBGP, the NEXT_HOP Attribute Is the IP Address of the External Peer flyuro 2-23 If a BGP Update Is Advertised via EBGP, the NEXT_HOP Attribute Is the IP Address of the External Peer

Figure 2-24 illustrates the second rule. This time, the advertising router and the receiving router are in the same AS, and the destination being advertised is also in the AS. The NEXT_HOP associated with the NLRI is the IP address of the originating router.

Figure 2-24 If a BGP Update Is Advertised via IBGP, and the Advertised Destination Is in the Same AS, the NEXT_HOP Attribute Is the IP Address of the Originating Router

172.16.83.2

172.16.83.1

172.16.101.1

172.16.101.2

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