THIS IS NOT TRUE IF THE NEXT HOP IS ON A MULTIACCESS MEDIA, IN WHICH...
1.This is not true if the next hop is on a multiaccess media, in which case the nexthop will be the ip
address of the router that is closest to the destination. This is described in the following sections.
Example:
RTA#
router bgp 100
neighbor 170.10.20.2 remote-as 300
neighbor 150.10.50.1 remote-as 100
network 150.10.0.0
RTB#
neighbor 150.10.30.1 remote-as 100
RTC#
router bgp 300
neighbor 170.10.20.1 remote-as 100
network 170.10.0.0
*RTC will advertise 170.10.0.0 to RTA with a NextHop = 170.10.20.2
*RTA will advertise 170.10.0.0 to RTB with a NextHop=170.10.20.2
(The external NextHop via EBGP is sent via IBGP)
Special care should be taken when dealing with multiaccess and NBMA
networks as described in the following sections.