By default, the router that originally sourced the route into BGP places its peer address into the attribute field. The next-hop value is then typically changed when the route is transmitted across external gGP (EBGP) links. Internal BGP (IBGP) peers do not alter the next-hop value between themselves.
The next-hop attribute for a route depends on which router announces it. When a router passes route information to a peer in a different AS (using eBGP), it will generally update the next-hop attribute with its own IP address. However, by default iBGP peers will not change this attribute.
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