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.
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.
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