> I do not understand the meaning of "next-hop" TLV for a subsequent Update.
[...]
> What should I do put the route's next-hop into update messages?
1. For an IPv6 route, do not send a Next Hop TLV. In its absence, the
receiver will derive the next hop address from the IPv6 packet's source
address.
α β
A ------- B
Node A has IPv6 address α. It sends an Update to B in an IPv6 address
with source address α. B uses α as the route's next hop.
2. For an IPv4 route, precede the Update with a Next Hop TLV with the
on-link address of the sending node. The receiver will use this
address as the route's next-hop.
α β
A ------- B
ℵ ℶ
Node A has IPv6 address α and IPv4 address ℵ (that's "aleph"). It
sends an IPv4 Update to B, with source address α. Since the route
requires an IPv4 next hop, B needs to learn ℵ somehow — so it consults
the preceding Next Hop packet, which contains ℵ.
— Juliusz
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