This peering configuration is the reverse version of the previous one. So the configuration-wise, it is very similar.
The benefit is clear, we only need 1 BGP peering to carry both address families. But we still need to keep a dual stack on the interfaces to be used as NH. In today data center network, ECMP is very popular and wide. Evening using /31, the finest network mask, a /24 can only afford 128 links.
And this youtube explains very well on the requirement behind RFC 5549, ipv4 over v6 NH, which is shown in the next blog
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