Hello Chongfeng/Authors, I understand that the problem statement that you are looking to address is to provide a connectivity service for two IPv4 hosts over a service provider network with IPv6-only underlay that uses SRv6. Is this correct?
If so, this is a solved problem and documented in RFC9252: https://www.rfc-editor.org/rfc/rfc9252.html#section-5.3 OR https://www.rfc-editor.org/rfc/rfc9252.html#section-5.1 depending on whether the service is VPN or Internet connectivity. Note that this uses End.DT4 (or other similar) SIDs defined in RFC8986 This solution builds on BGP RFC 5549/8950 which allows signaling of IPv4 prefixes using IPv6 BGP NHs. We can meet offline in Prague if you would like to discuss further. Thanks, Ketan
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