Robert Raszuk wrote on 09/10/2021 22:25:
What really matters to me is that SRv6 packets can be forwarded by not SR aware IPv6 network elements with no change to data plane and control plane required. That's it - no more - no less.
Andrew Alston's email indicates that there is at least one existing ipv6 network deployment where this is not the case. It is unlikely that this is an isolated example: there's no shortage of brownfield ipv6 deployments on the internet.
As a general comment, protocol specification is about ensuring wide-scale interoperability, so redefining well-known semantic constructions is something that's likely to cause difficulties. The lower in the stack you go, the more likely you are to run into problems.
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