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[dpd-api] correct external multicast group scope docs - #365

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zeeshanlakhani wants to merge 1 commit into
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[dpd-api] correct external multicast group scope docs#365
zeeshanlakhani wants to merge 1 commit into
zl/mcast-validationfrom
zl/mcast-external-doc

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@zeeshanlakhani

@zeeshanlakhani zeeshanlakhani commented Sep 2, 2026

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Both external group endpoints describe themselves as serving "IPv4 and non-admin-local IPv6 multicast traffic", which our validation contarct contradicts. This adds validate_not_underlay_subnet, which accepts admin-local addresses and refuses only the reserved underlay subnet ff04::/64.

Previous documentation was blessed, so, here, we are correcting it with a new version. MCAST_EXTERNAL_SCOPE_DOCS carries the corrected wording on the POST and the PUT, while version-bounded copies preserve the original text for everything before it.

Both external group endpoints describe themselves as serving "IPv4 and
non-admin-local IPv6 multicast traffic", which the validator contradicts:
`validate_not_underlay_subnet` accepts admin-local addresses and refuses
only the reserved underlay subnet ff04::/64.

Description text belongs to a blessed document, so correcting it takes a
new version rather than an edit. `MCAST_EXTERNAL_SCOPE_DOCS` carries the
corrected wording on the POST and the PUT, while version-bounded copies
preserve the original text for everything before it.
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