Jeff, this was brought up a few months ago (see Juergen's response):
https://mailarchive.ietf.org/arch/msg/netmod/cRmDwqarkW2fNc2nS25zrkycQWs/
On Thursday, January 6, 2022, 04:54:22 PM EST, Jeffrey Haas
<[email protected]> wrote:
Mahesh suggested I send this suggestion here.
Several IPv6 routing protocols have circumstances where the only acceptable
address is an ipv6 link-local address.
The YANG type we have for ipv6 can accommodate ipv6 link local addresses,
however it's overly permissive for some use cases.
Has the Working Group considered adding a typedef for ipv6 link-local?
FWIW, the current use case under consideration is operational state for BGP
IPv6 routes conforming to RFC 2545 and related work under consideration in IDR
for link-local only BGP peering. In such circumstances, the BGP nexthop will
contain a component that may only be ipv6 link-local.
For the BGP YANG module, the edits under consideration will currently use the
ipv6 type. Since the current use case is operational only state, the lack of
the more restrictive type is not considered a blocker. For the future
link-local-only work, configuration state will be needed.
-- Jeff
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