Reshad,

Thanks for drawing my attention to this older thread.

It seems the method for addressing the need is understood.  I guess my request 
is to urge Jürgen and the WG to reconsider its avoidance of providing us a 
common type.  Not having multiple people reinvent this particular thing each 
time seems productive.

-- Jeff


> On Jan 6, 2022, at 5:02 PM, Reshad Rahman <[email protected]> wrote:
> 
> Jeff, this was brought up a few months ago (see Juergen's response): 
> https://mailarchive.ietf.org/arch/msg/netmod/cRmDwqarkW2fNc2nS25zrkycQWs/ 
> <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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