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Why is EXOS including the Local Link Address as next-hop in a bgp update ?

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TitleWhy is EXOS including the Local Link Address as next-hop in a bgp update ?
Question
Why is EXOS including the Local Link Address as next-hop in a bgp update ?
Environment
EXOS
BGP 
ipv6
 
Answer
According to RFC 2545 (https://tools.ietf.org/html/rfc2545) a BGP update can include the Link Local Address next to the global address is they share a common subnet.

Quote from the RFC
The link-local address shall be included in the Next Hop field if and
only if the BGP speaker shares a common subnet with the entity
identified by the global IPv6 address carried in the Network Address
of Next Hop field and the peer the route is being advertised to.
Additional notes

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