RFC 3627 on Use of /127 Prefix Length Between Routers Considered Harmful

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        RFC 3627

        Title:      Use of /127 Prefix Length Between Routers
                    Considered Harmful
        Author(s):  P. Savola
        Status:     Informational
        Date:       September 2003
        Mailbox:    psavola@funet.fi
        Pages:      6
        Characters: 12436
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-savola-ipv6-127-prefixlen-04.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3627.txt


In some cases, the operational decision may be to use IPv6 /127
prefix lengths, especially on point-to-point links between routers.
Under certain situations, this may lead to one router claiming both
addresses due to subnet-router anycast being implemented.  This
document discusses the issue and offers a couple of solutions to the
problem; nevertheless, /127 should be avoided between two routers.

This memo provides information for the Internet community.  It does
not specify an Internet standard of any kind.  Distribution of this
memo is unlimited.

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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

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