[rfc-dist] RFC 5171 on Cisco Systems UniDirectional Link Detection (UDLD) Protocol

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        RFC 5171

        Title:      Cisco Systems UniDirectional Link Detection 
                    (UDLD) Protocol 
        Author:     M. Foschiano
        Status:     Informational
        Date:       April 2008
        Mailbox:    foschia at cisco.com
        Pages:      13
        Characters: 28149
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-foschiano-udld-03.txt

        URL:        http://www.rfc-editor.org/rfc/rfc5171.txt

This document describes a Cisco Systems protocol that can be used to
detect and disable unidirectional Ethernet fiber or copper links
caused, for instance, by mis-wiring of fiber strands, interface
malfunctions, media converters' faults, etc.  It operates at Layer 2
in conjunction with IEEE 802.3's existing Layer 1 fault detection
mechanisms.

This document explains the protocol objectives and applications,
illustrates the specific premises the protocol was based upon, and
describes the protocol architecture and related deployment issues to
serve as a possible base for future standardization.  This memo provides 
information for the Internet community.


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