RFC 3509 on Alternative Implementations of OSPF Area Border Routers

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        RFC 3509

        Title:      Alternative Implementations of OSPF Area Border
                    Routers
        Author(s):  A. Zinin, A. Lindem, D. Yeung
        Status:     Informational
        Date:       April 2003
        Mailbox:    zinin@psg.com, acee@redback.com,
                    myeung@procket.com
        Pages:      12
        Characters: 24326
        Updates/Obsoletes/SeeAlso:  None

        I-D Tag:    draft-ietf-ospf-abr-alt-05.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3509.txt


Open Shortest Path First (OSPF) is a link-state intra-domain routing
protocol used for routing in IP networks.  Though the definition of
the Area Border Router (ABR) in the OSPF specification does not
require a router with multiple attached areas to have a backbone
connection, it is actually necessary to provide successful routing to
the inter-area and external destinations.  If this requirement is not
met, all traffic destined for the areas not connected to such an ABR
or out of the OSPF domain, is dropped.  This document describes
alternative ABR behaviors implemented in Cisco and IBM routers.

This document is a product of the Open Shortest Path First IGP Working
Group of the IETF.

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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