RFC 4812 on OSPF Restart Signaling

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        RFC 4812

        Title:      OSPF Restart Signaling 
        Author:     L. Nguyen, A. Roy,
                    A. Zinin
        Status:     Informational
        Date:       March 2007
        Mailbox:    lhnguyen@cisco.com, 
                    akr@cisco.com, 
                    alex.zinin@alcatel-lucent.com
        Pages:      7
        Characters: 12111
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-nguyen-ospf-restart-06.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4812.txt

OSPF is a link-state intra-domain routing protocol used in
IP networks.  Routers find new and detect unreachable neighbors via
the Hello subprotocol.  Hello OSPF packets are also used to ensure
two-way connectivity within time.  When a router restarts its OSPF
software, it may not know its neighbors.  If such a router sends a
Hello packet on an interface, its neighbors are going to reset the
adjacency, which may not be desirable in certain conditions.

This memo describes a vendor-specific mechanism that allows OSPF
routers to inform their neighbors about the restart process.  Note
that this mechanism requires support from neighboring routers.  The
mechanism described in this document was proposed before Graceful
OSPF Restart, as described in RFC 3623, came into existence.  It is
implemented/supported by at least one major vendor and is currently 
deployed in the field.  The purpose of this document is to capture the
details of this mechanism for public use.  This mechanism is not an IETF
standard.  This memo provides information for the Internet community.

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