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This draft is a work item of the Open Shortest Path First IGP WG of the IETF.

        Title           : OSPF Graceful Link shutdown
        Authors         : Shraddha Hegde
                          Pushpasis Sarkar
                          Hannes Gredler
                          Mohan Nanduri
                          Luay Jalil
        Filename        : draft-ietf-ospf-link-overload-16.txt
        Pages           : 17
        Date            : 2018-02-04

   When a link is being prepared to be taken out of service, the traffic
   needs to be diverted from both ends of the link.  Increasing the
   metric to the highest value on one side of the link is not sufficient
   to divert the traffic flowing in the other direction.

   It is useful for the routers in an OSPFv2 or OSPFv3 routing domain to
   be able to advertise a link as being in a graceful-shutdown state to
   indicate impending maintenance activity on the link.  This
   information can be used by the network devices to re-route the
   traffic effectively.

   This document describes the protocol extensions to disseminate
   graceful-link-shutdown information in OSPFv2 and OSPFv3.

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