OSPF Graceful Link Shutdown
2018
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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