Loop-free convergence using oFIB
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This draft describes a mechanism for use in conjunction with link
state routing protocols which prevents the transient loops which would
otherwise occur during topology changes. It does this by correctly
sequencing the FIB updates on the routers. This mechanism can be used
in the case of non-urgent link or node shutdowns and restarts or link
metric changes. It can also be used in conjunction with a FRR
mechanism which converts a sudden link or node failure into a non-
urgent topology change. This is possible where a complete repair path
is provided for all affected destinations. After a non-urgent
topology change, each router computes a rank that defines the time at
which it can safely update its FIB. A method for accelerating this
loop-free convergence process by the use of completion messages is
also described.