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Withdrawn routes provide a list of
routing updates that are no longer reachable and need to be
withdrawn (removed) from the BGP routing table; withdrawn routes
have the same format as NLRIs.
The length is the total length, in bytes, of the withdrawn
routes; an length of 0 indicates that no routes are to be withdrawn.
An UPDATE message that has no NLRI or path attribute information is
used to advertise only routes to be withdrawn from service.
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