I-D ACTION:draft-bashandy-idr-bgp-repair-label-02.txt

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    Title         : Scalable, Loop-Free BGP FRR using Repair Label
    Author(s)     : A. Bashandy, et al
    Filename      : draft-bashandy-idr-bgp-repair-label-02.txt
    Pages         : 14
    Date          : 2011-07-11
    
Consider a BGP free core scenario. Suppose the provider edge BGP
speakers PE1, PE2,..., PEn know about a prefix P/p via the external
routers CE1, CE2,..., CEm.  If the PE router PEi loses connectivity to
the primary path, whether it is another PE router or a CE router, it is
desirable to immediately restore traffic by rerouting packets arriving
to PEi and destined to the prefix P/p to one of the other PE routers
that advertised P/p, say PEj, until BGP re-converges. However if the
loss of connectivity of PEi to the primary path also resulted in the
loss of connectivity between PEj and CEj, rerouting a packet before the
control plane converges may result in a loop. In this document, we
propose using a repair label for traffic restoration while avoiding
loops. We propose advertising the ''repair'' label through BGP.


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