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Multiprotocol Extensions to BGP (RFC 2283).
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Tag unicast prefixes as multicast source prefixes for
intra-domain
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mcast routing protocols to do RPF checks.
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WHY? Allows for
interdomain RPF checking where unicast and
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multicast paths are non-congruent.
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DO I REALLY NEED IT?
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YES,
if:
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ISP to
ISP peering
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Multiple-homed
networks
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NO,
if:
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You
are single-homed
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