On 27/Feb/15 10:58, Usman Latif wrote: > I think organisations that have obtained portable address ranges from > RIRs should have the liberty to use public ASNs from day one (if they > want to) regardless of whether they are single homed or multihomed. > > Also, a lot of times organisations get more than one Internet link > (for redundancy etc) from the same provider so theoretically they are > "not multihomed" as they use the same provider.
BGP does not concern itself with how many links it is running over. Networks on the Internet have no idea how many links exist between you and your service provider(s). All they see is the NLRI your network purports to originate. So really, being multi-homed has little bearing on how many links you have to one or more providers, but rather with how many different providers you share your routing policy with. In BGP's mind (and in the classic definition of multi-homing as our community understands it today), you could have 100x links to the same ISP, but to the world, you still appear to be behind a single ISP, not behind 100x links. Mark.
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