On 2015/02/27 18:16, Mark Tinka wrote: > 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. >
Indeed. If we look at the definition of multihoming on APNIC Guangliang have shared on this mailing list, it doesn't specify how many links and it defines criteria based on ASNs. ---- http://www.apnic.net/policy/asn-policy#3.4 3.4 Multihomed A multi-homed AS is one which is connected to more than one other AS. An AS also qualifies as multihomed if it is connected to a public Internet Exchange Point. In the ASN request form, you will be asked to provide the estimate ASN implementation date, two peer AS numbers and their contact details. It is also acceptable if your network only connect to an IXP. ---- Izumi * sig-policy: APNIC SIG on resource management policy * _______________________________________________ sig-policy mailing list sig-policy@lists.apnic.net http://mailman.apnic.net/mailman/listinfo/sig-policy
