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.
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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.
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Izumi