Thanks, Brian. Looks like a good reference. Alas a longer read ;-)
Definitions seem to be agreeable. Except that "node" is overloaded across
different RFCs. We used it instead of router/switch in ANIMA. I guess
i would now use "logical entity" for what rfc6115 calls logical node.
Cheers
Toerless
On Sat, Mar 05, 2022 at 08:57:36AM +1300, Brian E Carpenter wrote:
> Toerless,
>
> I believe the closest we ever got to agreed definitions was in the
> IRTF RFC 6115:
>
> 6. A "locator" is a structured topology-dependent name that is not
> used for node identification and is not a path. Two related
> meanings are current, depending on the class of things being
> named:
>
> 1. The topology-dependent name of a node's interface.
>
> 2. The topology-dependent name of a single subnetwork OR
> topology-dependent name of a group of related subnetworks
> that share a single aggregate. An IP routing prefix is a
> current example of the latter.
>
> 7. An "identifier" is a topology-independent name for a logical
> node. Depending upon instantiation, a "logical node" might be a
> single physical device, a cluster of devices acting as a single
> node, or a single virtual partition of a single physical device.
> An OSI End System Identifier (ESID) is an example of an
> identifier. A Fully Qualified Domain Name (FQDN) that precisely
> names one logical node is another example. (Note well that not
> all FQDNs meet this definition.)
>
> Regards
> Brian
>
> On 05-Mar-22 00:39, Toerless Eckert wrote:
> > On Thu, Mar 03, 2022 at 09:28:23AM -0800, Dino Farinacci wrote:
> > > > of its address structure helps the underlay to locate the entity (xTR)
> > > > that the
> > > > address is assigned to (xTR). So the name 'locator' is 'just' a good
> > > > name for what LISP calls/uses the address for, not for how the under
> > > > itself would maybe call the address or use the address for.
> > >
> > > Well the locator you put in an outer header destination address is
> > > called/used/assign to whatever the rules of the underlay are. If the
> > > underlay is ethernet, then its a 6-byte address where the high-order 3
> > > bytes is an organizational ID, just to cite an example.
> >
> > Indeed.
> >
> > I have not seen an answer to the question i posed earlier in the thread:
> > whether and if so what general (not technology specific) definition of
> > locator
> > and identifier the IETF may have. But i have seen a lot of confusion about
> > it and people shying away from using these terms.
> >
> > If (as i think) we do not have a commonly applicable definition of
> > locator/identifier
> > (beyond its use in indivdual technologies like LISP), then i think this is
> > because
> > folks who tried to apply these terms (incorrectly) may have failed to
> > see the difference between what an address is and what someone (like an
> > application) calls it (/uses it for). In that respect the reference to
> > the White Knight in IEN19 is very helpful to remember.
> >
> > Cheers
> > Toerless
> >
> > > Dino
> >
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