Re: [RAM] Re: Ramblings about "locator"

[RJ Atkinson <rja at extremenetworks.com>]

On  14 Jun 2007, at 13:25, Dino Farinacci wrote:
> I disagree. I think it is just as overloaded as an IP address.

My previous postings have said that things with overloaded
semantics (location sometimes, identity other times) are
called "addresses".

> MAC addresses are used as serial numbers in many products. That is  
> an ID if I ever thought there was one. And a MAC address is  
> certainly used to find (that means "where", and "where" means  
> location) an ethernet attached station in a L2 switched network.

Right.  Using my terminology proposal, that makes them "addresses"
(i.e. objects with mixed semantics, depending on use).

> And what about how MAC addresses are used in IS-IS and in IPv6  
> stateless auto-configuration. In these cases, it's purely an ID.
>
> And for the old guys, remember OSI and what an L1 area in IS-IS was  
> used for? To route system-ids which were based on MAC addresses. So  
> in this case, the MAC was a locator.

So we agree, a MAC is an address -- hence has mixed semantics:
sometimes is used for identity and other times used for location.

Ran


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