Re: [DNA-BOF] Detecting Network Attachment BoF description (rev 2)

[Greg Daley <greg.daley@eng.monash.edu.au>]

Hi Alper,

Alper Yegin wrote:
>>>How about we call this "Link-layer only" handover?
>>>Is there a better term?
>>
>>It is possible for multiple VLANs to be present on the same link, so
>>merely determining that the host is on the same link isn't really enough
>>to know that the address is still valid.  The issue is whether the host is
>>still on the same subnet.
> 
> 
> I thought about that case too, but I assumed change in VLAN means change in
> link. This really depends on how we define "link", and how VLAN change is
> implemented. If the host needs to re-do link attachment procedures in order
> to change its VLAN, this might as well appear as a link change.
> 
> A similar case is when the access router has multiple physical links and
> advertises a different prefix on each, although uses the same link-layer
> address and hence the same link-local IPv6 address. I think we could call
> your example "virtual link change".

I'm not sure about the term.
There's definitely a link change going on here,
even if some NIC manufacturers of devices with
VLANs share MAC addresses.
In this sense, ambiguity of v6 Link-local addresses
is something we have to be aware of.

I think it is a 'definite' link change rather
than 'virtual' :)

> Hmm, we definitely need a good terminology document here.

I agree, but do not consider this to be
you volunteering to write one...

It may be worth posting a rough work plan
for a potential working group (with conditions
based on BoF outcomes of course).

Would this be helpful?

The first thing would be a terminology
document and problem description documents.

Greg