Re: [6tisch] CoAP resource management - draft-ietf-6tisch-coap-02

Version numbers often don’t work very well.
They may look like cheap insurance, but in the end they don’t buy much.
E.g. simply incrementing them suddenly makes you incommunicado with older devices.

Not having looked at the details, I cannot recommend something specific, but maybe e.g. look at the capability indication in draft-ietf-6lo-ghc as a very soft alternative to version numbers.

Grüße, Carsten

> On 11 Nov 2014, at 11:03, Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:
> 
> Michael
> I believe ³version data² may be a misleading word I used in the previous
> email. What I meant is the version number.
> 
> The version number uniquely identifies the set of 6top resources that can
> be accessed on a node. Version number is bumped up when a resource is
> added, renamed or deleted.
> 
> Heterogenity may arise when new nodes (running an updated implementation
> which may have added a new resources) are added to existing deployments.
> Heterogenity is entirely w.r.t the version number (and consequently the
> set of 6top resources that can be accessed on the nodes).
> 
> This is important for both the PCE as well as peer nodes to identify what
> information they access on a 6top node.
> 
> -raghuram
> 
> On 11/11/14, 12:31 PM, "Michael Richardson" <mcr+ietf@sandelman.ca> wrote:
> 
>> 
>> Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:
>>> The third and most important discussion was - 3. How do nodes
>> exchange
>>> the version data (with PCE and other nodes) of nodes so a network of
>>> heterogenous nodes (w.r.t version) can interoperate.  1. Proposal -
>> use
>>> the joining flows defined in
>> draft-richardson-6tisch--security-6top-03
>> 
>>> Comments and suggestions on this proposal are requested.
>> 
>> I don't understand why you talk about "version data"?
>> How are the nodes heterogenous?  I suspect that I might be suffering from
>> unshared terminology here.
>> 
>> -- 
>> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
>> -= IPv6 IoT consulting =-
>> 
>> 
>> 
> 
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