Re: AD Evaluation: draft-ietf-dmm-requirements

Hi Anthony,

On 1/29/14 1:51 PM, h chan wrote:
> Brian,
> 
> The requirement is intended to include a capability of not using
> network-layer mobility management, as opposed to using it by default.
> 
> 
> I think it is sufficient to leave to the explanation (the sentences
> after the first sentence) to say that network-layer mobility support
> is not always needed in order to justify this capability.
> 
> The alternative then is to say that network-layer mobility is
> provided but it is possible to not use such support.
> 
> REQ2:  Using and not Using Network-layer mobility support
> 
> DMM solutions MUST enable network-layer mobility but it MUST be
> possible to not invoke it. Mobility support is needed, for example, 
> when an application or a host cannot cope with a change in the IP
> address when a node moves. Yet a mobile node can often be
> stationary, and mobility support can also be provided at other
> layers. It is then not always necessary to maintain a stable IP
> address or prefix.
> 
> Of cause "enable" does not mean it must be used. Yet explicitly say
> "it is possible to not invoke it" is to draw the contrast to using it
> by default.

My only concern is that it is unclear *who* invokes the network-layer
mobility support.  Is it envisioned that the application can signal the
need for mobility support?  Does the user have to configure which
applications get support?

Regards,
Brian

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