Re: [netmod] Comments on draft-ma-netmod-immutable-flag-06

[Jürgen Schönwälder <[e-mail]>]

On Mon, Apr 24, 2023 at 08:50:02AM +0000, maqiufang (A) wrote:
> 
> 2) The "immutable" YANG extension statement (not the metadata annotation) designates, at the schema-level, config=true nodes that, when present in <running/startup/candidate>, are system-defined and hence immutable.
> Note that NMDA does allow clients to create an interface entry with an interface-type value which is not yet physically present. Only when the interface physically appears, the type cannot be modified with another value not matching the real value the device is actually in use.
>

My assumption so far is that an interface configuration is matched
against hardware and it is applied if there is matching hardware. In
other words, if an edit makes the interface configuration not match
the hardware anymore, then the config is simply not applied anymore
and the interface is left unconfigured. (The same would happen if you
replace an interface with another that does not match the current
config.) The idea that an interface configuration becomes partly
immutable once it is applied to a matching physical interface is not
really reflecting how I understand the design of N/Y. Also the notion
of immutable data in candidate, which is rather a scratchpad to
assemble bigger changes, seems odd to me.

/js

-- 
Jürgen Schönwälder              Constructor University Bremen gGmbH
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