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Re: [Netmod-ver-dt] Client version selection draft

"Joe Clarke (jclarke)" <jclarke@cisco.com> Fri, 06 September 2019 20:53 UTC

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From: "Joe Clarke (jclarke)" <jclarke@cisco.com>
To: "Reshad Rahman (rrahman)" <rrahman@cisco.com>
CC: "netmod-ver-dt@ietf.org" <netmod-ver-dt@ietf.org>
Thread-Topic: [Netmod-ver-dt] Client version selection draft
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Date: Fri, 06 Sep 2019 20:53:13 +0000
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Subject: Re: [Netmod-ver-dt] Client version selection draft
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On Sep 6, 2019, at 16:46, Reshad Rahman (rrahman) <rrahman@cisco.com<mailto:rrahman@cisco.com>> wrote:

Hi all,

The draft<https://datatracker.ietf.org/doc/draft-wilton-netmod-yang-ver-selection/> has 2 schemes for clients to select version:

  *   Via port number (port maps to schema-set). This works for both NETCONF and RESTCONF

  *   Via root-path (root-path maps to schema-set). This works for RESTCONF only.


Would like to hear from the DT on  this, more specifically:

  1.  Any other directions we should investigate as a solution for this? E.g. new NETCONF RPC (or updating capability exchange somehow)?
  2.  How important is it to have the same scheme work for both NETCONF & RESTCONF?
  3.  Any concerns if we have more than 1 solution per protocol? The WG will have a big say in this obviously.

One solution that _could_ work for both protocols is username indexing.  That is, you pick a character to delimit the username from the package version.  For example:

jclarke%1.3.1

This has the obvious advantages that you don’t burn TCP port numbers for NETCONF and it would work for both protocols.  A big disadvantage is usernames cannot contain the delimiter otherwise (well, they could if you have rules like if the second portion is not a known version pattern, it treats the whole string as the username).

I don’t know if the WG would accept this, though.

A modified approach do this is to use a different SSH subsystem for NETCONF (e.g., netconf%1.3.1).  This only works for NETCONF, but it doesn’t burn TCP ports.

Joe

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