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Re: [netmod] Adveritzing submodule in <hello>

Ram Polisetty Subbaiah <ramas@juniper.net> Tue, 20 October 2020 14:22 UTC

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From: Ram Polisetty Subbaiah <ramas@juniper.net>
To: Martin Björklund <mbj+ietf@4668.se>
CC: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] Adveritzing submodule in <hello>
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Date: Tue, 20 Oct 2020 14:22:22 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/Hs4d7TLhFXytJNUxSTB8gVaFbfo>
Subject: Re: [netmod] Adveritzing submodule in <hello>
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Thanks Martin,

One more follow up question:

If in case both Client and Server are compatible only with Yang 1.0, how client/server are supposed to
handle capabilities advertisement for submodules? By any chance is it a limitation in 1.0?

Thanks,
Ram

On 20/10/20, 7:34 PM, "Martin Björklund" <mbj+ietf@4668.se<mailto:mbj+ietf@4668.se>> wrote:

[External Email. Be cautious of content]


Ram Polisetty Subbaiah <ramas=40juniper.net@dmarc.ietf.org<mailto:ramas=40juniper.net@dmarc.ietf.org>> wrote:
Hi,

As per RFC 6020:

===
https://urldefense.com/v3/__https://tools.ietf.org/html/rfc6020*section-5.6.4.1__;Iw!!NEt6yMaO-gk!ViE3k69OOP_eUBbCYJQj30wOp5eFP5wV5Bex288dxmJ2T--9Z1TTLAk4tCUc3Q$<https://urldefense.com/v3/__https:/tools.ietf.org/html/rfc6020*section-5.6.4.1__;Iw!!NEt6yMaO-gk!ViE3k69OOP_eUBbCYJQj30wOp5eFP5wV5Bex288dxmJ2T--9Z1TTLAk4tCUc3Q$>    Modules
    Servers indicate the names of supported modules via the <hello>
    message.  Module namespaces are encoded as the base URI in the
    capability string, and the module name is encoded as the "module"
    parameter to the base URI.

    A server MUST advertise all revisions of all modules it implements.

    For example, this <hello> message advertises one module "syslog".

    <hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
      <capability>
        https://urldefense.com/v3/__http://example.com/syslog?module=syslog&amp;revision=2008-04-01__;!!NEt6yMaO-gk!ViE3k69OOP_eUBbCYJQj30wOp5eFP5wV5Bex288dxmJ2T--9Z1TTLAmPyrVZPQ$<https://urldefense.com/v3/__http:/example.com/syslog?module=syslog&amp;revision=2008-04-01__;!!NEt6yMaO-gk!ViE3k69OOP_eUBbCYJQj30wOp5eFP5wV5Bex288dxmJ2T--9Z1TTLAmPyrVZPQ$>
      </capability>
    </hello>
===

My question is, if there are some submodules, should server advertise
the submodules also in <hello>?

No.

Note that module advertisement is done through YANG library in YANG
1.1 (RFC 7950).  Submodules are present in the YANG library (RFC
8525).


/martin


If so, what is the defined format for advertising the same?

Thanks,
Ram


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