Re: [Rtg-yang-coord] templates for protocol parameters

Hi Lada,

The idea sounds good to me. In term of details, we must think about creating "intelligent" templates.
What I mean is that applying some parameters to some items only.

For example, being able to apply a routing-protocol template to only bgp instances which name matches a regexp ...

Here is what I see :
- being able to apply the template at multiple level (routing-instance level, or routing-protocol level)
- if the template is applied at routing-instance level, the routing-protocol part of the template routing-instance will apply to all routing-protocols that will match the container of the template (if type is OSPF within the template, it will apply only to OSPF routing protocols)
- the name leaves in the template could be used to store a regular expression, or maybe we need to use another leaf. The regexp will permit to identify which container are eligible for inheritance.

The main concern I have is if we develop such template for routing, would it be interesting to extend it to all configurations ? (routing, interfaces ...)

-----Original Message-----
From: Rtg-yang-coord [mailto:rtg-yang-coord-bounces@ietf.org] On Behalf Of Ladislav Lhotka
Sent: Tuesday, January 27, 2015 11:03
To: rtg-yang-coord@ietf.org
Subject: [Rtg-yang-coord] templates for protocol parameters

Hi,

the templates that would allow for sharing/inheriting some protocol parameters may be implemented in the current "ietf-routing" module as
follows:

1. Define a new identity for the template routing instances:

    identity template-routing-instance {
        base routing-instance;
    }

2. Define a new leaf under "routing-protocol" for referring to a
   template protocol instance:

    leaf template-ref {
        type leafref {
            path "/rt:routing/rt:routing-instance/rt:routing-protocols"
               + "/rt:routing-protocol/rt:name";
    }

With this, a routing instance of the type "template-routing-instance"
can be configured, and inside it any number of protocol instances (with appropriate types) containing template parameters.

A "real" protocol instance would then use the "template-ref" leaf for pointing to a template protocol instance and share/inherit its parameters.

I think it would then be easy to map inherited parameters in the protocol-centric design to such a template, and vice versa.

Could this work?

Lada

--
Ladislav Lhotka, CZ.NIC Labs
PGP Key ID: E74E8C0C

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