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Re: [Rtg-yang-coord] issue :R03: assignment of interfaces to routing instances

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 13 January 2015 21:27 UTC

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Date: Tue, 13 Jan 2015 22:27:32 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Ladislav Lhotka <lhotka@nic.cz>
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Subject: Re: [Rtg-yang-coord] issue :R03: assignment of interfaces to routing instances
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On Tue, Jan 13, 2015 at 05:42:38PM +0100, Ladislav Lhotka wrote:
> 
> > 2. Add an attribute routing-instance-ref (type leafref) in interface to point to the name attribute (key) of routing-instance.
> 
> This is IMO a good idea, we would then have links in both directions.
>

I assume this would be config false state data, otherwise we only add
configuration complexity for no real value. And this likely would have
to be a leaf-list.

> > 3. Make the new routing-instance-ref added above to be part of the key, i.e. create a composite key <name, routing-instance-ref> for interface.
> 
> This is not possible because:
> 
> - the key of the if:interface list cannot be extended by additional components;
>  
> - if:interface is a flat list that contains interfaces of all layers, but an assignment to a routing-instance makes sense only for L3 interfaces;
> 
> - YANG module ietf-interfaces is intended for all kinds of devices, including those that don’t implement ietf-routing.
>

+1

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1, 28759 Bremen, Germany
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