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

[Xufeng Liu <[e-mail]>]

> -----Original Message-----
> From: Ladislav Lhotka [mailto:[e-mail]]
> Sent: Wednesday, January 14, 2015 4:38 AM
> To: Jürgen Schönwälder
> Cc: Xufeng Liu; [e-mail]; Acee Lindem (acee)
> Subject: Re: [Rtg-yang-coord] issue :R03: assignment of interfaces to routing
> instances
> 
> 
> > On 13 Jan 2015, at 22:27, Juergen Schoenwaelder <j.schoenwaelder@jacobs-
> university.de> wrote:
> >
> > 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
> 
> Yes, right. I’d propose to configure this assignment under routing-instance and
> the have the reference(s) to the routing-instance as an (optional) item in
> if:interface entries (in their state data).
> 
> > configuration complexity for no real value. And this likely would have
> > to be a leaf-list.
> 
> This depends on whether we conclude that the assignment has to be disjoint or
> not. I support the latter option, so yes, I’d also prefer to have a leaf-list for this
> purpose.
> 
> Lada
> 
> >
> >>> 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
> >
[Xufeng] Hi Lada, I acknowledge the difficulties here. However, is there a good way to handle the following case?
	In routing-instance "RI-A", an interface named "IF-1" is already configured.
	In routing-instance "RI-B", I'd like to configure an different interface with the same name "IF-1".
Thanks,
- Xufeng
> > --
> > Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> > Phone: [phone]         Campus Ring 1, 28759 Bremen, Germany
> > Fax:   [phone]         <http://www.jacobs-university.de/>
> 
> --
> Ladislav Lhotka, CZ.NIC Labs
> PGP Key ID: E74E8C0C
> 
> 
>