Re: [Detnet] L2/L3 model?

You mean an L3 router who needs an L2 circuit would ask for an L2 path computation element possibly in the same node to provide a service for setting up the L2 circuit between two L3 nodes?

- Jouni

> -----Original Message-----
> From: detnet [mailto:detnet-bounces@ietf.org] On Behalf Of Philippe Klein
> Sent: Monday, November 17, 2014 9:02 PM
> To: Erik Nordmark
> Cc: detnet@ietf.org
> Subject: Re: [Detnet] L2/L3 model?
> 
> Erik,
> In my humble view, the L3 must only indicate the L3 router path over of the L2
> island with its path attributes  and let the L2 protocol select the constrained
> path.
> Essentially the inner L2 topology could be ignored by the L3.
> 
> /Philippe
> Broadcom
> 
> Sent from my iPhone
> 
> > On Nov 17, 2014, at 20:11, "Erik Nordmark" <nordmark@acm.org> wrote:
> >
> >
> > After the BoF I realized there was one thing we didn't talk about which is what
> combined L2 and L3 topologies that folks have in mind.
> > It is true that from a packet forwarding perspective both L2 and L3 have
> queues and clocks, but the interaction with the control plane and the approach
> might be different for different forms of combinations.
> >
> > First of all we have 6TISCH which is an L3-only network.
> >
> > But in combined L2/L3 networks we could have at least
> > - interconnecting L2 islands using L3
> > - arbitrary topologies with mixtures of L2 and L3 forwarding devices
> >
> > A suggestion (at the mike during the BoF) was to consider pseudo-wires. That
> might make sense when interconnecting L2 islands.
> > But with arbitrary topologies one could end with with a path that as a mixture
> of bridges and routers e.g.
> >
> >     Sender - B1 - B2 - R1 - B3 - B4 - B5 - R2 - R3 - Listener
> >
> > Are there use cases that result in such topologies/paths?
> >
> > Would one need one controller which is aware of both the L2 and L3 devices
> and can pick paths (with resources) that include both?
> > (Typically we separate the layers thus we might have a PCE which sees the L3
> topology but not the L2 devices in between the routers.)
> >
> > I think it would be good to explore the combined L2/L3 use cases and models
> in more detail.
> >
> >   Erik
> >
> > _______________________________________________
> > detnet mailing list
> > detnet@ietf.org
> > https://www.ietf.org/mailman/listinfo/detnet
> 
> _______________________________________________
> detnet mailing list
> detnet@ietf.org
> https://www.ietf.org/mailman/listinfo/detnet