The MPLS WG Archive

[Yong Xue <yxue@UU.NET>]

Sid,

You are correct. The requirement for connection is generated
from router and it can be serviced by network in the overlay model
or by the router if it's peer model.

/Yong


On Mon, 23 Oct 2000, Sid Chaudhuri wrote:

> I don't see why TE and protection require the routers to specify explicit
> routes.
> The routers can simply specify to the optical layer what type of optical
> layer protection
> it requires.  Based on its traffic flow a router only needs to know between
> which
> two routers it needs to establish a new lightpath.  How the lightpath is
> routed in the
> optical layer seems to me irrelevant to TE.
> 
> Sid Chaudhuri
> 
> 
> 		-----Original Message-----
> 		From:	Kireeti Kompella [mailto:kireeti@juniper.net]
> 		Sent:	Monday, October 23, 2000 11:43 AM
> 		To:	xuyg@lucent.com; yxue@UU.NET
> 		Cc:	ip-optical@lists.bell-labs.com; mpls@UU.NET
> 		Subject:	Re: [IP-Optical] RE: Optical link bundling.
> Was Re: DraftMinutes From         Pittsburgh
> 
> 		Hi,
> 
> 		> > (router determines the explicit routes). 
> 		> 
> 		> This point has been raised by several folks. It really
> confuses me. If the
> 		> optical switches are equipped with path calculation
> ability, what's the benefit
> 		> to bother router to determine the explicit routes within
> optical domain
> 		> (assuming router can be smart enough to handle all optical
> network specific
> 		> attributes and constrains) than just have routers to
> determine the end points of
> 		> optical trails.
> 
> 		Why does this confuse you?  Routers may want to determine
> the exact
> 		path that their LSPs take for a number of reasons, including
> TE and
> 		protection.  If a router doesn't care where its LSPs are
> laid out,
> 		it can install loose hops at the boundaries of the optical
> cloud.
> 
> 		Kireeti.
>