The MPLS WG Archive

[Rahul Aggarwal <rahul@redback.com>]

On Thu, Jul 13, 2000 at 02:44:43PM +0100, Adrian Farrel wrote:
> Oops.  now sending the entire message!
> 
> 
> This appears to bring RSVP into line with CR-LDP so that only one level of
> label can be signaled.  
> 
> Label stacking is not prevented by this approach, it simply narrows the
> options towards the commonly implemented ways of label stacking (for example
> signaling down the tunnel).

There could be different ways of doing label stacking. Hence label stacking is
not prevented by this approach. However I don't seen a reason for removing the
flexibility of signaling multiple labels with RSVP in the label object. The
earlier draft stated 'For implementations that do not support a label stack,
only the top label is examined. The rest of the label stack SHOULD be passed
through unchanged'. That seems like a reasonable approach to me.

It will be nice to hear from the authors what their reasons/motivations are
for making this change.

thanks,
rahul



> 
> Regards,
> Adrian
> --
> Adrian Farrel  mailto:af@datcon.co.uk
> Network Convergence Group
> Data Connection Ltd., Chester, UK
> http://www.datcon.co.uk/
> Tel: +44 (0) 1244 313440  Fax: +44 (0) 1244 312422
> 
> 
> >-----Original Message-----
> >From: Laurel - Ganesh Murugesan 
> >Sent: Thursday, July 13, 2000 2:02 PM
> >To: Rahul Aggarwal; George Swallow
> >Cc: mpls@UU.NET
> >Subject: RE: draft-ietf-mpls-rsvp-lsp-tunnel-06.txt
> >
> >
> >
> >
> >> -----Original Message-----
> >> From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of Rahul
> >> Aggarwal
> >> Sent: Wednesday, July 12, 2000 5:07 PM
> >> To: George Swallow
> >> Cc: Rahul Aggarwal; mpls@UU.NET
> >> Subject: Re: draft-ietf-mpls-rsvp-lsp-tunnel-06.txt
> >> 
> >> 
> >> George,
> >> Thanks for the comments. I have a couple of inline comments:
> >> 
> >> Also I just realized that the new draft has limited the contents 
> >> of the label
> >> object to a single label, rather than a stack of labels. What is 
> >> the reason
> >> for this limitation? 
> >> 
> >
> >====> But Section 1.1 Background 2nd paragraph says 
> >      "Label stacking is also supported."
> >
> >thanks
> >ganesh
> >