The MPLS WG Archive

[Chatur sharp <chatur_b@yahoo.com>]

On the face of it what you say seems to be correct.

Could it be that draft should be interpreted as:

"As that there should be no more labels below a NULL
label. However, labels could be applied on top
of a NULL label. "




--- Shahram Davari <Shahram_Davari@pmc-sierra.com>
wrote:
> Toni,
> 
> The Encaps-draft says that the IPV4/6 Explicit Null
> Labels are only legal if
> they are the sole label stack entry. However, in
> your example the RSVP
> messages will have two labels, the outer label and
> the IPV4/6 Explicit Null
> Label. Isn't this a violation of the Encaps-draft
> requirement?
> 
> Regards,
> -Shahram
> 
> >-----Original Message-----
> >From: Tony Li [mailto:tli@Procket.com]
> >Sent: Monday, June 12, 2000 1:22 PM
> >To: curtis@avici.com
> >Cc: Tony Li; Bora Akyol; 'mpls@uu.net'
> >Subject: Re: Hierarchical Tunnel Establishment in
> RSVP-TE 
> >
> >
> >
> >Curtis,
> >
> > | If the outer tunnel is constrained (by
> configuration) to accept only
> > | inner tunnels with one L3PID, then that L3PID
> can be placed on the
> > | outer tunnel.  If there are optimization
> possible for a particular
> > | L3PID (IP src/dst hash to split loading along
> the way comes to mind
> > | for IPv4) then putting the inner L3PID on the
> outer tunnel has
> > | advantages.
> >
> >
> >I agree that this is also possible for
> implementations that 
> >want to parse
> >up the label stack.
> >
> >
> > | No where have I seen a requirement to put a null
> label on traffic
> > | destined to the egress LSR.
> >
> >
> >The requirement exists if you take the more general
> approach 
> >of specifying
> >an outer L3PID of MPLS and then wish to tunnel
> (otherwise 
> >unlabeled) RSVP.
> >Under the approach that you've proposed, this would
> not be necessary.
> >
> >Tony
> >
> 


=====
I am willing to learn,  if you care to teach.
I am willing to teach, if you care to learn.

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