The MPLS WG Archive

[Eric Gray <ewgray2k@netscape.net>]

Title:

Neil,

    What you ask should only be a concern if an implementation is
either 
sloppy in allocating labels or not particularly careful about
re-allocating 
them.

    There is a "window of opportunity" if an implementation re-issues
labels
on a time scale similar to expected packet inter-arrival time for
traffic using
that label (either before or after the re-issue). There is also a
window of
opportunity if the same label is somehow issued in two separate contexts
and the LSR is not able to correctly recover context when it
subsequently 
receives  ambiguously labeled packets. 

    The first window is avoidable by a robust implementation. The
second 
window only exists for a broken implementation.

    This is the reason why I feel we are making a big deal out of
nothing 
very much.

    :-)

--
Eric

neil.2.harrison@bt.com wrote:
> Loa,
>
> I was meaning in general, ie labelled pkts.  Just want to check nothing
> is being overlooked here.
>
> regards, Neil
>
> > -----Original Message-----
> > From: Loa Andersson [mailto:loa@pi.se] 
> > Sent: 08 October 2004 11:19
> > To: Harrison,N,Neil,IKR2 R
> > Cc: ewgray@GraIyMage.com; Nick.Weeds@dataconnection.com; mpls@ietf.org
> > Subject: Re: [mpls] For your review - 
> > Issues/errors/clarifications in RFC3 036
> >
> >
> > Neil,
> >
> > are you talking about packets exchange over the TCP 
> > connection between two LDP peers, or (labeled) packets in genral?
> >
> > /Loa
> >
> > neil.2.harrison@bt.com wrote:
> > > Eric,
> > > <Snipped>
> > >  
> > >
> > > > Not if the downstream router sends a label withdraw as an 
> > > >       
> > >     
> > appropriate 
> > > > recovery response to getting a packet with a label that is invalid.
> > > >       
> > > Is there not a possibility that packets might end up at the wrong 
> > > destination for other (defect) reasons?  And in such a case 
> > >     
> > sending a 
> > > label withdraw seems the wrong action...comments?
> > >
> > > regards, Neil
> > >
> > >
> > > _______________________________________________
> > > mpls mailing list
> > > mpls@lists.ietf.org https://www1.ietf.org/mailman/listinfo/mpls
> > >
> > >
> > >     
> > -- 
> > Loa Andersson
> >
> > Principal Networking Architect
> > Acreo AB                           phone:  +46 8 632 77 14
> > Isafjordsgatan 22                  mobile: +46 739 81 21 64
> > Kista, Sweden                      email:  loa.andersson@acreo.se
> >                                             loa@pi.se
> >
> >   
>
> _______________________________________________
> mpls mailing list
> mpls@lists.ietf.org
> https://www1.ietf.org/mailman/listinfo/mpls


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