RE: [PWE3] PWE3 question

[Sasha Vainshtein <Sasha@AXERRA.com>]

Shahram,

IMHO, if you use only one label for a PW, it is this label that
is switched through the path from ingress to egress. 
Aand if the routesr do not recognize the VC FEC, how should
they assign and switch labels associated with this FEC?

With best regards,
                                   Sasha Vainshtein
email:     sasha@axerra.com <mailto:sasha@axerra.com> 
tel:       +972-3-7659993 (office)
           +972-8-9254948 (res.)
           +972-58-674833 (cell.)
 


> -----Original Message-----
> From: Shahram Davari [mailto:Shahram_Davari@pmc-sierra.com]
> Sent: Wednesday, May 08, 2002 9:05 PM
> To: 'Sasha Vainshtein'; 'Andrew G. Malis'
> Cc: 'pwe3@ietf.org'; Danny McPherson (E-mail)
> Subject: RE: [PWE3] PWE3 question
> 
> 
> Sasha,
> 
> I don't think in this case all the routers in the PSN
> need to recognize the VC FEC.  You could set the U/F bits to 1
> in VC FEC, therefore no need for the interior routers to
> recognize the VC FEC.
> 
> 
> -Shahram
> 
> 
> 
> > -----Original Message-----
> > From: Sasha Vainshtein [mailto:Sasha@AXERRA.com]
> > Sent: Wednesday, May 08, 2002 1:59 PM
> > To: 'Andrew G. Malis'; Shahram Davari
> > Cc: 'pwe3@ietf.org'; Danny McPherson (E-mail)
> > Subject: RE: [PWE3] PWE3 question
> > 
> > 
> > Andy and Shahram,
> > 
> > IMHO using only one label would, regardless
> > of the other issues, violate one of the requirements
> >  of the PWE3 Charter:
> > 
> > <quote>
> > PWE3 will not exert controls on the underlying PSN,
> > but only function at the endpoints of the pseudo wire, 
> > though the endpoints may be configured to set diffserv 
> > codepoints in the tunneling datagrams. 
> > <end quote>
> > 
> > Building an explicit TE tunnel for a single PW means to me 
> > exerting a control over the PSN (e.g., all the routers in the PSN
> > should recognize VC FECs etc.).
> > 
> > In other words, it probably can be done, but it would not be PWE3.
> > 
> > With best regards,
> >                                    Sasha Vainshtein
> > email:     sasha@axerra.com <mailto:sasha@axerra.com> 
> > tel:       +972-3-7659993 (office)
> >            +972-8-9254948 (res.)
> >            +972-58-674833 (cell.)
> >  
> > 
> > 
> > > -----Original Message-----
> > > From: Andrew G. Malis [mailto:Andy.Malis@VivaceNetworks.com]
> > > Sent: Wednesday, May 08, 2002 5:51 PM
> > > To: Shahram Davari
> > > Cc: 'Andrew G. Malis'; 'pwe3@ietf.org'
> > > Subject: RE: [PWE3] PWE3 question
> > > 
> > > 
> > > Shahram,
> > > 
> > > Yeah, you would have to treat each VC as a separate TE 
> > tunnel and use 
> > > either RSVP-TE or CR-LDP for signaling (suitably extended 
> > > along Martini 
> > > lines for VC type and ID).
> > > 
> > > Cheers,
> > > Andy
> > > 
> > > -------
> > > 
> > > At 5/8/2002 08:33 AM -0700, Shahram Davari wrote:
> > > >Andy,
> > > >
> > > >Sure I understand the scaling issue. But ignoring the 
> scalability,
> > > >I want to know if it can be done and if so how?
> > > >
> > > >It seems that you may not be able to use LDP any more, 
> > because VC FEC
> > > >is meaningless to the interior LSRs. But it seems that you 
> > could use
> > > >ER-LSPs and therefore do TE. Right?
> > > >
> > > >Yours,
> > > >-Shahram
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: Andrew G. Malis [mailto:Andy.Malis@vivacenetworks.com]
> > > > > Sent: Tuesday, May 07, 2002 6:12 PM
> > > > > To: Shahram Davari
> > > > > Cc: 'pwe3@ietf.org'
> > > > > Subject: Re: [PWE3] PWE3 question
> > > > >
> > > > >
> > > > > Shahram,
> > > > >
> > > > > Well, it wouldn't scale very well since every switch along
> > > > > the path is
> > > > > involved in the signaling for each VC, and you can't 
> do traffic
> > > > > engineering, so I would say that's pretty much a non-starter.
> > > > >
> > > > > Cheers,
> > > > > Andy
> > > > >
> > > > > At 5/7/2002 12:02 PM -0700, Shahram Davari wrote:
> > > > > >Hi,
> > > > > >
> > > > > >Can we implement PWE3 with only one label (i.e., only 
> > VC label)?
> > > > > >
> > > > > >-Shahram
> > > > > >
> > > > > >_______________________________________________
> > > > > >pwe3 mailing list
> > > > > >pwe3@ietf.org
> > > > > >https://www1.ietf.org/mailman/listinfo/pwe3
> > > > >
> > > 
> > > 
> > > _______________________________________________
> > > pwe3 mailing list
> > > pwe3@ietf.org
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> > > 
> > 
> 

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