The MPLS WG Archive

[Shahram Davari <Shahram_Davari@pmc-sierra.com>]

LDP path is the same as IP path, and can change over time, therefore is not predictable.

-Shahram
> -----Original Message-----
> From: Sukanta ganguly [mailto:sganguly@yahoo.com]
> Sent: Friday, May 31, 2002 2:03 PM
> To: Suryanarayana, Ananth; Shahram Davari; 'mpls@uu.net'
> Cc: 'ppvpn@ppvpn.francetelecom.com'
> Subject: RE: Basic LDP Question
> 
> 
> Sharam,
>   LDP helps to lay out the path the packet will travel
> from ingress to egress of the MPLS path. It is not
> exactly source based routing but a predictive path is
> built for the packets with certain colors.
> 
> Ananth,
>   MPLS itself can be a VPN path when
> security/encryption is associated with the packet. So
> don't think of it has a IP-VPN enclosed in an MPLS
> VPN. They do not overlap. However, I have heard of
> talks of MPLS VPN on top of IP VPN. This could be due
> to the fact that an IPVPN already exists and MPLS
> based paths are new addition. 
> 
> SG
> 
> 
> 
> --- "Suryanarayana, Ananth" <ananth@celoxnetworks.com>
> wrote:
> > 
> > If MPLS over IP is used, how can the overlapping VPN
> > IP address be handled..
> > In case of multiple labels, the label would
> > distinguish the overlapping
> > address spaced packets correctly , isn't it?
> > 
> > Ananth
> > 
> > -----Original Message-----
> > From: Shahram Davari
> > [mailto:Shahram_Davari@pmc-sierra.com]
> > Sent: Friday, May 31, 2002 1:48 PM
> > To: 'Suryanarayana, Ananth'; 'mpls@uu.net'
> > Cc: 'ppvpn@ppvpn.francetelecom.com'
> > Subject: RE: Basic LDP Question
> > 
> > 
> > 1) My question was explicitly related to LDP which
> > can't do source-routing.
> > 2) I was thinking of MPLS over IP not IP over IP.
> > 
> > -Shahram
> > 
> > > -----Original Message-----
> > > From: Suryanarayana, Ananth
> > [mailto:ananth@celoxnetworks.com]
> > > Sent: Friday, May 31, 2002 1:43 PM
> > > To: Shahram Davari; 'mpls@uu.net'
> > > Cc: 'ppvpn@ppvpn.francetelecom.com'
> > > Subject: RE: Basic LDP Question
> > > 
> > > 
> > > traditional IP forwarding is a hopbyhop basis and
> > hence very difficult
> > > manage the path taken by a packet (end-too-end)...
> > I think 
> > > MPLS is like
> > > source-routing, but with much more control over
> > the packet 
> > > flow.. and one of
> > > the other uses is for seting up vpns using
> > multiple label 
> > > header stacks,
> > > which is much more simple and efficient then
> > maintaining IP over IP
> > > tunnels..
> > > 
> > > Ananth
> > > 
> > > 
> > > 
> > > -----Original Message-----
> > > From: Shahram Davari
> > [mailto:Shahram_Davari@pmc-sierra.com]
> > > Sent: Friday, May 31, 2002 1:28 PM
> > > To: 'mpls@uu.net'
> > > Cc: 'ppvpn@ppvpn.francetelecom.com'
> > > Subject: Basic LDP Question
> > > 
> > > 
> > > Hi,
> > > 
> > > What problem a mp2p LDP-based MPLS network is
> > trying to solve 
> > > (like the one
> > > used in RFC2547) that can't be done with pure IP
> > forwarding?
> > > 
> > > Note: Don't tell me fast forwarding, because we
> > can do fast 
> > > IP lookup as
> > > well.
> > > 
> > > Yours,
> > > Shahram
> > > 
> > 
> 
> 
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