The MPLS WG Archive

["Thomas D. Nadeau" <tnadeau@cisco.com>]

At 06:30 PM 11/26/2002 -0600, Zhu, Rupert wrote:
>Roberto, Yuan:
>
>Interesting scenario.  I agree on Yuan's approach, if you
>insist on mapping the 3 LSPs into one TE tunnel.
>However, why should we choose to map the 3 LSPs to
>the same tunnel?
>
>The application described is to have 3 flows carried in 3 LSPs,
>respectively.  Since there is no logical relationships between
>the 3 LSPs, (e.g., load sharing, backup, etc.), it seems more
>appropriate to model them as 3 independent entities.
>
>Alternative Solution #1:  Map to 3 LSPs directly.
>
>     -- Populate 3 entries in mplsFTNTable (in MPLS-FTN-MIB).
>        Have each mplsFTNActionType=redirectLSP.
>        Have each mplsFTNActionPointer pointing to one
>        of the 3 mplsXCEntry.

         This only works if the LSPs *originate* at the LSR
in question.   I understood that they were merely joining
at the LSR in question and originated at different locations.

>Alternative Solution #2:  Map to 3 tunnels (instead of one).
>
>     -- Populate 3 entries in mplsFTNTable (in MPLS-FTN-MIB).
>     -- Populate 3 entries in mplsTunnelTable, each representing
>        a distinct (logical) tunnel.  (That is, they have different
>        values in mplsTunnelIndex.)
>     -- Have each mplsFTNActionType=redirectTunnel.
>        Have each mplsFTNActionPointer pointing to one of
>        the 3 mplsTunnelEntry.

         Again, I think that you are assuming that the LSPs
originate at the local LSR, which I do not think they do,
but feel free to correct me if I am wrong.

         --Tom



>In other words, if there is no relationship between the 3 LSPs,
>then they do not belong to the same TE tunnel.
>
>My two cents.
>
>-- Rupert
>
>
> > -----Original Message-----
> > From: Yuan Gu [mailto:yuangu@ipinfusion.com]
> > Sent: Monday, November 25, 2002 2:12 PM
> > To: Roberto.Guglielmi@alcatel.it; mpls@UU.NET
> > Subject: RE: TE MIB - LSR MIB integration
> >
> >
> > Hello, Roberto:
> >
> > > -----Original Message-----
> > > From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of
> > > Roberto.Guglielmi@alcatel.it
> > > Sent: Monday, November 25, 2002 3:19 AM
> > > To: mpls@UU.NET
> > > Subject: TE MIB - LSR MIB integration
> > >
> > >
> > > Hello everybody,
> > > I have a doubt about interactions between LSR MIB and TE
> > MIB for what
> > > concerning LSPs nested in TE tunnels.
> > > Consider the following scenario:
> > >
> > > R1 -------- R2 -------- R3
> > >
> > > and suppose, for example, I have three incoming flows. I
> > want to insert
> > > each flow in one LSP and tunnel the three LSPs in one TE tunnel.
> > > My questions are:
> > >
> > > 1) How are the three LSPs mapped on the same TE tunnel?
> >
> > There will be 3 entries in mplsTunnelTable. Each entry has different
> > mplsTuunnelInstance.
> >
> > The mplsTunnelInstance "Uniquely identifies an instance of a
> > tunnel. It is
> > useful to identify multiple instances of tunnels for the
> > purposes of backup
> > and parallel tunnels."
> > You may want to put your LSPID into this field.
> >
> > >
> > > 2) Is there only one entry in the mplsTunnelTable pointing
> > to one entry
> > > in the mplsXCTable?
> >
> > There will be 3 corresponding entries in mplsXCTable. Each entry has
> > different mplsXCLspId (RSVP-TE or CR-LDP).
> >
> >
> >