The MPLS-OPS Archive

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

At 04:22 PM 11/21/2002 +0100, Roberto.Guglielmi@alcatel.it wrote:
>Hello everyone,
>
>the draft-ietf-mpls-lsp-hierarchy-08.txt describes how to set up two 
>different LSP to create a hierarchy of such LSPs. The document states:
>"2. Abstract
>   .....A way to create such a hierarchy
>   is by (a) a Label Switching Router (LSR) creating a Traffic
>   Engineering Label Switched Path (TE LSP), (b) the LSR forming a
>   forwarding adjacency (FA) out of that LSP (by advertising this LSP as
>   a Traffic Engineering (TE) link into the same instance of ISIS/OSPF
>   as the one that was used to create the LSP), (c) allowing other LSRs
>   to use FAs for their path computation, and (d) nesting of LSPs
>   originated by other LSRs into that LSP (by using the label stack
>   construct)....."
>
>What is not clear to me is how this LSP hierarchy is reflected inside the 
>MIBs.
>Suppose I want to set up two nested LSPs beginning both at the ingress node
>for example to transport ETS flows within an MPLS domain.
>The Ingress node should push two labels on L2 packets.
>I have the following questions:
>
>1)    Is the LSR MIB sufficient? Or is the TE MIB necessary?
>       From my point of view the LSR is sufficient: the 
> mplsOutSegmentTable contains the top label,
>       while the mplsLabelStackTable contains the bottom label.

         I think that all that you would see is a bunch of LSPs that
might all use the same outgoing label (with perhaps a different label
stack).

>2)    When the Ingress node receives the Resv message of the inner LSP, 
>how are the MIBs populated,
>       with what information and how the two nested LSPs are matched?
>
>3)    What information is used to refer to the entry inside the MIB 
>relating to the outer LSP?

         The LSR MIB treats all LSPs the same way.

         --Tom


>Thanks a lot for spending your valuable time to fill my lacks.
>Regards, Roberto
>
>
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