The MPLS WG Archive

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

>Can somebody tell me what I am missing here ?
>
>I was wondering if makes sense to have
>mplsInSegmentXCIndex object in MplsInSegmentEntry as read-create and
>remove the <mplsInSegmentIfIndex, mplsInSegmentLabel> from the mplsXCEntry
>INDEX.
>
>I am asking this because,
>In multiple insegment entries cross connected with one outsegment entry
>case, it works fine.
>if we use multiple outsegment entries, we need to create multiple cross
>connect entries with all possible combinations, also provide administrative
>control to enable / disable each of the combinations.

         Not necessarily. Have you considered using the same
XCIndex, mplsInSegmentIfIndex, mplsInSegmentLabel, but a
different outSegmentIndex?

>Isnt it good enough to say - these are the InSegments that belong to the
><LSP/Crossconnect Index>, and these are the <OutLabelStack +
>OutSegmentEntry> (XCEntries) entries for the <LSP / Crossconnect Index> ...
>and let the LSR use whatever mechanism to choose which of the <OutLabel +
>OutSegmentEntry> entries to use.

         I think that the indexing I showed above will satisfy this. Just 
disable
the XCentry (or entries) whose XCindex = the one used to group all segments
together.

>I am trying to reason out the rationale behind the current design ..
>
>Is it because administrative control (disable / enable) is required at
>various combinations / preclude certain combinations of In and Out segment
>entries ?

         Admin control is given on the cross-connect because this
is what binds together (associates) the incoming label(s) with
the outgoing label(s).  If you have a multi-point to multi-point
LSP, you can quickly disable/enable it.

         --Tom


>Or is it this way because it is more readable ?
>
>I understand we wont be able to call it XC , if we made the change.
>I also understand that I could internally maintain it anyway, as long as I
>am able to provide the interface.
>
>
>TIA,
>Kans.



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