Re: [mpls-linux-general] Re: [MPLS-Linux] RSVP-TE (was: New mailing list)
Status: Beta
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jleu
From: Ramanjaneyulu Y T <yt...@cs...> - 2000-12-01 04:42:22
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On Thu, 30 Nov 2000, James R. Leu wrote: > On Thu, Nov 30, 2000 at 10:52:30PM +0530, Ramanjaneyulu Y T wrote: > > Hi James , > > This is really good job. I appreciate your efforts. Are u doing any work > > related to RSVP-TE ?. > > Not as part of MPLS for Linux yet. I have done some work with RSVP-TE > for my employeer. Because of that fact I can't be the one to start working > on RSVP-TE for Linux, but if some else "starts" it I'll make it part > of MPLS for Linux ;-) > > > I have one queastion related to LSP hierarchy. How LSRs distinguish > > label stack ?. How remote LSR knows it label from other side , if > > hierarchy is permited ?. > > First, I guess we need to get a few things sorted out, before I can > answer that question. > > Are you refering to using RSVP-TE to create hierarchy, or are you refering > to how hierarchy works in general. I am referring to create hierarcht. > > If your refering to using RSVP-TE to create hierarchy, are you confused > about how to signal it or how (after it has been signaled) the ILM, NHLFE > are setup to actually do hierarchy? If I remember right , hierarchy is achieved with help of PUSH and FWD operations in ILM and NHLFE . Last night i refered some drafts and RSVP-TE supports Label stacks in LABEL object . My queastion is how LSR knows , how many labels pop ( i.e take off from) from LABEL object. Let me explain my probelm clealry. LER1 LER21 LER22 .... LER 2 |-----| |-----| . . | ----| |-----| | |----------| |------| |-------| | |-----| |-----| |-----| |-----| LER21 and LER22 is one MPLS domain. Suppose LER1 want to establish LSP to LER2. If one allows Hierarchy setting , it should make use of LSP between LER21 and LER22. when LER2 responded with RESV message, How this RESV message is treated in MPLS domain ( beteen LSR21 and LER22) ?. IN normal case each LSR gets one new label for previous hop and it binds this with next hop label , which he got from next hop. , then it propagets to previous hop. If we r setting hierarchial lSPs , only resource reseravtion done at each LSR when RESV messagae comes. No label storing abd getting new label at each core LSRs in MPLS domain 1 , except at edge routers. So how core LSrs will ignore to store label info ? . I think I am clear now. > > Sorry to answer you question with questions. > > Jim > > BTW "First post" :-) > |