The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Confusion on spec in MPLS support of Diff-Serv
Thomas, At 10:35 20/09/2000 -0700, Thomas Huang wrote: > >Hello: > >I am not clear if the handling of RVSP path message w/o diffserv object in >the draft is workable (section 5.3 : handling diffserv object - by Le >Faucheur) > >In Section 5.3, it says when a LSR receives a PATH message without DIFFSERV >OBJECT, it should interpret this a a request for an E-LSP using the >preconfigured EXP-PHB mapping. >But then it adds that for compatibility, an overwrite option can be >activated for LSRs that don't support diff-serv. > >It appears to me that these two things are conflicting because a LSR may >support both diff-serv and non-diff-serv, i.e. how does a LSR know a RSVP >path msg without diffserv object should use preconfigured exp-phb or just >behave as a non-diff-serv aware LSR. > The draft states that the "override option" is a configurable thing. So: - if the "override option" is not supported or has not been turned on by configuration, then the LSR will consider an LSP signaled without a Diff-Serv object as a Diff-Serv E-LSP that will be using the "preconfigured EXP<-->PHB mapping". - if the "override option" is supported and has been turned on by configuration, then the LSR will consider an LSP signaled without a Diff-Serv object as a non-Diff-Serv LSP that will be granted some non-Diff-Serv QoS treatement (for instance Int-Serv Controlled Load or Guaranteed Service). Does ths clarify? Francois >Thanks for any clarification and help. > >Thomas > _________________________________________________________________ Francois Le Faucheur Development Engineer, IOS Layer 3 Services Cisco Systems Office Phone: +33 4 92 96 75 64 Home Office Phone: +33 4 92 94 00 78 Mobile : +33 6 89 108 159 Vmail: +33 1 58 04 62 66 Fax: +33 4 92 96 79 08 Email: flefauch@cisco.com _________________________________________________________________ Petra B - Les Lucioles - 291, rue Albert Caquot - 06560 Valbonne - France _________________________________________________________________
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