The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] [mpls] Re: Y.1720 liased text
Hello Neil, You responded: > Thanks Huub, > > Can you clarify how the S bit is set when this 1+1 seq no. field is > used? I checked the appendix II twice (because my left eye is still 10%), I could not find any text referring to setting the S bit. I only see that the 4 octet sequence number is placed right after the shim header. > What is puzzling me is this sentence in the text Stewart > extracted from Y.1720/Appendix 11: > > "Note that packet 1+1 can be provided at any level of the hierarchy of a > nested LSP." > > I sort-of read this as there can be a set of nested LSPs (hence > concatenated MPLS headers) and that the protection mechanism can be > applied to any one of these within such a stack. Am I reading this > right? I agree with your reading. > If I am, then please see my concerns of yesterday on this > thread....which, in essence, is querying what happens if there is > misconnectivity and the LSP carrying the 1+1 Seq No. stuff arrives at > some arbitrary LSR.....how will that LSR parse/interpret the fields it > sees? > > I have no background on Y.1720, so my apologies if I am asking a dumb > question. There are no dumb questions, only dumb answers. Maybe this is one: This morning I did some further investigating where the text originates and found it in the IETF archives: http://www.watersprings.org/pub/id/draft-nagarajan-ccamp-mpls-packet-protection-00.txt It was also discussed on the MPLS WG list and there I found the answer to your concerns expressed above (provided by yourself ;-) http://cell.onecall.net/mhonarc/mpls/2002-Apr/msg00211.html Cheers, Huub. -- ================================================================ http://www.van-helvoort.eu/ ================================================================ Always remember that you are unique...just like everyone else... _______________________________________________ mpls mailing list mpls@lists.ietf.org https://www1.ietf.org/mailman/listinfo/mpls
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