Hi Ramon, Thanks for your suggestion. I concur with your clarifying texts to keep the consistency between this PCEP extension and the encoding draft.
Regards, Young -----Original Message----- From: Ramon Casellas [mailto:[email protected]] Sent: Thursday, October 27, 2011 4:09 AM To: Margaria, Cyril (NSN - DE/Munich) Cc: [email protected] Subject: Re: Some proposal for the next revision of draft-lee-pce-wson-rwa-ext Dear co-authors, While reviewing the current draft, I noticed the following: currently, FEC / modulation restrictions are proposed as one TLV per modulation / FEC as endpoint restrictions However, in draft-ietf-ccamp-rwa-wson-encode-12 the actual TLV is a "fec list" or a "modulation list" I believe that having cases where we have a TLV as one element and cases where we have TLV as a list is error prone, and in order to unify I would like to align draft-lee-pce-wson-rwa-ext to draft-ietf-ccamp-rwa-wson-encode-12 especially since the restriction TLVs can appear more than once --> add them as a list. A first proposed new wording would be as follows: <endpoint-restriction> ::= <LABEL-REQUEST> <label-restriction-list> [<signal-compatibility-restriction>...] Where signal-compatibility-restriction ::= <MODULATION-FORMAT-LIST>|<FEC-LIST> with e.g. Value := A list of FEC type Fields One issue remains. since draft-lee...rwa-02 only used one FEC element field / MODULATION element filed per TLV, it could use the element length field as a reserved field and add a flag X to exclude or include A way to solve this is to allow <signal-compatibility-restriction> to appear twice. One for inclusion and one for exclusion., or to define 2 TLVs <endpoint-restriction> ::= <LABEL-REQUEST> <label-restriction-list> [<signal-compatibility-restriction>...] Where signal-compatibility-restriction ::= <MODULATION-FORMAT-LIST-INCLUDE-TLV> <FEC-LIST-INCLUDE-TLV> <MODULATION-FORMAT-LIST-EXCLUDE-TLV> <FEC-LIST-EXCLUDE-TLV> My main argument for this is to align fully with draft-ietf-ccamp-rwa-wson-encode-12 Finally, I would like to consider the use case where the LSC LSP crosses an O/E/O. Do we need control on the modulation/FEC at that point? Comments? R. -- Ramon Casellas, Ph.D. Research Associate - Optical Networking Area -- http://wikiona.cttc.es CTTC - Centre Tecnològic de Telecomunicacions de Catalunya, PMT Ed B4 Av. Carl Friedrich Gauss, 7 - 08860 Castelldefels (Barcelona) - Spain Tel.: +34 93 645 29 00 -- Fax. +34 93 645 29 01 _______________________________________________ Pce mailing list [email protected] https://www.ietf.org/mailman/listinfo/pce
