Hi WG, I'm facing an interop issue between two PCEP implementations. PCE from vendor1 sends the PCInitiate for an SRTE LSP using the PST=1 in the SRP Object. PCC from vendor2 handles it correctly and delegates the LSP to the PCE using PST=1. When the PCE sends a PCUpdate message, it does not set the PST TLV in the SRP Object. The PCC rejects the PCUpdate because of a bad ERO subobject type. It reads the PCUpdate as having PST type=0.
Based on my reading of draft-ietf-pce-lsp-setup-type & draft-ietf-pce-segment-routing. PST draft tells that for the PCE Initiation case, the PCE MAY include the PST if the message does not ave any other means of indicating the path setup type. SR draft tells "In order to setup an SR-TE LSP using SR, RP or SRP object MUST include PATH-SETUP-TYPE TLV". Unfortunately it does not specify explicitly in which message. From a reading perspective, we can understand from "In order to setup" that it applies to the PCInitiate message. But nothing tells about the PCUpdate message. However draft-ietf-pce-lsp-setup-type tells for the stateful PCE case that: "if the path setup type cannot be unambiguously inferred from ERO or any other object or TLV, PATH-SETUP-TYPE TLV MAY be used in PCRpt and PCUpd messages." In our case (PCE initiated) as the LSP has initially been setup through a PCInitiate message having the PST TLV, the PCC can infer that futher updates will use EROs associated with the same PST. Or do we allow to change the PST through PCUpdate messages which may require to always set the PST ? (moving from RSVP-TE to SR or the other way for a particular LSP) I would like to hear opinions of the WG on that problem ? Thanks, Brgds, [Orange logo]<http://www.orange.com/> Stephane Litkowski Network Architect Orange/SCE/EQUANT/OINIS/NET Orange Expert Future Networks phone: +33 2 23 06 49 83 <https://monsi.sso.francetelecom.fr/index.asp?target=http%3A%2F%2Fclicvoice.sso.francetelecom.fr%2FClicvoiceV2%2FToolBar.do%3Faction%3Ddefault%26rootservice%3DSIGNATURE%26to%3D+33%202%2023%2028%2049%2083%20> NEW ! mobile: +33 6 71 63 27 50 <https://monsi.sso.francetelecom.fr/index.asp?target=http%3A%2F%2Fclicvoice.sso.francetelecom.fr%2FClicvoiceV2%2FToolBar.do%3Faction%3Ddefault%26rootservice%3DSIGNATURE%26to%3D+33%206%2037%2086%2097%2052%20> NEW ! stephane.litkow...@orange.com<mailto:stephane.litkow...@orange.com> _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you.
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