Thanks Jon. From: Jonathan Hardwick [mailto:jonathan.hardw...@metaswitch.com] Sent: Thursday, November 16, 2017 11:51 To: LITKOWSKI Stephane OBS/OINIS; pce@ietf.org Subject: RE: Clarifications on PST handling in draft-ietf-pce-lsp-setup-type & draft-ietf-pce-segment-routing
Hi Stephane OK, let's go with solution (2). That is, if the PATH-SETUP-TYPE is not present in a message, then it unambiguously means that the path setup type is RSVP-TE. Then implementations don't have to try to infer the path setup type from other objects or previous messages. I am revising draft-ietf-pce-lsp-setup-type at the moment to address an earlier comment from Julien, so I will include this clarification in the next revision. Thanks for the input! Cheers Jon From: stephane.litkow...@orange.com<mailto:stephane.litkow...@orange.com> [mailto:stephane.litkow...@orange.com] Sent: 15 November 2017 13:52 To: Jonathan Hardwick <jonathan.hardw...@metaswitch.com<mailto:jonathan.hardw...@metaswitch.com>>; pce@ietf.org<mailto:pce@ietf.org> Subject: RE: Clarifications on PST handling in draft-ietf-pce-lsp-setup-type & draft-ietf-pce-segment-routing Hi Jon, Thanks for your feedback. I see two possibilities here. 1. When the PATH-SETUP-TYPE is not present in a PCUpd, it should be inferred from the latest one received (in a PCInitiate or in a PCUpd). When initiating an LSP, the PCInitiate contains the PST to let the PCC know about the path type. Then, it can be omitted in further PCUpd except when the PCE wants to change the path type. At that time, it sends a PCUpd with a new PATH-SETUP-TYPE value and then it does not need to include it in further updates until the PCE needs to change it again. 2. We mandate the PCE to put the PATH-SETUP-TYPE in all PCUpd. IMO, solution 2) is easier for implementations and operation. Brgd, Stephane From: Jonathan Hardwick [mailto:jonathan.hardw...@metaswitch.com] Sent: Wednesday, November 15, 2017 09:28 To: LITKOWSKI Stephane OBS/OINIS; pce@ietf.org<mailto:pce@ietf.org> Subject: RE: Clarifications on PST handling in draft-ietf-pce-lsp-setup-type & draft-ietf-pce-segment-routing I think it should be acceptable for the PCUpd not to include the PATH-SETUP-TYPE, with the implication that there is no change to the path type. Although I'm not convinced it would be a good idea operationally, I don't think there's any need to prevent the path type changing on the PCUpd, if an explicit PATH-SETUP-TYPE is given. That is, draft-ietf-pce-lsp-setup-type, as a base draft, should allow that flexibility. A given device may choose not to allow that, of course. Does that sound reasonable? Cheers Jon From: Pce [mailto:pce-boun...@ietf.org] On Behalf Of stephane.litkow...@orange.com<mailto:stephane.litkow...@orange.com> Sent: 14 November 2017 00:38 To: pce@ietf.org<mailto:pce@ietf.org> Subject: [Pce] Clarifications on PST handling in draft-ietf-pce-lsp-setup-type & draft-ietf-pce-segment-routing 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. 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