Dear all, According to the remark about implementation we got during the WG call for adoption, we would start a new thread to discuss this point. The goal isto prepare the discussion for next IETF meeting and reach a consensusin order to edit revision 2 of the draft.
The stitching label principle requires at least a certain number of modifications in the current PCEP version: a) A new PCE Capability to announce the inter-domain behaviour b) A new PCE Association Group to associate the local paths identifier to the inter-domain identifier c) new PCEP Errors to manage the Stitching Label exchange d) A mechanism to convey the Stitching Label If there is no other choice than to reuse existing PCEP Objects by allocating new code points for modifications a-c,there is several options for point d, which we have tried to list below: d1) Use ERO and RRO in conjunction to new Path Setup code points as described in version 01 of the draft. It is the simplest implementation but as mention by Dhruv, each time a new path enforcement appear, a new PST code point must be allocated. For example, when Segment Routing v6 will be standardized, we must allocate a new Stitching label PST code point for SRv6. d2) Use ERO and ERO in conjunction to a new flag in LSP. Simple as for d1, but need to use the LSP Extended Flag draft as all LSP flags have been already allocated. d3) Same as d2 but find another place for the flag e.g. SRP or LSPA Object. d4) Define a new PCEP sub-Objet TLV within the LSP Object to convey the stitching label. This is more independent but need extra parsing from an implementation point of view. Please, give us your opinion about these different options and don't hesitate to propose others. Regards Olivier on be-half of co-author's _________________________________________________________________________________________________________________________ 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. _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce
