Sasha, What are you hoping to achieve? That a restarting PCE can retain its TED and LSP-DB? That a restarting PCE can synch state with the network? That a restarting PCE with outstanding (unanswered) messages in either direction can not need to resend them? That a restarting PCE can resend outstanding (unanswered) messages without problems caused by duplication? I think you may want to read around the definition of the request-id. Although 5440 doesn't make it explicit, a lot comes from how you process the request-id. That "a lot" arose from consideration of parallel sessions and distilled to not needing to write about restart. Cheers, Adrian (resurrecting old memories, possibly not entirely accurately) From: Pce [mailto:[email protected]] On Behalf Of Alexander Vainshtein Sent: 18 June 2017 16:43 To: [email protected]; [email protected]; [email protected] Cc: Marina Fizgeer; Michael Gorokhovsky; [email protected]; Alexander Ferdman Subject: Re: [Pce] Is there any activity related to PCE graceful restart? Re-sending with the correct WG mailing list address. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: [email protected] From: Alexander Vainshtein Sent: Sunday, June 18, 2017 6:41 PM To: '[email protected]' <[email protected]>; '[email protected]' <[email protected]>; '[email protected]' <[email protected]> Cc: '[email protected]' <[email protected]>; Michael Gorokhovsky <[email protected]>; Marina Fizgeer <[email protected]>; Alexander Ferdman <[email protected]> Subject: Is there any activity related to PCE graceful restart? Hi all, My colleagues and I tried to find any work in the PCE WG related to PCEP graceful restart. So far, we did not succeed. This could mean one of the following: - Our search did not go deep enough. In this case pointers to any specific documents would be highly appreciated - Such work does not exist because (for some reason) it is not required. This looks problematic to me, especially if we deal with a stateful active PCE and the path computed by the PCE was implemented using Segment Routing (so that only the head end of the computed path is aware of the path). However, I could have missed something obvious, and any clarifications would be highly appreciated - Such work is required but, so far, nobody has taken care of it. The implications are obvious:-(. Your feedback would be highly appreciated. Regards, and lots of thanks in advance, Sasha Office: +972-39266302 Cell: +972-549266302 Email: [email protected]
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