Thanks Dhruv for your clarification. It would be great if more text is added in RFCs regarding the same.
Thanks & Regards, Mrinmoy On Mon, Dec 2, 2024 at 2:39 PM Dhruv Dhody <d...@dhruvdhody.com> wrote: > Hi Mrinmoy, > > On Mon, Dec 2, 2024 at 1:13 PM Mrinmoy Das <mrinmoy.i...@gmail.com> wrote: > >> Hello Team, >> >> I'm going through RFC 5440 to understand PCC's responsibility upon >> receiving PCE Overload notification from PCE. >> >> What I understood is as follows: >> >> *Scenario 1: PCC is connected to multiple PCE:* >> 1. PCC established connections with Primary PCE and all other backup PCEs. >> 2. PCC sends Sync LSPs and PCReq to PCE and everything goes fine. >> 3. PCE sends PCInitiated LSP and everything goes fine. >> 4. Now, PCE sends Overload Notification to PCC. >> >> From step 4 onwards what will be expected execution steps as per RFC >> 5440? >> >> a. If further path computation/reoptimization requirement occurs, PCC >> sends those to the backup PCE? or if there are no further requests from >> PCC, then nothing needs to be done from the PCC side. >> > > Dhruv: For the passive stateful case via PCReq message, that would make > sense! > For the delegated case, see below - > > > >> b. What would be existing delegations? would that need to be re-delegated >> to backup PCE? >> >> > Dhruv: The overloaded PCE will retain the delegation until it is > explicitly revoked. > For the PCC-initiated LSP, PCC is free to revoke delegation as per RFC > 8231 as a local decision. For instance, PCC could do that if the PCE > remains in an overloaded state for a long time. > For the PCE-initiated LSP, PCC cannot revoke delegation as per RFC 8281, > here the overloaded PCE needs to return the delegation to the PCC as a > local decision. For instance, PCE could do that if it remains in an > overloaded state for a long time. > > > >> Please add any further expected behavior/scenario if I missed anything. >> >> > Dhruv: PCC ought to queue in the state reports via PCRpt message to the > PCE, even if it is overloaded. > > The RFC 8231 and RFC 8281 do not talk about overload much, perhaps some > text can be added to the stateful PCE clarification I-D? > > Thanks! > Dhruv (as a WG participant) > > > >> *Scenario 2: PCC is connected to Single PCE:* >> Everything would be the same as per Scenario 1 except PCC will have no >> other option than wait for PCE's availability. >> >> Thanks & Regards, >> Mrinmoy >> _______________________________________________ >> Pce mailing list -- pce@ietf.org >> To unsubscribe send an email to pce-le...@ietf.org >> >
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