Peter, draft-ietf-lsr-flex-algo-17 currently has registered Algorithm Types 128-255 with IANA. If we need to add a new Algorithm Type, e.g. using a weighted value of a Stub Link property in calculating the shortest path, do we need to use one of the value within 128-255 or need to ask IANA to assign one of the values within 2-127 (currently shown unassigned on IANA page)?
Linda Dunbar -----Original Message----- From: Lsr <lsr-boun...@ietf.org> On Behalf Of Peter Psenak Sent: Thursday, September 9, 2021 7:52 AM To: bruno.decra...@orange.com; lsr@ietf.org Subject: Re: [Lsr] draft-ietf-lsr-flex-algo Hi Bruno, On 09/09/2021 14:43, bruno.decra...@orange.com wrote: > Hi authors, all, > > I have a question related to the two-way connectivity check performed on each > link during the FlexAlgo SPF. flex-algo is defined as set of: (a) calculation-type (b) metric-type, (c) a set of constraints Two way connectivity check for any link in the MT topology is orthogonal to flex-algo and is done once only and used for all algorithms. Flex-algo calculation using (a), (b), and (c) is done on top of MT topology using only links for which the 2WCC has already been performed. > > Is this point documented in the document? I could not find it so far. > If not, what is the (reverse connectivity) check that need to be performed on > the reverse link? none. thanks, Peter > > A priori I could see multiple options: > a) link exist > b) link exist with a standard IGP metric (seem the option defined in the ISO > spec §7.2.8.2) > c) link exist with the FlexAlgo metric used by FlexAlgo > d) link exist with the FlexAlgo metric used by FlexAlgo and link complies to > FlexAlgo constraints. > > I think we'll agree that this point requires uniformity across nodes hence > standardization. > > Personally, I don't have significant preference, but the algo defined in §13 > "Calculation of Flexible Algorithm Paths" could be read as defining option > "d" (as links not following the constraints are "pruned from the > computation") but I'm not sure that this is intended for the two-way > connectivity check. > > Thanks, > Regards, > --Bruno > > > > _________________________________________________________________________________________________________________________ > > 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. > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Flsr&data=04%7C01%7Clinda.dunbar%40futurewei.com%7C2504ea39e2e94976a95908d97390b485%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637667887645570581%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=bHrwW7VJ2L1SXk6Jz%2BXZRW9%2FRUB9Z8BpqzLI6fXyeBA%3D&reserved=0 > > _______________________________________________ Lsr mailing list Lsr@ietf.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Flsr&data=04%7C01%7Clinda.dunbar%40futurewei.com%7C2504ea39e2e94976a95908d97390b485%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637667887645570581%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=bHrwW7VJ2L1SXk6Jz%2BXZRW9%2FRUB9Z8BpqzLI6fXyeBA%3D&reserved=0 _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr
