Hi, Peter： Different data planes use different Flex-Algorithm and associated metric, they can’t be mixed. Or, would you like to point out why the following scenarios can’t be achieved via the FAPM? 1) The PE router has three loopback addresses(Lo1-Lo3), each associated with different Flex-ALgorithhms, and also different metrics. They are advertised via the FAPM, no MPLS SIDs are associated with these loopack prefixes advertisements. 2) The PE router has also another inter-area/inter-domain prefixes(IPextra), with the FAPM and MPLS SID advertised via the prefixes advertisements.
When the PE in other ends want to send the traffic to theses addresses: 1) To the formers three destinations(Lo1-Lo3), the FIB that are formed by the associated FAPM will be used, that is, the IP-based forwarding will be selected. 2) To the Inter-area/inter-domain prefixes the FIB that are formed via the FAPM and the associated SID, the MPLS-based forwarding will be selected. Why can’t they coexist? Aijun Wang China Telecom > On May 3, 2022, at 16:05, Peter Psenak <[email protected]> > wrote: > > Aijun, > >> On 03/05/2022 09:59, Aijun Wang wrote: >> Hi, Peter: >> The definition of FAPM for IS-IS and OSPF doesn’t prevent from it is used >> for the intra-area prefixes. >> If we advertise the different loopback addresses via the FAPM, associate >> them to different Flex-Algo and related metrics, and does not allocate the >> MPLS SID, we can achieve the IP-Flex effect then. > > as I said, we can not mix metrics for different data-planes. > >> So, what’s the additional value of the IP-Flexalgo draft then? > > please read the draft. It defines the flex-algo for IP data plane. > > thanks, > Peter > > > >> Aijun Wang >> China Telecom >>>> On May 3, 2022, at 14:46, Peter Psenak >>>> <[email protected]> wrote: >>> >>> Aijun, >>> >>>> On 03/05/2022 00:47, Aijun Wang wrote: >>>> Hi, Acee: >>>> The questions raised at >>>> https://mailarchive.ietf.org/arch/msg/lsr/RlHphXCwxMbgGvcBV_m24xiDzS0/ >>>> <https://mailarchive.ietf.org/arch/msg/lsr/RlHphXCwxMbgGvcBV_m24xiDzS0/> >>>> has not been answered. >>> >>> IS-IS Flexible Algorithm Prefix Metric Sub-TLV” and “OSPF Flexible >>> Algorithm Prefix Metric Sub-TLV” are defined for advertisement of algorithm >>> specific metric for inter-area inter-AS prefixes for SR-MPLS data-plane. >>> >>> SR MPLS and IP are independent data-planes used for flex-algo. We can not >>> mix their metric. >>> >>> thanks, >>> Peter >>> >>>> Aijun Wang >>>> China Telecom >>>>>> On May 2, 2022, at 23:00, Acee Lindem (acee) >>>>>> <[email protected]> wrote: >>>>> >>>>> The WG last call has completed. We will submit an updated version of the >>>>> document for publication with the terminology changes based on the >>>>> discussion amongst the authors, Ketan, Robert, Gyan, and others. >>>>> >>>>> Thanks, >>>>> Acee >>>>> >>>>> *From: *Lsr <[email protected]> on behalf of "Acee Lindem (acee)" >>>>> <[email protected]> >>>>> *Date: *Thursday, April 7, 2022 at 3:07 PM >>>>> *To: *"[email protected]" <[email protected]> >>>>> *Cc: *"[email protected]" >>>>> <[email protected]> >>>>> *Subject: *[Lsr] Working Group Last Call for >>>>> draft-ietf-lsr-ip-flexalgo-04 - "IGP Flexible Algorithms (Flex-Algorithm) >>>>> In IP Networks" >>>>> >>>>> This begins a WG last call for draft-ietf-lsr-ip-flexalgo-04. The draft >>>>> had a lot of support and discussion initially and has been stable for >>>>> some time. Please review and send your comments, support, or objection to >>>>> this list before 12 AM UTC on April 22^nd , 2022. >>>>> >>>>> Thanks, >>>>> Acee >>>>> >>>>> _______________________________________________ >>>>> Lsr mailing list >>>>> [email protected] >>>>> https://www.ietf.org/mailman/listinfo/lsr >>> > _______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr
