Re: [Detnet] Regarding the model for Active OAM packet
Greg Mirsky <gregimirsky@gmail.com> Fri, 21 September 2018 15:24 UTC
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 21 Sep 2018 08:23:59 -0700
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To: Loa Andersson <loa@pi.nu>
Cc: Mach Chen <mach.chen@huawei.com>, DetNet WG <detnet@ietf.org>, János Farkas <Janos.Farkas@ericsson.com>, detnet-chairs@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/WnEFAyx0Lth3cTOQRnNzSgXpUpA>
Subject: Re: [Detnet] Regarding the model for Active OAM packet
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Hi Loa, you've asked how a node identifies that the payload is ACH, not CW. As I understand RFC 4385, it is by the value of the first nibble that follows BoS label. ACH assigned value 0b0001, PW CW - 0b0000. 0b0100 defines IPv4, and 0b0110 - IPv6. Regards, Greg On Fri, Sep 21, 2018 at 3:55 AM Loa Andersson <loa@pi.nu> wrote: > Mach, > > inline please > > On 2018-09-21 18:31, Mach Chen wrote: > > Hi Loa, > > > > New ACH type is fine, this is also needed for DetNet OAM, IMHO. The > crucial here is how to "cheat" the replication/elimination nodes that an > OAM packet is a "normal" DetNet packet, then they can replicate/eliminate > the OAM packets as normal DetNet packets. Otherwise, it needs to introduce > additional replication/elimination processing for the DetNet OAM packets. > > > > To support this, I suggest to use ACH without GAL (of cause, a new > ACH-type) for DetNet OAM (as bellow) and the "reserved" field carries > sequence number information, the "ACH" can be considered as the d-CW by the > replication/elimination nodes. > > +----------+ > > |S-Label | > > +----------+ > > |ACH | > > +----------+ > > | Payload| > > +----------+ > > > what info do a node use to understand that the ACH is an ACH?? > > /Loa > > If GAL is used ( the stack as below), additional processing has to be > introduced at the replication/elimination nodes, because they have to parse > GAL+ACH to decide how to process. That means, the OAM packets will have > different replication/elimination process from the normal DetNet packets. > > > > +----------+ > > |S-Label | > > +----------+ > > |GAL | > > +----------+ > > |ACH | > > +----------+ > > | Payload| > > +----------+ > > > > Best regards, > > Mach > > > >> -----Original Message----- > >> From: Loa Andersson [mailto:loa@pi.nu] > >> Sent: Friday, September 21, 2018 4:49 PM > >> To: Mach Chen <mach.chen@huawei.com>; Greg Mirsky > >> <gregimirsky@gmail.com> > >> Cc: DetNet WG <detnet@ietf.org>; János Farkas > >> <Janos.Farkas@ericsson.com>; detnet-chairs@ietf.org > >> Subject: Re: [Detnet] Regarding the model for Active OAM packet > >> > >> Mach, > >> > >> Admittedly I'm not up to speed on DetNet OAM, but ..... > >> > >> The ACH is specified like this: > >> > >> 0 1 2 3 > >> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >> |0 0 0 1|Version| Reserved | Channel Type | > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >> > >> you can define 65k ACH-types, what stops you from defining a ACH channel > >> type for DetNet OAM, then define that the structure of the following > octets > >> in a way that you see fit (like (yes I'm inventing as I type, more > thoughts > >> should go into to this): > >> > >> 0 1 2 3 > >> 0123 45678901 234567890123 45678901 > >> +----+--------+------------+--------+ > >> | R | LEN | relevant info | > >> +----+--------+------------+--------+ > >> |0000| d-CW | > >> +----+--------+------------+--------+ > >> | more relevant info | > >> +----+--------+------------+--------+ > >> > >> > >> What is that I'm missing? > >> > >> /Loa > >> > >> On 2018-09-21 14:22, Mach Chen wrote: > >>> Hi Loa, > >>> > >>> Can you clarify how a new ACH-type can address the problem? > >>> > >>> Best regards, > >>> Mach > >>> > >>>> -----Original Message----- > >>>> From: Loa Andersson [mailto:loa@pi.nu] > >>>> Sent: Thursday, September 20, 2018 6:14 PM > >>>> To: Mach Chen <mach.chen@huawei.com>; Greg Mirsky > >>>> <gregimirsky@gmail.com> > >>>> Cc: DetNet WG <detnet@ietf.org>; János Farkas > >>>> <Janos.Farkas@ericsson.com>; detnet-chairs@ietf.org > >>>> Subject: Re: [Detnet] Regarding the model for Active OAM packet > >>>> > >>>> Mach, > >>>> > >>>> I'd like Stewart or Matthew to look at this, but as I understand it > >>>> it is possible to define a new ACH-type that can do exactly what you > want. > >>>> > >>>> /Loa > >>>> > >>>> On 2018-09-20 17:58, Mach Chen wrote: > >>>>> Loa, > >>>>> > >>>>> GAL is just an OAM indicator, the problem here is that when do > >>>>> DetNet > >>>> OAM, the d-CW will replaced by ACH or by GAL+ACH. No matter which > >> way > >>>> is used, to support the replication or elimination, there has to be a > >>>> sequence number filed. But ACH (as its current defined) does not have > >> such a field. > >>>>> > >>>>> My suggestion is to use the reserved field of ACH to carry sequence > >>>> number of OAM packet, and for those replication or elimination > >>>> nodes, they do not have to differentiate whether a packet is OAM > >>>> packet or a normal packet, they could just treat the right 28 bits of > >>>> the ACH as the sequence number ( or treat the ACH as the d-CW), then > >>>> both OAM and replication/elimination can be supported. > >>>>> > >>>>> Best regards, > >>>>> Mach > >>>>> > >>>>>> -----Original Message----- > >>>>>> From: detnet [mailto:detnet-bounces@ietf.org] On Behalf Of Loa > >>>>>> Andersson > >>>>>> Sent: Thursday, September 20, 2018 3:21 PM > >>>>>> To: Mach Chen <mach.chen@huawei.com>; Greg Mirsky > >>>>>> <gregimirsky@gmail.com> > >>>>>> Cc: DetNet WG <detnet@ietf.org>; János Farkas > >>>>>> <Janos.Farkas@ericsson.com>; detnet-chairs@ietf.org > >>>>>> Subject: Re: [Detnet] Regarding the model for Active OAM packet > >>>>>> > >>>>>> Mach, > >>>>>> > >>>>>> If I understand you correctly this is for an LSP in an MPLS > >>>>>> network, can you help me understand why GAL does not enough. > >> Given > >>>>>> that there might be some minor extensions to GAL because of > >>>>>> replication and > >>>> elimination. > >>>>>> > >>>>>> /Loa > >>>>>> > >>>>>> On 2018-09-19 14:31, Mach Chen wrote: > >>>>>>> Hi Greg, > >>>>>>> > >>>>>>> Indeed, there is no DetNet Associated Channel defined in > >>>>>>> draft-ietf-detnet-dp-sol-mpls for now, I think there should be. I > >>>>>>> also assume that PW ACH will be used for DetNet OAM. > >>>>>>> > >>>>>>> Assume that PW ACH will be used for DetNet OAM and the reserved > >>>>>>> filed of the PW ACH will be used to carry sequence number for OAM > >>>> packet. > >>>>>>> But > >>>>>>> for PREF, a tricky way is to treat the “Version”+ “Reserved” + > >>>>>>> ”Channel type” as the Sequence number, the replication or > >>>>>>> elimination nodes do not need to differentiate whether it is a > >>>>>>> d-CW or a > >>>> PW ACH . > >>>>>>> This way, OAM can be supported without additional processing and > >>>> states. > >>>>>>> > >>>>>>> 0 1 2 > >>>>>>> 3 > >>>>>>> > >>>>>>> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 > >>>>>>> 8 9 > >>>>>>> 0 > >>>>>>> 1 > >>>>>>> > >>>>>>> > >>>>>>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >>>>>>> > >>>>>>> |0 0 0 1|Verion | Reserved | Channel Type > >>>>>>> | > >>>>>>> > >>>>>>> > >>>>>>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >>>>>>> > >>>>>>> Regarding sequence number, there are two ways to generate the > >>>>>> sequence > >>>>>>> number IMHO: 1) generated by the edge node, but it may need to > >>>>>>> configure the start number, or 2) copied from the application-flow > >>>>>>> (if there is). If the WG agree with this, the model can be updated > >>>>>>> reflect this. > >>>>>>> > >>>>>>> Best regards, > >>>>>>> > >>>>>>> Mach > >>>>>>> > >>>>>>> *From:*Greg Mirsky [mailto:gregimirsky@gmail.com] > >>>>>>> *Sent:* Wednesday, September 19, 2018 11:29 AM > >>>>>>> *To:* Mach Chen <mach.chen@huawei.com> > >>>>>>> *Cc:* János Farkas <Janos.Farkas@ericsson.com>; DetNet WG > >>>>>>> <detnet@ietf.org>; detnet-chairs@ietf.org > >>>>>>> *Subject:* Re: Regarding the model for Active OAM packet > >>>>>>> > >>>>>>> Hi Mach, > >>>>>>> > >>>>>>> thank you for your attention to my comment and the most expedient > >>>>>> response. > >>>>>>> > >>>>>>> I don't find the DetNet Associated Channel defined in > >>>>>>> draft-ietf-detnet-dp-sol-mpls and thus I assumed that OAM packets > >>>>>>> that follow the data packet encapsulation defined in that draft > >>>>>>> use PW ACH as defined in section 5 RFC 4385: True, it includes 8 > >>>>>>> bits-long Reserved field that may be defined as OAM Sequence > >>>>>>> Number but that > >>>>>> had > >>>>>>> not been discussed. One is certain, existing nodes do not check > >>>>>>> the Reserved field. And without a field to hold the sequence > >>>>>>> number, PREF will not handle the OAM packets. Another question, > >>>>>>> additional processing and amount of state introduced in the fast > >>>>>>> path by the fact that OAM's Sequence Number will have different > >>>>>>> length and location in d-CW (differentiating cases by the first > nibble). > >>>>>>> > >>>>>>> Now, if we step back from DetnNet in MPLS data plane > >>>>>>> encapsulation, why the control-word, as I understand, is > >>>>>>> configurable? I think that the Sequence Number is not > >>>>>>> configurable, nor the first nibble. What do you think? > >>>>>>> > >>>>>>> Regards, > >>>>>>> > >>>>>>> Greg > >>>>>>> > >>>>>>> On Tue, Sep 18, 2018 at 7:48 PM Mach Chen > >> <mach.chen@huawei.com > >>>>>>> <mailto:mach.chen@huawei.com>> wrote: > >>>>>>> > >>>>>>> Hi Greg, > >>>>>>> > >>>>>>> The MPLS DetNet header is defined as below: > >>>>>>> > >>>>>>> grouping mpls-detnet-header { > >>>>>>> description > >>>>>>> "The MPLS DetNet encapsulation header > information."; > >>>>>>> leaf service-label { > >>>>>>> type uint32; > >>>>>>> mandatory true; > >>>>>>> description > >>>>>>> "The service label of the DetNet header."; > >>>>>>> } > >>>>>>> leaf control-word { > >>>>>>> type uint32; > >>>>>>> mandatory true; > >>>>>>> description > >>>>>>> "The control word of the DetNet header."; > >>>>>>> } > >>>>>>> } > >>>>>>> > >>>>>>> Although do not consider Active OAM when design the above > >>>>>>> mpls-denet-header, seems that it can cover Active OAM case > as > >> well. > >>>>>>> No matter a normal DetNet packet or an Active OAM packet, > there > >>>>>>> should be a CW field, just as defined above. > >>>>>>> > >>>>>>> For normal DetNet packets, the CW is the d-CW as defined in > the > >>>>>>> draft-ietf-detnet-dp-sol-mpls. > >>>>>>> > >>>>>>> For OAM packets, the CW is the "DetNet Associated Channel". > >>>>>>> > >>>>>>> Best regards, > >>>>>>> Mach > >>>>>>> > >>>>>>> > >>>>>>> > -----Original Message----- > >>>>>>> > From: detnet [mailto:detnet-bounces@ietf.org > >>>>>>> <mailto:detnet- > >>>>>> bounces@ietf.org>] On Behalf > >>>>>>> Of Greg Mirsky > >>>>>>> > Sent: Wednesday, September 19, 2018 3:17 AM > >>>>>>> > To: János Farkas <Janos.Farkas@ericsson.com > >>>>>> <mailto:Janos.Farkas@ericsson.com>> > >>>>>>> > Cc: DetNet WG <detnet@ietf.org <mailto:detnet@ietf.org>>; > >>>>>>> detnet- > >>>>>> chairs@ietf.org > >>>>>>> <mailto:detnet-chairs@ietf.org> > >>>>>>> > Subject: Re: [Detnet] WG adoption poll > >>>>>>> draft-geng-detnet-conf- > >>>> yang > >>>>>>> > > >>>>>>> > Hi Janos, et. al, > >>>>>>> > the mpls-detnet-header container is based on the solution > >>>> described in > >>>>>>> > draft-ietf-detnet-dp-sol-mpls. Analysis of active SFC OAM > >>>>>>> in the > >>>>>> proposed > >>>>>>> > MPLS data plane solution in draft-mirsky-detnet-oam points > >>>>>>> to the > >>>>>> potential > >>>>>>> > problem as result the fact that OAM packet doesn't include > >>>>>>> d-CW. I > >>>>>> believe > >>>>>>> > that this question should be discussed and, if we agree on > >>>>>>> the > >>>> problem > >>>>>>> > statement, properly resolved. Until then, I do not support > >>>>>>> the adoption > >>>>>> of > >>>>>>> > the model that may not be capable to support active OAM. > >>>>>>> > > >>>>>>> > Regards, > >>>>>>> > Greg > >>>>>>> > On Tue, Sep 18, 2018 at 12:03 PM Janos Farkas > >>>>>> <Janos.Farkas@ericsson.com <mailto:Janos.Farkas@ericsson.com>> > >>>>>>> > wrote: > >>>>>>> > > > >>>>>>> > > Dear all, > >>>>>>> > > > >>>>>>> > > This is start of a two week poll on making > >>>>>>> > > draft-geng-detnet-conf-yang-04 a working group document. > >>>>>>> Please > >>>>>> send > >>>>>>> > > email to the list indicating "yes/support" or "no/do not > >>>> support". If > >>>>>>> > > indicating no, please state your reservations with the > >>>> document. If > >>>>>>> > > yes, please also feel free to provide comments you'd > like to see > >>>>>>> > > addressed once the document is a WG document. > >>>>>>> > > > >>>>>>> > > The poll ends Oct 3. > >>>>>>> > > > >>>>>>> > > Thanks, > >>>>>>> > > János and Lou > >>>>>>> > > > >>>>>>> > > _______________________________________________ > >>>>>>> > > detnet mailing list > >>>>>>> > > detnet@ietf.org <mailto:detnet@ietf.org> > >>>>>>> > > https://www.ietf.org/mailman/listinfo/detnet > >>>>>>> > > >>>>>>> > _______________________________________________ > >>>>>>> > detnet mailing list > >>>>>>> > detnet@ietf.org <mailto:detnet@ietf.org> > >>>>>>> > https://www.ietf.org/mailman/listinfo/detnet > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>>> _______________________________________________ > >>>>>>> detnet mailing list > >>>>>>> detnet@ietf.org > >>>>>>> https://www.ietf.org/mailman/listinfo/detnet > >>>>>>> > >>>>>> > >>>>>> -- > >>>>>> > >>>>>> > >>>>>> Loa Andersson email: loa@pi.nu > >>>>>> Senior MPLS Expert > >>>>>> Bronze Dragon Consulting phone: +46 739 81 21 64 > >>>>>> > >>>>>> _______________________________________________ > >>>>>> detnet mailing list > >>>>>> detnet@ietf.org > >>>>>> https://www.ietf.org/mailman/listinfo/detnet > >>>>> _______________________________________________ > >>>>> detnet mailing list > >>>>> detnet@ietf.org > >>>>> https://www.ietf.org/mailman/listinfo/detnet > >>>>> > >>>> > >>>> -- > >>>> > >>>> > >>>> Loa Andersson email: loa@pi.nu > >>>> Senior MPLS Expert > >>>> Bronze Dragon Consulting phone: +46 739 81 21 64 > >> > >> -- > >> > >> > >> Loa Andersson email: loa@pi.nu > >> Senior MPLS Expert > >> Bronze Dragon Consulting phone: +46 739 81 21 64 > > _______________________________________________ > > detnet mailing list > > detnet@ietf.org > > https://www.ietf.org/mailman/listinfo/detnet > > > > -- > > > Loa Andersson email: loa@pi.nu > Senior MPLS Expert > Bronze Dragon Consulting phone: +46 739 81 21 64 >
- [Detnet] Regarding the model for Active OAM packet Mach Chen
- Re: [Detnet] Regarding the model for Active OAM p… Greg Mirsky
- Re: [Detnet] Regarding the model for Active OAM p… Mach Chen
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Mach Chen
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Greg Mirsky
- Re: [Detnet] Regarding the model for Active OAM p… Mach Chen
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Mach Chen
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Greg Mirsky
- Re: [Detnet] Regarding the model for Active OAM p… Greg Mirsky
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Greg Mirsky
- Re: [Detnet] Regarding the model for Active OAM p… Loa Andersson
- Re: [Detnet] Regarding the model for Active OAM p… Greg Mirsky
- Re: [Detnet] Regarding the model for Active OAM p… Mach Chen