Hi Giuseppe, thank you for your quick response. I agree with your analysis regarding the IOAM and AltMark marked packets in an IPv6 network. And yes, Synonymous Flow Label can be used in an MPLS network to support the AltMark method. But I am not sure that the solution proposed in draft-gandhi-mpls-ioam is the one that is going to be adopted. I would like to note the ongoing work on the MPLS Network Actions (MNA) in the MPLS WG and the IOAM is considered one of the use cases in draft-ietf-mpls-mna-usecases <https://datatracker.ietf.org/doc/draft-ietf-mpls-mna-usecases/>. It might be that IAOM in MPLS would not be supported using G-ACh but MNA with post-stack data (PSD) approach. If that is the case and since MAN will use the newly assigned base Special Purpose Label (bSPL), a node that does not support MNA will drop the packet when that bSPL is discovered as the top label.
Regards, Greg On Mon, Jul 4, 2022 at 1:27 AM Giuseppe Fioccola < giuseppe.fiocc...@huawei.com> wrote: > Hi Greg, > > Yes, this is the supposed behavior as specified in IOAM and Alt-Mark > documents. > > For IPv6, IOAM and Alt-Mark are encapsulated in option data fields using > extension headers (either HBH or DOH). Both draft-ietf-6man-ipv6-alt-mark > and draft-ietf-ippm-ioam-ipv6-options state that nodes that do not support > the Option must ignore it, according to the procedures of RFC8200. > > For MPLS, it also applies to draft-ietf-mpls-rfc6374-sfl. Looking at > draft-gandhi-mpls-ioam, it is also mentioned that the intermediate node > that is not capable of supporting the IOAM functions can simply skip the > IOAM processing. > > > > Regards, > > > > Giuseppe > > > > *From:* Greg Mirsky <gregimir...@gmail.com> > *Sent:* Saturday, July 2, 2022 4:45 AM > *To:* Giuseppe Fioccola <giuseppe.fiocc...@huawei.com> > *Cc:* wang...@chinatelecom.cn; Dhruv Dhody <d...@dhruvdhody.com>; > pce@ietf.org; draft-chen-pce-pcep-i...@ietf.org > *Subject:* Re: [Pce] WG Adoption of draft-chen-pce-pcep-ifit-06 > > > > Hi Giuseppe, > > I have a question about your statement: > > But if nodes on the path do not support some capabilities, it is not a big > issue. Indeed, both Alternate Marking and IOAM documents specify that nodes > that do not support a specific functionality will forward the packet > without any changes to the data fields and they are simply not considered > in the measurement. > > Is the expectation that a packet marked with IOAM or AltMarking will be > forwarded by a non-supporting node applies to all IETF networking > technologies, for example in an MPLS network? > > > > Regards, > > Greg > > > > On Fri, Jul 1, 2022 at 8:55 AM Giuseppe Fioccola <giuseppe.fioccola= > 40huawei....@dmarc.ietf.org> wrote: > > Hi Aijun, > > Thanks for the support. > > Regarding your question, I think we can clarify this point in the next > version. If a PCE instantiates a path on the PCC with an IFIT capability > enabled, it is supposed that there are at least two nodes (e.g. starting > and ending node) which support it. But if nodes on the path do not support > some capabilities, it is not a big issue. Indeed, both Alternate Marking > and IOAM documents specify that nodes that do not support a specific > functionality will forward the packet without any changes to the data > fields and they are simply not considered in the measurement. > > > > Regards, > > > > Giuseppe > > > > > > *From:* wang...@chinatelecom.cn <wang...@chinatelecom.cn> > *Sent:* Friday, July 1, 2022 11:26 AM > *To:* 'Dhruv Dhody' <d...@dhruvdhody.com>; pce@ietf.org > *Cc:* draft-chen-pce-pcep-i...@ietf.org > *Subject:* 答复: WG Adoption of draft-chen-pce-pcep-ifit-06 > > > > Hi, All: > > > > I support its adoption. > > > > One questions to the authors: > > Is it enough that only the headend support the defined iFIT capabilities? > What’s the procedures when the nodes on the LSP/SR path doesn’t support > the defined iFIT capabilities? > > > > Aijun Wang > > China Telecom > > > > *发件人**:* Dhruv Dhody [mailto:d...@dhruvdhody.com <d...@dhruvdhody.com>] > *发送时间:* 2022年6月24日 16:59 > *收件人:* pce@ietf.org > *抄送:* draft-chen-pce-pcep-i...@ietf.org > *主题:* WG Adoption of draft-chen-pce-pcep-ifit-06 > > > > Hi WG, > > This email begins the WG adoption poll for draft-chen-pce-pcep-ifit-06. > > > > https://datatracker.ietf.org/doc/draft-chen-pce-pcep-ifit/ > > > > Should this draft be adopted by the PCE WG? Please state your reasons - > Why / Why not? What needs to be fixed before or after adoption? Are you > willing to work on this draft? Review comments should be posted to the list. > > Please respond by Monday 11th July 2022. > > > > Please be more vocal during WG polls! > > Thanks! > Dhruv & Julien > > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce >
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