What happens if an operator wants to run both iOAM and GDFH at the same time and the packet is a PW packet?
What does the packet look like and how does the forwarder know what to do? - Stewart > On 22 Feb 2021, at 22:49, Jeffrey (Zhaohui) Zhang <[email protected]> wrote: > > Hi Stewart, > > This thread started with your comment “Please see the note that I sent about > iOAM who also want to sit after BoS … and both of you want the same space > that PALS and DetNet is already using”, but now it seems that we’re on the > same page – GDFH starting with 0000b is fine and is not competing with IOAM > or PW/DETNET CW? > > Thanks. > Jeffrey > > From: Stewart Bryant <[email protected] > <mailto:[email protected]>> > Sent: Monday, February 22, 2021 5:15 AM > To: Jeffrey (Zhaohui) Zhang <[email protected] <mailto:[email protected]>> > Cc: Stewart Bryant <[email protected] > <mailto:[email protected]>>; [email protected] > <mailto:[email protected]>; mpls <[email protected] <mailto:[email protected]>>; > [email protected] <mailto:[email protected]>; Kireeti Kompella <[email protected] > <mailto:[email protected]>>; Ron Bonica <[email protected] > <mailto:[email protected]>>; <[email protected] <mailto:[email protected]>> > <[email protected] <mailto:[email protected]>> > Subject: Re: draft-zzhang-intarea-generic-delivery-functions > > [External Email. Be cautious of content] > > The DetNet CW is described in RFC8964 and is > > > > 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 0| Sequence Number | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > Figure 5: DetNet Control Word > > In all defined control words > > The 0000 is simply ECMP defeat and has no other purpose. > > 0001 means ACH > > An ACH is currently defined not to carry service/user data - it is a > control/OAM channel. > > You cannot assume anything about a payload starting 0000. > > In MPLS the bottom label (alone) defines how you process the payload. So you > know that you have a CW from the bottom label and by no other means. > > In other words the the FEC of the bottom label and its associated parameters > are the way that signalling protocol knows what instructions to give the > forwarder, and the way that the forwarder knows what to do with the packet is > from the instructions associated with the BoS label. This is the universal > model for MPLS including for IP packets. > > Stewart > > > On 19 Feb 2021, at 15:42, Jeffrey (Zhaohui) Zhang <[email protected] > <mailto:[email protected]>> wrote: > > Hi Stewart, > > I still have to read more about DetNet, but I am not sure if there is a real > contention with PALS. > > My understanding of 0000 nibble in PW control world is that it is only to > prevent a transit node from mistaking the payload as IP. Is it supposed to > indicate that any payload starting with 0000 is PW payload? I hope not. > > Use of 0000 nibble in GDFH is also just to prevent transit nodes from > mistaking it as IP. It does indicate it is GDFH. It should be able to > co-exist with PW CW. > > Thanks. > Jeffrey > > -----Original Message----- > From: Jeffrey (Zhaohui) Zhang > Sent: Thursday, February 18, 2021 10:35 PM > To: Stewart Bryant <[email protected] > <mailto:[email protected]>> > Cc: [email protected] <mailto:[email protected]>; mpls <[email protected] > <mailto:[email protected]>>; [email protected] <mailto:[email protected]>; Kireeti > Kompella <[email protected] <mailto:[email protected]>>; Ron Bonica > <[email protected] <mailto:[email protected]>>; <[email protected] > <mailto:[email protected]>> <[email protected] <mailto:[email protected]>> > Subject: RE: draft-zzhang-intarea-generic-delivery-functions > > Stewart, all, > > I apologize for not responding to this in time. I some how accidentally moved > a few wg mailing list email folders to a place where I could not see so I > missed all the discussions. > Let me catch up all the emails and then reply. > > Thanks. > Jeffrey > > -----Original Message----- > From: Stewart Bryant <[email protected] > <mailto:[email protected]>> > Sent: Tuesday, January 12, 2021 9:59 AM > To: Jeffrey (Zhaohui) Zhang <[email protected] <mailto:[email protected]>> > Cc: Stewart Bryant <[email protected] > <mailto:[email protected]>>; [email protected] > <mailto:[email protected]>; mpls <[email protected] <mailto:[email protected]>>; > [email protected] <mailto:[email protected]>; Kireeti Kompella <[email protected] > <mailto:[email protected]>>; Ron Bonica <[email protected] > <mailto:[email protected]>>; <[email protected] <mailto:[email protected]>> > <[email protected] <mailto:[email protected]>> > Subject: Re: draft-zzhang-intarea-generic-delivery-functions > > [External Email. Be cautious of content] > > > Thank you Jeffery > > Please see the note that I sent about iOAM who also want to sit after BoS … > and both of you want the same space that PALS and DetNet is already using. > > We plan to have a joint session on this hosted by PALS at the next IETF, but > I think we also need to include the iOAM people. > > This has scope to get very messy as we find new candidates for BoS metadata > so we really need to take a holistic position to ensure the future health the > MPLS protocol. > > - Stewart > > > > On 12 Jan 2021, at 14:27, Jeffrey (Zhaohui) Zhang <[email protected] > <mailto:[email protected]>> wrote: > > Hi, > > I just posted > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-zzhang-intarea-generic-delivery-functions/__;!!NEt6yMaO-gk!QyBnufJO58LP6Diq96EdYEe2kxFtiItOdNuXbu_RIMekK2pkpOj4Mmj7b9MseV-Y$ > > <https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-zzhang-intarea-generic-delivery-functions/__;!!NEt6yMaO-gk!QyBnufJO58LP6Diq96EdYEe2kxFtiItOdNuXbu_RIMekK2pkpOj4Mmj7b9MseV-Y$> > . > > The initial version was posted to the tsvwg > (https://urldefense.com/v3/__https://tools.ietf.org/html/draft-zzhang-tsvwg-generic-transport-functions-00__;!!NEt6yMaO-gk!QyBnufJO58LP6Diq96EdYEe2kxFtiItOdNuXbu_RIMekK2pkpOj4Mmj7b5lS_Jea$ > > <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-zzhang-tsvwg-generic-transport-functions-00__;!!NEt6yMaO-gk!QyBnufJO58LP6Diq96EdYEe2kxFtiItOdNuXbu_RIMekK2pkpOj4Mmj7b5lS_Jea$> > ). After discussions/feedback we are re-homing it to intarea wg. This new > version also contains quite some changes based on the comments and feedback > that we received (special thanks to Stewart). > > Comments and suggestions are appreciated. > > Thanks. > Jeffrey > > Juniper Business Use Only > > > Juniper Business Use Only > > > Juniper Business Use Only >
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