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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM8PR11MB5719.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 577fa704-fd06-415e-b36a-08da1ca7afb1 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Apr 2022 17:12:55.8340 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: OvMAPgulJd/uKvctTW88indR2i/ErpFs4XIzijTp4K3eusfcjvobzZpC/uQstNTXxSGcKlQXh/xKFtfPYUqf1g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR11MB5521 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.227.253, xfe-rcd-005.cisco.com X-Outbound-Node: rcdn-core-4.cisco.com Archived-At: Subject: Re: [ippm] FW: New Version Notification for draft-filsfils-spring-path-tracing-00.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Apr 2022 17:13:06 -0000 Hi Ruediger, Many thanks for your email. Glad you appreciate the PT proposal for SRv6 ne= tworks. We have experimental implementation at linerate in Broadcom Jericho 2, Cisc= o Silicon One, Marvell Prestera, and Cisco ASR9k (as well of opensource sof= tware). It would be great to hear from other vendors whether they can proce= ss this at linerate as well. With regards to the SR-MPLS draft, we are finalizing the text and we will p= ost it soon for feedback. With regards to the time-synchronization considerations, many thanks on you= r feedback. We agree with you, and we'll add more considerations in the nex= t revision. Thanks, Pablo. -----Original Message----- From: Ruediger.Geib@telekom.de =20 Sent: viernes, 1 de abril de 2022 11:12 To: ahabdels=3D40cisco.com@dmarc.ietf.org Cc: spring@ietf.org; ippm@ietf.org; draft-filsfils-spring-path-tracing@ietf= .org Subject: [ippm] FW: New Version Notification for draft-filsfils-spring-path= -tracing-00.txt Hi Ahmed, Thanks for the draft. I appreciate the small and well specified format of t= he measurement and hope that endpoints and transit routers supporting Path = Tracing in SRv6 networks are able to fill in the specified fields at linera= te during forwarding. I'd also appreciate an SR-MPLS version of the draft. I'd suggest to add more text related to the following statement: Note: all routers across the network MUST have time- synchronization. The mechanism used for time synchronization is out of the scope of this draft. An operator should be able to qualify an applicable time-synchronisation by= guidance of the draft. If Truncated Timestamp configuration depends on the= precision of time synchronization, guidance for interested operators shoul= d be part of the draft. The choice of timestamp resolution may further depe= nd on locally configured buffers. A Truncated Timestamp working well in the= absence of congestion, but creating erroneous information with the onset o= f congestion might not be desired. Maybe a discussion on wrapping / overflo= w may help too. Finally, the precision of the synchronization needs to be m= onitored. That may be done out of band, but centralized processing should = be aware of timestamps created by a router with (temporarily) bad synch. A = temporal change in precision of or a loss of synch are common networking s= ynch-events. While the mechanism used for time synchronization doesn't need to be define= d in the draft, a reference to some applicable synchronization mechanisms w= ould be helpful. The list doesn't have to be complete, please add some comm= odity examples. Editorial nit: To me, a binding "Requirement" shouldn't be a "Note". Regards, Ruediger On Wed, Mar 9, 2022 at 4:14 PM Ahmed Abdelsalam (ahabdels) wrote: > > Dear SPRING WG, IPPM WG, > > We have submitted a new I-D for Path Tracing in SRv6 networks (https://da= tatracker.ietf.org/doc/html/draft-filsfils-spring-path-tracing) to SPRING W= G. > We are looking for your feedback and comments. > Path Tracing provides a record of the packet path as a sequence of interf= ace ids. In addition, it provides a record of end-to-end delay, per-hop del= ay, and load on each egress interface along the packet delivery path to fac= ilitate operation of SR networks. > > > > Path Tracing allows to trace 14 hops with only a 40-octet IPv6 Hop-by-Hop= extension header. > > > We will present Path Tracing to the SPRING WG at next IETF > (https://datatracker.ietf.org/meeting/113/materials/agenda-113-spring- > 00.txt) > > > > Thanks, > > Ahmed > > > > From: internet-drafts@ietf.org > Date: Friday, 4 March 2022 at 16:48 > To: Ahmed Abdelsalam (ahabdels) , cf(mailer list)=20 > , Mark Yufit , Pablo Camarillo > (pcamaril) , Pablo Camarillo (pcamaril)=20 > , Satoru Matsushima=20 > , Thomas.Graf=20 > , Yuanchao Su > Subject: New Version Notification for=20 > draft-filsfils-spring-path-tracing-00.txt > > > A new version of I-D, draft-filsfils-spring-path-tracing-00.txt > has been successfully submitted by Pablo Camarillo Garvia and posted=20 > to the IETF repository. > > Name: draft-filsfils-spring-path-tracing > Revision: 00 > Title: Path Tracing in SRv6 networks > Document date: 2022-03-04 > Group: Individual Submission > Pages: 15 > URL: https://www.ietf.org/archive/id/draft-filsfils-spring-pat= h-tracing-00.txt > Status: https://datatracker.ietf.org/doc/draft-filsfils-spring-pa= th-tracing/ > Htmlized: https://datatracker.ietf.org/doc/html/draft-filsfils-spri= ng-path-tracing > > > Abstract: > Path Tracing provides a record of the packet path as a sequence of > interface ids. In addition, it provides a record of end-to-end > delay, per-hop delay, and load on each egress interface along the > packet delivery path. > > Path Tracing allows to trace 14 hops with only a 40-bytes IPv6 Hop- > by-Hop extension header. > > Path Tracing supports fine grained timestamp. It has been designed > for linerate hardware implementation in the base pipeline. > > > > > The IETF Secretariat > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm _______________________________________________ ippm mailing list ippm@ietf.org https://www.ietf.org/mailman/listinfo/ippm