Re: [Idr] Contents of Idr digest draft-ietf-idr-sr-policy-safi-00
Ketan Talaulikar <ketant.ietf@gmail.com> Fri, 16 February 2024 07:33 UTC
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From: Ketan Talaulikar <ketant.ietf@gmail.com>
Date: Fri, 16 Feb 2024 13:03:04 +0530
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To: Abhishek Chakraborty <cabhi@juniper.net>
Cc: "idr@ietf.org" <idr@ietf.org>, "stefano@previdi.net" <stefano@previdi.net>, "cfilsfil@cisco.com" <cfilsfil@cisco.com>, "pamattes@microsoft.com" <pamattes@microsoft.com>, "dhanendra.ietf@gmail.com" <dhanendra.ietf@gmail.com>
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Subject: Re: [Idr] Contents of Idr digest draft-ietf-idr-sr-policy-safi-00
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Hi Abhishek, They are different sub-TLVs and there is nothing in the draft that says they cannot be signaled together. More importantly, this is covered in https://www.rfc-editor.org/rfc/rfc9256.html#name-binding-sid In the case of SR-MPLS, SRv6 BSIDs (e.g., with the behavior End.BM [RFC8986 <https://www.rfc-editor.org/rfc/rfc9256.html#RFC8986>]) MAY be associated with the SR Policy in addition to the MPLS BSID. In the case of SRv6, multiple SRv6 BSIDs (e.g., with different behaviors like End.B6.Encaps and End.B6.Encaps.Red [RFC8986 <https://www.rfc-editor.org/rfc/rfc9256.html#RFC8986>]) MAY be associated with the SR Policy. Thanks, Ketan On Fri, Feb 16, 2024 at 12:41 PM Abhishek Chakraborty <cabhi@juniper.net> wrote: > Hi Ketan, > > "KT> Doesn't the same section 2.4.2 recommend use of the SRv6 Binding SID > sub-TLV for such cases? And doesn't section 2.4.3 allow multiple SRv6 > Binding SID sub-TLVs?" > > CABHI> The draft talks about multiple SRv6 Binding SID. But it doesn't > talk about the co-existence of a Binding SID TLV and SRV6 Binding SID TLV > for the same policy. I was talking about that use case. > > Best Regards, > Abhishek > > Juniper Business Use Only > ------------------------------ > *From:* Ketan Talaulikar <ketant.ietf@gmail.com> > *Sent:* Thursday, February 15, 2024 22:48 > *To:* Abhishek Chakraborty <cabhi@juniper.net> > *Cc:* idr@ietf.org <idr@ietf.org>; stefano@previdi.net < > stefano@previdi.net>; cfilsfil@cisco.com <cfilsfil@cisco.com>; > pamattes@microsoft.com <pamattes@microsoft.com>; dhanendra.ietf@gmail.com > <dhanendra.ietf@gmail.com> > *Subject:* Re: Contents of Idr digest draft-ietf-idr-sr-policy-safi-00 > > > [External Email. Be cautious of content] > > Hi Abhishek, > > Please check inline for responses. > > > On Fri, Feb 16, 2024 at 12:09 PM Abhishek Chakraborty <cabhi@juniper.net> > wrote: > > Hi Ketan, > > The below statement: > > "The Binding SID sub-TLV is optional and it MUST NOT appear more than once > in the SR Policy encoding." > > There can be a scenario of an SR-MPLS policy have a MPLS Label Binding SID > and also an END.BM > <https://urldefense.com/v3/__http://END.BM__;!!NEt6yMaO-gk!GkifL4OjeTvSv-hdf3eG2cVQCip-DvQnSFM0J6lEgO_eKrVblXXZLwgPT-SQXO4L1D9FJdJzkv9x6psVmA4$> > Binding SID. In that case there can be 2 BSID TLVs right? > > > KT> Doesn't the same section 2.4.2 recommend use of the SRv6 Binding SID > sub-TLV for such cases? And doesn't section 2.4.3 allow multiple SRv6 > Binding SID sub-TLVs? > > Thanks, > Ketan > > > > Best Regards, > Abhishek > > > Juniper Business Use Only > ------------------------------ > *From:* Abhishek Chakraborty <cabhi@juniper.net> > *Sent:* Thursday, February 15, 2024 21:00 > *To:* Ketan Talaulikar <ketant.ietf@gmail.com> > *Cc:* idr@ietf.org <idr@ietf.org>; stefano@previdi.net < > stefano@previdi.net>; cfilsfil@cisco.com <cfilsfil@cisco.com>; > pamattes@microsoft.com <pamattes@microsoft.com>; dhanendra.ietf@gmail.com > <dhanendra.ietf@gmail.com> > *Subject:* Re: Contents of Idr digest draft-ietf-idr-sr-policy-safi-00 > > Hi Ketan, > > Yes, this is one more approach to skip a BSID TLV and expect the SRPM on > the router to allocate one BSID. The method is outside the scope of this > document. > But in this case there can be 2 behaviors from the controller: > > 1. The controller doesn't want a BSID and how does it indicate the > router to remove it in the next update. Since the control of this Candidate > Path is with the controller, do you think in this approach there should be > a way to remove the BSID? > 2. The controller wants to override the router allocated BSID with a > value it wants. Then the controller can send a BSID TLV with a value > different than the allocated value. Then the SRPM on the router can > override the value with controller's value. Now, here if we need to > fallback to the router allocated value again, does the controller send the > Next Update without BSID TLV? > > May be specifying these behaviors make it clear on BSID allocation. > > Best Regards, > Abhishek > ------------------------------ > *From:* Ketan Talaulikar <ketant.ietf@gmail.com> > *Sent:* Thursday, February 15, 2024 20:48 > *To:* Abhishek Chakraborty <cabhi@juniper.net> > *Cc:* idr@ietf.org <idr@ietf.org>; stefano@previdi.net < > stefano@previdi.net>; cfilsfil@cisco.com <cfilsfil@cisco.com>; > pamattes@microsoft.com <pamattes@microsoft.com>; dhanendra.ietf@gmail.com > <dhanendra.ietf@gmail.com> > *Subject:* Re: Contents of Idr digest draft-ietf-idr-sr-policy-safi-00 > > *[External Email. Be cautious of content]* > > Hi Abhishek, > > The Binding SID sub-TLV is optional and can be skipped. This indicates > that the controller is not specifying a BSID and nor is it indicating a > behavior like "drop-upon-invalid". In this case, per RFC9256, the SRPM on > the router will do the BSID allocation. > > Do we really need any flag? If this was not evident, then perhaps we can > add text to section 2.4.2 to clarify this. > > Thanks, > Ketan > > > On Fri, Feb 16, 2024 at 9:40 AM Abhishek Chakraborty <cabhi@juniper.net> > wrote: > > Hi Ketan, > > The binding sid section can we modify with additional flag to request a > node to allocate a bsid? It can be a small section added. > > I see 2 approaches: > 1st approach: > Flag: > 0 1 2 3 4 5 6 7 > +-+-+-+-+-+-+-+-+ > |S|I| D | > +-+-+-+-+-+-+-+-+ > > Figure 5: Binding SID Flags > > The D flag with a BSID TLV with an empty BSID value indicates the router > to dynamically allocate a BSID. > > For flag approach update section 6.6. > > 2nd approach: > No need of new flag. An BSID TLV without any flag set and empty BSID value > indicates that the router allocates the BSID. > > The next update MUST come with the router allocated BSID learnt by > controller through various method outside the scope of this document. > If the controller sent the next update: > > 1. At any given point of time the controller wants to remove the > router allocated BSID, MUST send an update with no BSID TLV. > 2. At any given point of time the controller wants to change the > router allocated BSID, MUST send an update with a specified BSID. > > > > Best Regards, > Abhishek > > Get Outlook for Android > <https://urldefense.com/v3/__https://aka.ms/AAb9ysg__;!!NEt6yMaO-gk!GgJnf55kHDAOoUFb8ZLFk1Dm0ZUliZK7vt7uuSFL9VZ7RlMKCCXfoYp8l2WiMKsLXNhAMwqT5sxACW1jud0$> > > > Juniper Business Use Only > ------------------------------ > *From:* Ketan Talaulikar <ketant.ietf@gmail.com> > *Sent:* Thursday, February 15, 2024 7:47:30 PM > *To:* Abhishek Chakraborty <cabhi@juniper.net> > *Cc:* idr@ietf.org <idr@ietf.org>; stefano@previdi.net < > stefano@previdi.net>; cfilsfil@cisco.com <cfilsfil@cisco.com>; > pamattes@microsoft.com <pamattes@microsoft.com>; dhanendra.ietf@gmail.com > <dhanendra.ietf@gmail.com> > *Subject:* Re: Contents of Idr digest draft-ietf-idr-sr-policy-safi-00 > > *[External Email. Be cautious of content]* > > Hi Abhishek, > > Thanks for your review and your suggestions. > > Most of your comments seem of the nature of additions/augmentation to this > document to me. Would you agree? If so, I would rather that these > extensions be done via other/new documents (there are already many of them > out there with extensions for this SAFI). > > To give some context, this document started as an individual draft in Oct > 2015, became WG draft in Jul 2017 and underwent 26+1 versions during its WG > life of almost 6 years. I hope that the WG wants to "ship it" at this point > after fixing issues (if any) with the current content. > > That said, please check inline below for some pointers. > > > On Fri, Feb 16, 2024 at 4:36 AM Abhishek Chakraborty <cabhi@juniper.net> > wrote: > > > Hello Authors, > > Please find my comments on the draft draft-ietf-idr-sr-policy-safi-00: > > 1. > https://datatracker.ietf.org/doc/html/draft-ietf-idr-sr-policy-safi-00#section-2.4.4 > <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-idr-sr-policy-safi-00*section-2.4.4__;Iw!!NEt6yMaO-gk!F8b91Rwalo0GPEm6nQi7voD8yzDQxR9549mPA-ypUHqOuQB8p0cVkhakk3RqnRPQYulYWnlUn_axe_pN-j0$> > > 1. A segment-list sub-tlv can carry its path-id or a segment-list id > that can be used in various use cases. One example is telemetry. I believe > the Yang Data Model of a segment-list also has a segment-list ID > associated. This ID can be reported via BGP-LS to the controller. > > KT> Please check > https://datatracker.ietf.org/doc/draft-ietf-idr-sr-policy-seglist-id/ > <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-idr-sr-policy-seglist-id/__;!!NEt6yMaO-gk!F8b91Rwalo0GPEm6nQi7voD8yzDQxR9549mPA-ypUHqOuQB8p0cVkhakk3RqnRPQYulYWnlUn_axROHJu2M$> > > > > 1. To be in sync with PCEP multipath draft > https://datatracker.ietf.org/doc/html/draft-ietf-pce-multipath-10 > <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-pce-multipath-10__;!!NEt6yMaO-gk!F8b91Rwalo0GPEm6nQi7voD8yzDQxR9549mPA-ypUHqOuQB8p0cVkhakk3RqnRPQYulYWnlUn_axNtd4IMQ$> can > we include the TLVs to advertise: > > 1. The backup Path for a segment-list sub tlv. This would help in > many use cases to steer the traffic to a backup path when the primary > segment-list is unreachable/down. The path ID or segment list ID > introduction will help distinguish and map a backup path to its primary > path. > 2. The reverse path or opposite direction PATH sub tlv which can > be used by SRPM. > 1. A new metric Sub TLV addition: > 1. A metric sub tlv to indicate on what metric the Candidate Path is > optimized or computed against. > 1. Use case: > 1. This metric can be advertised in BGP MED or can be used for > BGP best path selection. > > KT> Please check > https://datatracker.ietf.org/doc/draft-ietf-idr-sr-policy-metric/ > <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-idr-sr-policy-metric/__;!!NEt6yMaO-gk!F8b91Rwalo0GPEm6nQi7voD8yzDQxR9549mPA-ypUHqOuQB8p0cVkhakk3RqnRPQYulYWnlUn_axnsurlKI$> > > > Thanks, > Ketan > > > 1. Introduction of a new flag in > https://datatracker.ietf.org/doc/html/draft-ietf-idr-segment-routing-te-policy-26#name-binding-sid-sub-tlv > <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-idr-segment-routing-te-policy-26*name-binding-sid-sub-tlv__;Iw!!NEt6yMaO-gk!F8b91Rwalo0GPEm6nQi7voD8yzDQxR9549mPA-ypUHqOuQB8p0cVkhakk3RqnRPQYulYWnlUn_ax1D89LDw$> > : > 1. to indicate the node or router to allocate a Binding SID. In some > cases, the controller may want the node to allocate the Binding SID for the > Candidate Path depending on: > > 1. Already available Active Binding SID for that SR policy. > 1. Example: > 1. PCEP Candidate Path CP1 for Policy P1 requests Binding SID > as per draft > https://datatracker.ietf.org/doc/html/draft-ietf-pce-binding-label-sid-16 > <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-pce-binding-label-sid-16__;!!NEt6yMaO-gk!F8b91Rwalo0GPEm6nQi7voD8yzDQxR9549mPA-ypUHqOuQB8p0cVkhakk3RqnRPQYulYWnlUn_ax17bWE5I$>. > A dynamic BSID is allocated say B1. > > 2. BGP-SRTE path requests the router to allocate a dynamic > Binding SID for CP2 of policy P1. Router allocates the same Binding SID B1. > This helps is fallback cases. > 2. The availability of Binding SID from a range that the > node or router knows. > > > Thanks, and Regards, > Abhishek > > > > 1. > > > > Juniper Business Use Only > ------------------------------ > *From:* Idr <idr-bounces@ietf.org> on behalf of idr-request@ietf.org < > idr-request@ietf.org> > *Sent:* Thursday, February 15, 2024 14:13 > *To:* idr@ietf.org <idr@ietf.org> > *Subject:* Idr Digest, Vol 238, Issue 9 > > [External Email. Be cautious of content] > > > Send Idr mailing list submissions to > idr@ietf.org > > To subscribe or unsubscribe via the World Wide Web, visit > > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/idr__;!!NEt6yMaO-gk!A8KeEuSXmXw9FFOwEIQ5GoLbmfkZXHoQOPINOBhAJU3-QvyE17S9oiRA2no6iRHVxMAuB_jn_tZK8fo4EyA$ > or, via email, send a message with subject or body 'help' to > idr-request@ietf.org > > You can reach the person managing the list at > idr-owner@ietf.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Idr digest..." > > > Today's Topics: > > 1. WG LC on draft-ietf-idr-sr-policy-safi-00 and > draft-ietf-idr-bgp-sr-segtypes-ext-02 (2/15/2024 to 2/29/2024) > (Susan Hares) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 15 Feb 2024 22:12:55 +0000 > From: Susan Hares <shares@ndzh.com> > To: "idr@ietf.org" <idr@ietf.org> > Subject: [Idr] WG LC on draft-ietf-idr-sr-policy-safi-00 and > draft-ietf-idr-bgp-sr-segtypes-ext-02 (2/15/2024 to 2/29/2024) > Message-ID: > < > DM6PR08MB48572F86EA48D3FDB532EA21B34D2@DM6PR08MB4857.namprd08.prod.outlook.com > > > > Content-Type: text/plain; charset="us-ascii" > > Greetings IDR: > > This begins a 2-week WG LC on the following two drafts created from the > text in > draft-ietf-idr-segment-routing-te-policy-18 - that the IDR WG approved for > publication: > > > * draft-ietf-idr-sr-policy-safi-00 (proposed standard) > > > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-idr-sr-policy-safi/__;!!NEt6yMaO-gk!A8KeEuSXmXw9FFOwEIQ5GoLbmfkZXHoQOPINOBhAJU3-QvyE17S9oiRA2no6iRHVxMAuB_jn_tZK0K-D6Q8$ > > * draft-ietf-idr-bgp-sr-segtypes-ext-02 (experimental) > > > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-sr-segtypes-ext/__;!!NEt6yMaO-gk!A8KeEuSXmXw9FFOwEIQ5GoLbmfkZXHoQOPINOBhAJU3-QvyE17S9oiRA2no6iRHVxMAuB_jn_tZKMrsVAu8$ > > The Authors (per IETF policy) are asked to respond to this message with a > message indicating whether they know of any undisclosed IPR as the > documents stand now. > Please note there are 3 IPR declarations on these drafts. > > History: > ====== > After reviewing draft-ietf-idr-segment-routing-te-policy-18, Andrew Alston > (IDR RTG AD) > asked that draft-ietf-idr-segment-routing-te-policy be split into two > parts because > some segment types (C-L) did not have two implementations. > Therefore, draft-ietf-idr-bgp-srsegtypes-ext-02 contains the text for > Segment types C-L. This split has been discussed at IETF meetings. > > Since Andrew Alston had personally implemented this draft, > he also asked for additional reviews on procedures. > > During this review, the procedures regarding the link to RFC9012 were > improved. > > Issues in call: > ============ > During the WG should note that the procedures specified in > draft-ietf-idr-sr-policy-safi-00 do the following: > > > 1. Only apply to the SR Policy Tunnel (15) + SR Policy SAFI > 2. Do not require any of the TLVs defined in RFC9012 for other tunnel > types > 3. May ignore TLVs defined in RFC9012 for other tunnel types > 4. Do not use the validation process in RFC9012, and depend on the SRPM > to validate content. > 5. Makes changes to Color Extended Community [RFC9012] to add to 2-bits > [C, O] > > To support "color-only" (CO) functions of section 8.8 of [RFC9256] > > > C0 - type 0 (00) - Specific end-point match (Match endpoint that is BGP NH) > type 1 (01) - Specific or null end-point match (BGP NH or null > (default gw)) > type 2 (10) - Specific, null, or any end-point match (BGP NH, > Null, or any endpoint) > type 3 (11) - Reserved > > The SR Policy Tunnel functions in this draft use BGP as a transport > mechanism for the > Information contained in the SR Policy. > > Please note that these procedures split the context validation away from > the > BGP module into the SRPM module. This split is similar to the BGP-LS > split > syntax validation from context validation. > > There are multiple implementations of this technology as detailed at: > > https://urldefense.com/v3/__https://wiki.ietf.org/group/idr/BGP-Implementation-report/draft-ietf-idr-segment-routing-te-policy-implement__;!!NEt6yMaO-gk!A8KeEuSXmXw9FFOwEIQ5GoLbmfkZXHoQOPINOBhAJU3-QvyE17S9oiRA2no6iRHVxMAuB_jn_tZKoZPXAok$ > > The WG members are asked to confirm their agreement to the changes made in > this document. > > If there are questions, please ask them on this mail thread. Please note > any errors in the call are mine (and not the authors). > > Cheerily, Sue > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://urldefense.com/v3/__https://mailarchive.ietf.org/arch/browse/idr/attachments/20240215/9c1e0641/attachment.htm__;!!NEt6yMaO-gk!A8KeEuSXmXw9FFOwEIQ5GoLbmfkZXHoQOPINOBhAJU3-QvyE17S9oiRA2no6iRHVxMAuB_jn_tZK0bmhsvo$ > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Idr mailing list > Idr@ietf.org > > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/idr__;!!NEt6yMaO-gk!A8KeEuSXmXw9FFOwEIQ5GoLbmfkZXHoQOPINOBhAJU3-QvyE17S9oiRA2no6iRHVxMAuB_jn_tZK8fo4EyA$ > > > ------------------------------ > > End of Idr Digest, Vol 238, Issue 9 > *********************************** > > >
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Abhishek Chakraborty
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Ketan Talaulikar
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Abhishek Chakraborty
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Abhishek Chakraborty
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Ketan Talaulikar
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Abhishek Chakraborty
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Abhishek Chakraborty
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Ketan Talaulikar
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Abhishek Chakraborty
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Ketan Talaulikar
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Abhishek Chakraborty
- Re: [Idr] Contents of Idr digest draft-ietf-idr-s… Ketan Talaulikar