Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)
"Jakob Heitz (jheitz)" <jheitz@cisco.com> Tue, 21 July 2020 04:52 UTC
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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Huaimo Chen <huaimo.chen@futurewei.com>, Susan Hares <shares@ndzh.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)
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Date: Tue, 21 Jul 2020 04:52:04 +0000
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Subject: Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020)
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There is an important difference between RPD and Flowspec. https://tools.ietf.org/html/rfc5575#section-6 states: A flow specification NLRI must be validated such that it is considered feasible if and only if: a) The originator of the flow specification matches the originator of the best-match unicast route for the destination prefix embedded in the flow specification. b) There are no more specific unicast routes, when compared with the flow destination prefix, that have been received from a different neighboring AS than the best-match unicast route, which has been determined in step a). Effectively, the advertisement of the route takes the same vector as the advertisement of the matching flowspec. Therefore, if the flowspec did not reach a node, then the route likely didn't either, so it doesn't matter. The fact that BGP is spray and pray doesn't matter, because the route and the flowspec spray to the same places. RPD policy distribution has no such validation rule. SR policy distribution suffers from the same problem. Regards, Jakob. From: Huaimo Chen <huaimo.chen@futurewei.com> Sent: Monday, July 20, 2020 9:01 PM To: Jakob Heitz (jheitz) <jheitz@cisco.com>; Susan Hares <shares@ndzh.com>; idr@ietf.org Subject: Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020) Hi Jakob, Thank you very much for your valuable comments. Our answers/explanations are inline below with prefix [HC]. Best Regards, Huaimo on behalf of co-authors ________________________________ From: Idr <idr-bounces@ietf.org<mailto:idr-bounces@ietf.org>> on behalf of Jakob Heitz (jheitz) <jheitz=40cisco.com@dmarc.ietf.org<mailto:jheitz=40cisco.com@dmarc.ietf.org>> Sent: Thursday, July 16, 2020 9:01 PM To: Susan Hares <shares@ndzh.com<mailto:shares@ndzh.com>>; idr@ietf.org<mailto:idr@ietf.org> <idr@ietf.org<mailto:idr@ietf.org>> Subject: Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020) BGP seems the wrong way to distribute routing policy. [HC]: It seems that BGP flow spec has been used widely to distribute policies for redirecting the traffic. It seems work well without some mechanisms in Netconf. BGP RPD should be similar to BGP flow spec. BGP SR Policy is on the same train. IETF has already defined a way to distribute configuration: Netconf. Netconf provides needed features that BGP does not have: - Atomic Transactions: If one configuration item fails, they all fail. They all either succeed or all fail. There is no partial success. Multiple configurations in one transaction are applied at the same time. . This avoids non-deterministic transient behavior between application of the first policy and the last. - Feedback: BGP is "spray and pray". Netconf provides an acknowledgement that the config either failed or was applied, which then allows the controller to take the next steps with reliable information about what configuration exists in the network. - Persistence: If the BGP session were to go down, all the configuration it sent will be implicitly withdrawn. If another AS would not allow a foreign AS to configure it with netconf, it would not allow it with RPD either. There are already ways in BGP for an AS to signal preference across AS boundaries: Med, AS-path length, communities. [HC]: Netconf can be used to distribute configurations from a controller to the devices in a network. BGP RPD as an alternative option, may have some advantages in some cases. For example, in the case where BGP as a controller, BGP RPD seems more suitable. Using BGP RPD to control/redirect the traffic dynamically in real time may be more effective. Regards, Jakob. From: Idr <idr-bounces@ietf.org<mailto:idr-bounces@ietf.org>> On Behalf Of Susan Hares Sent: Wednesday, July 15, 2020 6:11 AM To: idr@ietf.org<mailto:idr@ietf.org> Subject: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to 7/29/2020) This begins a 2 week WG LC on draft-ietf-idr-rpd from 7/15 to 7/29/2020. You can obtain this draft at: https://datatracker.ietf.org/doc/draft-ietf-idr-rpd/<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-idr-rpd%2F&data=02%7C01%7Chuaimo.chen%40futurewei.com%7C12cf72daefe0446d5a7908d829ed0a36%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637305445341383523&sdata=3LvgG6xwElOv27jGetqpyk8ftRub%2B%2B4Ui31Yt8wN87A%3D&reserved=0> This draft defines a new AFI/SAFI and new atoms for the Wide Communities. This WG LC has been delayed as I waited for a resubmission of the Wide Communities draft. I had hoped to do these 2 WG LC in parallel. I've not received the Wide Communities draft, but we will start this WGLC to provide feedback to the authors. We may have to run a short follow-up to this WG LC If there are changes to the Wide Communities draft during Its WG LC. There is an IPR statement on this draft. In your responses please answer the following questions: 1) Do you feel this draft has an solution that is acceptable With the IPR as a WG RFC? 2) Do you feel this draft is ready to publish? 3) Do you know of implementations of this draft? 4) Do you know of deployments of this draft? If so, is this feature useful in the deploy ments. 5) Do you feel that Wide Communities is ready for Publication? Cheerily, Susan Hares
- [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/15 to… Susan Hares
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Huaimo Chen
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Huaimo Chen
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Yangang
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Zhuangshunwan
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Wanghaibo (Rainsword)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… wangzitao
- [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… Chenshuanglong
- [Idr] 回复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… jasonlu(陆素建)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Ketan Talaulikar (ketant)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Haoyu Song
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Linda Dunbar
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Linda Dunbar
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… reta Yang
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… ruoxin huang
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Wanghaibo (Rainsword)
- [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… Lizhenbin
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Dongjie (Jimmy)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Huzhibo
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Xiejingrong (Jingrong)
- [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… Lizhenbin
- [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… Lizhenbin
- [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… Haoweiguo
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… Ou Liang
- Re: [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt … Gyan Mishra
- Re: [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt … Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Linda Dunbar
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt … Gyan Mishra
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Gyan Mishra
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Wanghaibo (Rainsword)
- Re: [Idr] [GROW] WG LC on draft-ietf-idr-rpd-05.t… Randy Bush
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… chenhuan6@chinatelecom.cn
- Re: [Idr] [GROW] WG LC on draft-ietf-idr-rpd-05.t… Sebastian Becker
- Re: [Idr] [GROW] WG LC on draft-ietf-idr-rpd-05.t… Gert Doering
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Wanghaibo (Rainsword)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Wanghaibo (Rainsword)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Huaimo Chen
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Brian Dickson
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Brendon H
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Zhuangshunwan
- [Idr] 答复: WG LC on draft-ietf-idr-rpd-05.txt (7/1… qinfengwei
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… duzongpeng@foxmail.com
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Ketan Talaulikar (ketant)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Jakob Heitz (jheitz)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Gert Doering
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… zhuyq8
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Zhuangshunwan
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Dongjie (Jimmy)
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Robert Raszuk
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Ignas Bagdonas
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… tony.li
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Huaimo Chen
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Donald Eastlake
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Huaimo Chen
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Huaimo Chen
- Re: [Idr] [GROW] WG LC on draft-ietf-idr-rpd-05.t… Pedro Andres Aranda Gutierrez
- Re: [Idr] WG LC on draft-ietf-idr-rpd-05.txt (7/1… Zhuangshunwan