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Thu, 30 Nov 2023 02:01:48 +0000 From: "Jeffrey (Zhaohui) Zhang" To: John Scudder , The IESG CC: "draft-ietf-bier-evpn@ietf.org" , "bier-chairs@ietf.org" , "bier@ietf.org" , "mankamis@cisco.com" Thread-Topic: John Scudder's No Objection on draft-ietf-bier-evpn-11: (with COMMENT) Thread-Index: AQHaInEFWkoseWe2Nk+SUkapDN8HobCR2LSA Date: Thu, 30 Nov 2023 02:01:48 +0000 Message-ID: References: <170122717301.11719.17104341214716762832@ietfa.amsl.com> In-Reply-To: <170122717301.11719.17104341214716762832@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=32195cbb-dc91-409a-bc37-1bea1d4ef2c6; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ContentBits=0; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2023-11-29T21:55:41Z; 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charset="utf-7" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: IA1PR05MB9550.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 35f7533e-50ea-4ba7-8645-08dbf1485009 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Nov 2023 02:01:48.5675 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: jQNLMfyFM9wEwuRxen7J4v02ocLg8wtpLVh2qhk3WYoqo1IAifkf+igPD3G6LtwjiWxJ8ZnQkAmTGRi9tpOVsg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR05MB8272 X-Proofpoint-ORIG-GUID: I5lsP4V9hiPwfacyKF4KoH2SAr8H-nJK X-Proofpoint-GUID: I5lsP4V9hiPwfacyKF4KoH2SAr8H-nJK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-29_21,2023-11-29_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 clxscore=1015 suspectscore=0 mlxscore=0 lowpriorityscore=0 malwarescore=0 phishscore=0 priorityscore=1501 spamscore=0 adultscore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311300013 Archived-At: Subject: Re: [Bier] John Scudder's No Objection on draft-ietf-bier-evpn-11: (with COMMENT) X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 30 Nov 2023 02:01:58 -0000 Hi John, Thanks for your review and comments+ACE- I posted the -12 revision that add= ress comments from you, Warren, and Zaheduzzaman: https://author-tools.ietf= .org/iddiff?url1+AD0-draft-ietf-bier-evpn-11+ACY-url2+AD0-draft-ietf-bier-e= vpn-12+ACY-difftype+AD0---html Please see zzh+AD4- below for some clarifications. If I don't say anything = about a comment, it means it's been fixed as you suggested. Juniper Business Use Only -----Original Message----- From: John Scudder via Datatracker +ADw-noreply+AEA-ietf.org+AD4- Sent: Tuesday, November 28, 2023 10:06 PM To: The IESG +ADw-iesg+AEA-ietf.org+AD4- Cc: draft-ietf-bier-evpn+AEA-ietf.org+ADs- bier-chairs+AEA-ietf.org+ADs- bi= er+AEA-ietf.org+ADs- mankamis+AEA-cisco.com+ADs- mankamis+AEA-cisco.com Subject: John Scudder's No Objection on draft-ietf-bier-evpn-11: (with COMM= ENT) +AFs-External Email. Be cautious of content+AF0- John Scudder has entered the following ballot position for draft-ietf-bier-evpn-11: No Objection When responding, please keep the subject line intact and reply to all email= addresses included in the To and CC lines. (Feel free to cut this introduc= tory paragraph, however.) Please refer to https://urldefense.com/v3/+AF8AXw-https://www.ietf.org/abou= t/groups/iesg/statements/handling-ballot-positions/+AF8AXwA7ACEAIQ-NEt6yMaO= -gk+ACE-BvDIszB2LMoegy8Nm-CGMImTzct3kwWAjkELszv8ZDt5m7EwRHJaIA22y8L-DGErmA1= xx8CNuEnqWko+ACQ- for more information about how to handle DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://urldefense.com/v3/+AF8AXw-https://datatracker.ietf.org/doc/draft-ie= tf-bier-evpn/+AF8AXwA7ACEAIQ-NEt6yMaO-gk+ACE-BvDIszB2LMoegy8Nm-CGMImTzct3kw= WAjkELszv8ZDt5m7EwRHJaIA22y8L-DGErmA1xx8CN000u8uE+ACQ- ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- +ACM- John Scudder, RTG AD, comments for draft-ietf-bier-evpn-11 CC +AEA-jg= scudder Thanks for this document. As usual with multicast documents, I largely am t= aking it on faith that the authors and WG know what they're doing, but I st= ill have a few non-blocking comments, below. +ACMAIw- COMMENTS +ACMAIwAj- Section 1.1 - You define +ACI-AC+ACI-, but only use it once, IMO the definition isn't n= eeded in this case (for that matter the abbreviation isn't needed in Sectio= n 2.2.2.1, you can just use your words). - +ACI-Sets of C-flows can be identified by the use of the +ACI-C-+ACoAIg- = wildcard+ACI- -- I wonder if +ACI-denoted+ACI- would be a better term than = +ACI-identified+ACI- in this context. - +ACI-A multicast tunnel through the network of one or more SPs+ACI- -- pr= esumably by +ACI-SPs+ACI- you mean +ACI-service providers+ACI-. Probably be= tter to write it out. +ACMAIwAj- Section 2.2.1 I can't understand what this sentence means: +ACI-Only when selectively for= warding is for all flows without tunnel segmentation, SMET routes are used = without the need for S-PMSI A-D routes.+ACI- Specifically, I can't parse th= e first clause. I would propose a rewrite if I had a solid guess as to what= it meant, but alas. Zzh+AD4- Perhaps adding an +ACI-and+ACI- would help? +ACI-Only when selecti= vely forwarding is for all flows +ACo-and+ACo- without tunnel segmentation+= ACI- - if selective forwarding is used only for some flows, or if tunnel se= gmentation is used then we have to use S-PMSI routes together with SMET rou= tes. +ACMAIwAj- Section 2.2.2.1 I'm guessing that when you write, +ACI-It may be desired that SMET routes a= re not used to reduce the burden of explicit tracking+ACI-, what you mean i= s +ACI-It may be desired that SMET routes are not used, in order to reduce = the burden of explicit tracking+ACI-? Zzh+AD4- Yes. (See also https://urldefense.com/v3/+AF8AXw-https://en.wikipedia.org/wiki/E= ats,+AF8-Shoots+AF8AKg-26+AF8-Leaves+AF8AXwA7-JQ+ACEAIQ-NEt6yMaO-gk+ACE-BvD= IszB2LMoegy8Nm-CGMImTzct3kwWAjkELszv8ZDt5m7EwRHJaIA22y8L-DGErmA1xx8CN7filEx= 4+ACQ- ) +ACMAIwAj- Section 3 Please expand +ACI-DF+ACI-. +ACMAIwAj- Section 4.1.1, best match I trust/hope that other documents in the BIER/EVPN/MVPN set clearly define = what +ACI-best match+ACI- means in this context. It's not intuitively obvio= us what things like +ACI-best match the source and destination IP address+A= CI- mean, absent a definition. Zzh+AD4- The SMET and S-PMSI route all have source/group address fields. Th= e match is based on that. I added +ACI-whose source and group address field= s+ACI-. +ACMAIwAj- Section 4.1.2 +ACI-Each instance of the re-advertised route for a downstream region has a= PTA that specifies tunnel information that is the same as or different fro= m that of the route for a different region.+ACI- Possibly this is just my lack of expertise in the subject area and apprecia= tion for your subtlety, but I don't see how the second half of the sentence= conveys any information. Couldn't you rewrite it as +ACI-Each instance of = the re-advertised route for a downstream region has a PTA.+ACI-? Zzh+AD4- I guess I was just trying to say that the tunnel information for d= ifferent downstream regions may be different or the same. I see your point = - I changed it to +ACI-... a PTA that specifies the tunnel for that region.= +ACI- Thanks+ACE- Jeffrey +ACMAIw- Notes This review is in the +AFsAIg-IETF Comments+ACI- Markdown format+AF0AWw-ICM= F+AF0-, You can use the +AFsAYA-ietf-comments+AGA- tool+AF0AWw-ICT+AF0- to = automatically convert this review into individual GitHub issues. +AFs-ICMF+AF0-: https://urldefense.com/v3/+AF8AXw-https://github.com/mnot/i= etf-comments/blob/main/format.md+AF8AXwA7ACEAIQ-NEt6yMaO-gk+ACE-BvDIszB2LMo= egy8Nm-CGMImTzct3kwWAjkELszv8ZDt5m7EwRHJaIA22y8L-DGErmA1xx8CNXrwcMOA+ACQ- +AFs-ICT+AF0-: https://urldefense.com/v3/+AF8AXw-https://github.com/mnot/ie= tf-comments+AF8AXwA7ACEAIQ-NEt6yMaO-gk+ACE-BvDIszB2LMoegy8Nm-CGMImTzct3kwWA= jkELszv8ZDt5m7EwRHJaIA22y8L-DGErmA1xx8CNf-0Wo80+ACQ-