Hi, Luc:
Let’s take the Figure 2 in https://datatracker.ietf.org/doc/html/draft-wang-bess-l3-accessible-evpn-08# name-introduction as one example: The branches of customer C(C-A or C-B) that located under respective MAN want to communicate with each other, via the layer 2 domain. The communication between different branches should be isolated. “MAN(Metro Area Network)” is the layer 3 network of the service provider. “Backbone” is backbone network of the service provider The customer C buy the EVPN layer 2 service(Let’s call it EVPN C) at the “Backbone” of the service provider. It wants its branches connect to its EVPN layer 2 service(EVPN C), then it should use one VxLAN tunnel service to connect the sites to their corresponding PE devices. Let’s call the tunnel identifier as LSI(Logical Service Identifier). The LSI can be used to differentiate the traffic from different branches(C-A, or C-B). Within the backbone of the service provider, there is VNI(for EVPN C) that allocated to customer C, but there is no place to transmit the information about their different branches(C-A, or C-B). Then, we need to expand the encoding of VxLAN encapsulation, to include such information, to achieve the similar effect of QinQ for VLAN, and also the extension of the related control plane. For the extension of VxLAN encapsulation, it is necessary to ask the approve from the NVO3 WG, but I think the requirements should be first confirmed within BESS WG. We will add the reference to draft-ietf-nvo3-vxlan-gpe in next version. Wish the above explanation can give you some helps. Best Regards Aijun Wang China Telecom 发件人: Luc André Burdet [mailto:laburdet.i...@gmail.com] 发送时间: 2025年3月4日 23:37 收件人: Aijun Wang <wangai...@tsinghua.org.cn>; bess@ietf.org 抄送: 'Haibo Wang' <rainsword.w...@huawei.com>; 'Wei Wang' <weiwan...@foxmail.com> 主题: Re: [bess] 答复: New Version Notification for draft-wang-bess-l3-accessible-evpn-08.txt Hi Aijun, I have difficulty with the problem you are trying to solve, could you expand on that section a little ? Other than that, shouldn’t this document go through NVO3 first, to define the dataplane aspects of extending VxLAN-GPE? Once dataplane is defined, it can (separately) move through BESS for signaling aspects. The document doesn’t refer to draft-ietf-nvo3-vxlan-gpe - this should be a normative reference if you are extending vxlan-gpe. Regards, Luc André Luc André Burdet | Cisco | laburdet.i...@gmail.com <mailto:laburdet.i...@gmail.com> | Tel: +1 613 254 4814 From: Aijun Wang <wangai...@tsinghua.org.cn <mailto:wangai...@tsinghua.org.cn> > Date: Friday, February 28, 2025 at 05:02 To: bess@ietf.org <mailto:bess@ietf.org> <bess@ietf.org <mailto:bess@ietf.org> > Cc: 'Haibo Wang' <rainsword.w...@huawei.com <mailto:rainsword.w...@huawei.com> >, 'Wei Wang' <weiwan...@foxmail.com <mailto:weiwan...@foxmail.com> > Subject: [bess] 答复: New Version Notification for draft-wang-bess-l3-accessible-evpn-08.txt Hi, All experts: After several rounds offline discussions about the previous version of this document, with our Chair, Jeffery Zhang, we updated again the related descriptions, to reflect the converged conclusions. We would like to seek more broader reviews of this document and get some constructive comments to forward it. We have also applied one time slot on the coming IETF 122 meeting to make one presentation. If the time slot is granted, let's discuss it further on the meeting, or after the meeting. Please take some time to review it https://datatracker.ietf.org/doc/html/draft-wang-bess-l3-accessible-evpn If you are familiar with the layer 2 access interface(VLAN based, VLAN bundle, VLAN awared) of EVPN(RFC 7432), then it is easy to understand the aim and solution of this draft. Thanks in advance for your efforts! And thank also Jeffrey Zhang for the discussions to improve the document. Best Regards Aijun Wang China Telecom -----邮件原件----- 发件人: internet-dra...@ietf.org <mailto:internet-dra...@ietf.org> [mailto:internet-dra...@ietf.org] 发送时间: 2025年2月28日 17:04 收件人: Aijun Wang <wang...@chinatelecom.cn <mailto:wang...@chinatelecom.cn> >; Haibo Wang <rainsword.w...@huawei.com <mailto:rainsword.w...@huawei.com> >; Wei Wang <weiwan...@foxmail.com <mailto:weiwan...@foxmail.com> > 主题: New Version Notification for draft-wang-bess-l3-accessible-evpn-08.txt A new version of Internet-Draft draft-wang-bess-l3-accessible-evpn-08.txt has been successfully submitted by Aijun Wang and posted to the IETF repository. Name: draft-wang-bess-l3-accessible-evpn Revision: 08 Title: Layer-3 Accessible EVPN Services Date: 2025-02-28 Group: Individual Submission Pages: 11 URL: https://www.ietf.org/archive/id/draft-wang-bess-l3-accessible-evpn-08.txt Status: https://datatracker.ietf.org/doc/draft-wang-bess-l3-accessible-evpn/ HTMLized: https://datatracker.ietf.org/doc/html/draft-wang-bess-l3-accessible-evpn Diff: https://author-tools.ietf.org/iddiff?url2=draft-wang-bess-l3-accessible-evpn -08 Abstract: This draft describes layer-3 accessible EVPN service interfaces, which aim is to connect the layer 2 customers to one EVPN backbone, via the layer 3 network, and keep the traffic isolation among different layer 2 customers. It proposes to extend the VxLAN packet format to transfer the customer's Virtual Network Identifier(VNI) information, and also the related control plane extension. 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