[Idr] 答复: 答复: 答复: WG Adoption call for draft-wang-idr-bgpls-inter-as-topology-ext-02.txt (10/4/2018 to 10/18/2018)
"Aijun Wang" <wangaijun@tsinghua.org.cn> Wed, 10 October 2018 03:21 UTC
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From: Aijun Wang <wangaijun@tsinghua.org.cn>
To: "'Ketan Talaulikar (ketant)'" <ketant@cisco.com>, "'Dongjie (Jimmy)'" <jie.dong@huawei.com>, 'Susan Hares' <shares@ndzh.com>, idr@ietf.org
Cc: draft-wang-idr-bgpls-inter-as-topology-ext@ietf.org
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Subject: [Idr] 答复: 答复: 答复: WG Adoption call for draft-wang-idr-bgpls-inter-as-topology-ext-02.txt (10/4/2018 to 10/18/2018)
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Hi, Ketan: Thanks for your supports and comments. I replied to the detail issues inline below, please refer them for our current considerations. On summary, there may be several options to accomplish the requirements, we will try to find the most suitable way, based on the implementation experience of BGP-LS protocol, from Cisco and other vendors in future. Wish to get more helps, comments, contribution from you and other experts on this draft. Best Regards. Aijun Wang Network R&D and Operation Support Department China Telecom Corporation Limited Beijing Research Institute,Beijing, China. ·¢¼þÈË: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com] ·¢ËÍʱ¼ä: 2018Äê10ÔÂ9ÈÕ 15:13 ÊÕ¼þÈË: Aijun Wang; 'Dongjie (Jimmy)'; 'Susan Hares'; idr@ietf.org ³ËÍ: draft-wang-idr-bgpls-inter-as-topology-ext@ietf.org Ö÷Ìâ: RE: [Idr] ´ð¸´: ´ð¸´: WG Adoption call for draft-wang-idr-bgpls-inter-as-topology-ext-02.txt (10/4/2018 to 10/18/2018) Hi Aijun, I support the requirement for this draft to cover the Inter-AS links advertisement via BGP-LS which was left out by RFC 7752 (https://tools.ietf. org/html/rfc7752#section-3.5). However, I have the following suggestions and comments. 1) The Inter-AS TE scenario is more straight forward and well-defined be covered by this draft. But I would propose that such a link be encoded by re-using existing TLVs as also suggested by Jie. The details can be worked out, if you agree on the premise of re-use. [Aijun Wang]: The primary aim that we use different TLVs is to distinguish these inter-as links easily from the internal links that the original IGP/BGP-LS advertise. One possible approach is to define one new NLRI(for example inter-AS link NLRI) and reuses the existing the TLV; or we reuse the existing Link NLRI, but use different TLVs. If we do not take such approaches, then it is not easy for the controller to filter the inter-as links from BGP-LS report information. This is similar requirements as described in RFC5316 <https://tools.ietf.org/html/rfc5316> (inter-AS TE for ISIS) and RFC5392 <https://tools.ietf.org/html/rfc5392> (inter-AS TE for OSPF) 2) For the Inter-AS ¡°Native IP¡± scenario, the draft proposes to use the Prefix NLRI corresponding to the redistributed Inter-AS link subnet to derive (or construct) the Inter-AS link topology. I find this problematic due to follows: a. Are all redistributed/external routes now going to get assumed to be Inter-AS links? This generalization is not correct. [Aijun Wang] You are right. Not every redistributed/external routes be inter-as links. To exclude the possible exception, we can tag the redistributed inter-AS links, distinguish them from the other redistributed prefixes. This is general administration issues. We can add this in the updated version of this draft. b. I do not understand how the inter-AS link is going to get ¡°derived¡± from this prefix ¨C it is just the prefix subnet without any information of the remote node AS or link identifier information (which is what we have in case (1) above as well as when using BGP EPE). [Aijun Wang] I have described the retrieval process at the present slide <https://datatracker.ietf.org/meeting/102/materials/slides-102-idr-sessb-bgp -ls-extend-for-inter-as-topology-retrieval-00> in IETF 102 meeting. Will this be help to you to grasp its essence? Anyway, the controller has more capability to retrieval the inter-as topology based on the additional report information via BGP-LS. We can discuss its applicable scenarios later in detail. In summary, I support the adoption for the signalling for Inter-AS TE links (with suggestion to re-use existing TLVs). But I don¡¯t support the use-case/scenario (2) which is being described as it would break the existing BGP-LS functionality for signalling of external/redistribute prefixes by implying that they are all Inter-AS links. Thanks, Ketan From: Idr <idr-bounces@ietf.org> On Behalf Of Aijun Wang Sent: 09 October 2018 07:34 To: 'Dongjie (Jimmy)' <jie.dong@huawei.com>; 'Susan Hares' <shares@ndzh.com>; idr@ietf.org Cc: draft-wang-idr-bgpls-inter-as-topology-ext@ietf.org Subject: [Idr] ´ð¸´: ´ð¸´: WG Adoption call for draft-wang-idr-bgpls-inter-as-topology-ext-02.txt (10/4/2018 to 10/18/2018) Hi, Jie: Thanks for your supports and comments. Let¡¯s explain to you for our considerations for your concern points. 1) For Non-TE scenario, the redistributed link information will be carried in ¡°prefix descriptor¡±, as described in https://tools.ietf.org/html/draft-wang-idr-bgpls-inter-as-topology-ext-02#se ction-3.1, then no link related TLV will be carried. 2) For TE scenario, the inter-as link TLV should be treated different from the ordinary link TLV, as stated in https://tools.ietf.org/html/rfc5392#section-3.2.1 ¡°Given that OSPF is an IGP and should only be utilized between routers in the same routing domain, the OSPF specific Link ID and Neighbor ID sub-TLVs are not applicable to inter-AS links. ¡°, this is the same reason that we define the new TLV within BGP-LS. The format of these TLVs can be aligned, but the type ID should be different. For BGP-LS protocol, they should be newly assigned. Best Regards. Aijun Wang Network R&D and Operation Support Department China Telecom Corporation Limited Beijing Research Institute,Beijing, China. ·¢¼þÈË: Dongjie (Jimmy) [mailto:jie.dong@huawei.com] ·¢ËÍʱ¼ä: 2018Äê10ÔÂ8ÈÕ 22:34 ÊÕ¼þÈË: Susan Hares; idr@ietf.org ³ËÍ: draft-wang-idr-bgpls-inter-as-topology-ext@ietf.org Ö÷Ìâ: [Idr] ´ð¸´: WG Adoption call for draft-wang-idr-bgpls-inter-as-topology-ext-02.txt (10/4/2018 to 10/18/2018) Hi, This document describes valid use cases of building inter-domain topology using BGP-LS. Thus I support the adoption. And a few comment about section 4: The Link NLRI of BGP-LS includes the local node descriptors and remote node descriptors, in which the AS number TLV can be carried. Can this be used to specify the remote AS information? If so, the new remote AS number TLV may not be necessary. Please clarify whether the remote ASBR-ID is similar to one of the following TLVs: a. BGP router-ID as defined in draft-ietf-idr-bgpls-segment-routing-epe, b. IGP router-ID as defined in node descriptor sub-TLVs in RFC 7752, c. IPv4/IPv6 Router-ID as defined in Link attribute TLVs of RFC 7752. It would be good if some existing TLVs can be reused to fulfill the use cases described. Best regards, Jie ·¢¼þÈË: Idr [mailto:idr-bounces@ietf.org] ´ú±í Susan Hares ·¢ËÍʱ¼ä: 2018Äê10ÔÂ5ÈÕ 4:13 ÊÕ¼þÈË: idr@ietf.org ³ËÍ: draft-wang-idr-bgpls-inter-as-topology-ext@ietf.org Ö÷Ìâ: [Idr] WG Adoption call for draft-wang-idr-bgpls-inter-as-topology-ext-02.txt (10/4/2018 to 10/18/2018) Greetings: This is a WG adoption call for draft-want-idr-bgpls-inter-as-topology-ext-02.txt (10/4/2018 to 10/18/2018).. A quick link to the draft is at: https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-ext/ Please comment on whether you feel this addition to the BGP-LS set of drafts will help operational management of networks. Susan Hares IDR co-chair
- [Idr] WG Adoption call for draft-wang-idr-bgpls-i… Susan Hares
- Re: [Idr] WG Adoption call fordraft-wang-idr-bgpl… zhang.zheng
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Zhuangshunwan
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Lizhenbin
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Huzhibo
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Shaowen Ma
- [Idr] 答复: WG Adoption call for draft-wang-idr-bgp… Dongjie (Jimmy)
- [Idr] 答复: 答复: WG Adoption call for draft-wang-idr… Aijun Wang
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… li zhenqiang
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… 徐小虎(义先)
- Re: [Idr] 答复: 答复: WG Adoption call for draft-wang… Ketan Talaulikar (ketant)
- [Idr] 答复: 答复: 答复: WG Adoption call for draft-wang… Aijun Wang
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Huaimo Chen
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Xufeng Liu
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… LEI LIU
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Mach Chen
- [Idr] 答复: WG Adoption call for draft-wang-idr-bgp… Aijun Wang
- Re: [Idr] WG Adoption call for draft-wang-idr-bgp… Linda Dunbar