Hi Cheng Zhou, Thanks for sharing. I see interesting aspects on the draft. Let me share my thoughts.
- part of the draft is about how ALTO can get topological information. Today we can retrieve such information through BGP and BGP-LS, and with that build both network and cost map. Your proposal of using NETCONF would be a complementary (or alternative) way of doing so, which is fine. What I'm wondering is the following. We can assume that in a network like that, i.e. leveraging or supporting NETCONF, we will have a controller. So, why do not assume that the ALTO collects the information from a controller rather than from the devices? Not sure if there could be an issue with many components retrieving info from the devices simultaneously, so the controller could unify that process. - In line with the previous comment, relaying on NETCONF could not be sufficient for having all the information. Could be the case that some vendors do not support the specific model, or even that part of the network does not support NETCONF at all. This issue is not present with BGP, and most probably not present with BGP-LS, so probably it could be needed to yet relay on BGP and BGP-LS for ensuring full collection of the info. Thus some kind of reconciliation between the different databases would be needed. Do you have any insight on this? - it is interesting the approach of retrieving topologies other than the physical one (I mean, VPN topology). This opens an interesting aspect to explore which I'm particularly interested in. For instance, putting together such overlay view with the performance metrics being proposed in ALTO could be certainly interesting. Other situations can be also of interest. I will think about that and come back with some ideas. Best regards Luis -----Mensaje original----- De: alto <alto-boun...@ietf.org> En nombre de Cheng Zhou Enviado el: miércoles, 21 de julio de 2021 5:51 Para: alto@ietf.org Asunto: Re: [alto] I-D Action: draft-hzx-alto-network-topo-00.txt Hi, All: As we know, the CDN makes use of an ALTO server to choose a better CDN surrogate. However CDN may not be able to passively listen to routing protocol, nor may have access to other network topology data (e.g., inventory databases). Based on our analysis, CDN is built on top of underlying network which runs these routing protocols and the network topology can be gathered via BGP-LS or NETCONF YANG. I2RS working group have published various network topology models such as L3 topology model, L2 topology model. We are wondering whether we can use NETCONF protocol to collect these network topology data and translate into ALTO map data. Here is the relevant draft we proposed in ALTO working group: https://datatracker.ietf.org/doc/html/draft-hzx-alto-network-topo-00.txt Please let us know if you have any comments or suggestions. Thanks and Regards, Cheng Zhou -----Original Mail----- 发件人: I-D-Announce [mailto:i-d-announce-boun...@ietf.org] 代表 internet-dra...@ietf.org 发送时间: 2021年6月25日 11:40 收件人: i-d-annou...@ietf.org 主题: I-D Action: draft-hzx-alto-network-topo-00.txt A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : Network Topology data retrieval using ALTO protocol Authors : Hanshu Hong Cheng Zhou Chongfeng Xie Qiufang Ma Filename : draft-hzx-alto-network-topo-00.txt Pages : 12 Date : 2021-06-24 Abstract: RFC8345 introduces an abstract YANG data model to represent network topologies. This document uses ALTO protocol to provide access to network Topology data such as L3 topology data , data center network topology data, flexible enough to enable querying of specific and possibly aggregated data. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-hzx-alto-network-topo/ There is also an htmlized version available at: https://datatracker.ietf.org/doc/html/draft-hzx-alto-network-topo-00 Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ I-D-Announce mailing list i-d-annou...@ietf.org https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft directories: http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt _______________________________________________ alto mailing list alto@ietf.org https://www.ietf.org/mailman/listinfo/alto ________________________________ Este mensaje y sus adjuntos se dirigen exclusivamente a su destinatario, puede contener información privilegiada o confidencial y es para uso exclusivo de la persona o entidad de destino. 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