Re: [v4tov6transition] a few quick reviews of the documents for today
Jason Lin <jasonlin.gz@gmail.com> Sat, 25 September 2010 09:11 UTC
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Date: Sat, 25 Sep 2010 17:10:45 +0800
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From: Jason Lin <jasonlin.gz@gmail.com>
To: jari.arkko@piuha.net, v4tov6transition@ietf.org
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Subject: Re: [v4tov6transition] a few quick reviews of the documents for today
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>>5. IPv6 Transition Guide For A Large ISP Providing Broadband Access draft-yang-v4v6tran-ipv6-transition-guide >> >>This is a very interesting document, I like reading about specific networks and natives and pros/cons >>in your specific case. A couple of questions/comments: >> >>Section 1: What's "the existing single transition technology" referred from the text? ====================================== Thank you, it should be explained more in details. I think its idea is that "a suitable completely solution" is needed besides the specific technology like 6rd, DS-Lite, ect. There are many options for different specific scenarios, but due to the features of each technology, some technologies may not compatible with others, some may be not needed when some one is deployed, and some will interoperating with others in good performance. So, it is possible that some combinations of a group of solutions or technologies could be the "completely solutions". For example, when we are building a completed new dual-stack metro network and access network, 6rd may not be considered as the the subscribers' access method. Another example is while we upgrade the BRAS to IPv6-only, and the CR to Dual-stack, what relative technologies should be deployed as the best practice? It may be a combination of [ds-lite_cpe]+[v6_bras]+[ds_metro_cr]+[ds-lite]+[ds_backbone]. And the pros and cons over here should be considering together. ========================================= >>I like the contrasting of various deployment options in Section 2.1. (Does Section 2.1.1 assume >>that dual stack == simultaneous roll-out of IPv6 in all routers in the network? Many networks >>employ a gradual approach to deployment, converting a small number of routers at a time and/or >>acquiring new devices for pure IPv6-only service on a case-by-case basis. The pros/cons may be >>different if you do this instead of a one-time rollout.) ============================================ Yes, I agree that it is possible to conduct a incremental deployment on the existing IP backbone in some cases. And the pros and cons may be different. For the solution of 6PE over MPLS backbone, it is more reasonable to conduct a incremental deployment rather than a simultaneously deployment. For incremental deployment: Pros: o Helpful for the smooth transition, less influence to existing services on other POPs which do not upgrade. o The v6 traffic will not increase rapidly in a short term, which could be good for performance and stability of the IP backbone. For the upgrading of existing IP backbone, the most possible fact is it will be done before the metro network, access network and providing IPv6 services. The optimal situation is v6 traffic will increase gradually along with the metro networks providing v6 services one by one. However, the reason for a Large scale broadband network transitioning to v6 is mainly the fast increasing rate of the subscribers who are accessing to different metro network. Therefore, it is possible that the ipv6/dual-stack services are highly demanded for many metro networks nearly at the same time when the IPv4 addresses are exhausted. So, the related POPs of backbone are required to support dual-stack focus on a small period of time. =============================================== Best Regards, Jason Lin jasonlin.gz (at) gmail.com China Telecom