Hi, I had a brief look at the document. I had a few comments on the same: 1. Introduction - We have talked about advantages of virtualization. One of the big benefits of virtualization are the economy of scale. As the CPU/ Memory is costs are decreasing, so using a system with higher CPU and Memory is better then using 10 systems with 1/10 the memory. 1.1 Another advantage WRT physical infrastructure, I can see is that we can partition resources into chunks that was not possible earlier. So we can have links which are like 1.7 Mbps, which allows a higher level of compartmentalization. 2. Introduction - From the way you are talking about network virtualization, there is an overhead of resources required for the physical topology connectivity, over which the virtual topology resides. 2.2 A disadvantage I can see is that physical topology change will cause effect to the virtual links, though the effects may not be visible to the virtual topology itself. 3. A lot of routers have virtual router functionality, which allows for sharing of resources, between various different instances, in a non-interfering fashion, over the same OS instance though. We cannot impose any virtual topology on the physical topology, but can be a subset of the same. Another example of the same is Multitopology extensions. You can talk about these things in the Motivation section you mention. 4. I think one important aspect of isolation is to allow for paritioning of resources so that one misbehaving resource does not affect the other. 5. From the management perspective, we need different layers of management. One which partitions the physical resource to a virtual resource, then each virtual resource needs an isolated manager. 6. I think one of the important security issue is physical security will no longer work. By adding a new layer virtualization increases overload, as well as a new vector for security. Typo: 1. Abstract - This document presents the definition and effectiveness of virtual networks and discusses the key components and challenges of supporting virtual networks on "physical network infrastructure". Added the words in "...". 2. s/ The virtual networks over physical infrastructure are completely isolated each other, / The virtual networks over physical infrastructure are completely isolated from each other, / 3. s/ Virtualization resource is typically realized by adopting virtualization layer in the physical resources,/ Virtualization of a resource is typically realized by adopting virtualization layer in the physical resources,/ 4. s/efficient control of the virtual resources../ efficient control of the virtual resources./ Thanks, Vishwas ============================================= Dear VNRG folks, As a follow-up of last Beijing meeting, we have developed a document that investigates the definition, key components and challenges, and acid tests for virtual networks. Please find the document from link below. Any comments are appreciated. Regards, Sangjin ---------- Forwarded message ---------- From: <Internet-Drafts at ietf.org> Date: Fri, Dec 24, 2010 at 5:00 PM Subject: I-D Action:draft-jeong-vnrg-virtual-networks-ps-00.txt To: i-d-announce at ietf.org A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : Virtual Networks Problem Statement Author(s) : S. Jeong, D. Colle Filename : draft-jeong-vnrg-virtual-networks-ps-00.txt Pages : 9 Date : 2010-12-23 This document presents the definition and effectiveness of virtual networks and discusses the key components and challenges of supporting virtual networks in the networks. ?It also describes acid tests for virtual networks. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-jeong-vnrg-virtual-networks-ps-00.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft. _______________________________________________ I-D-Announce mailing list I-D-Announce at 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
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