Bhumip, et, al, This draft has covered issues associated with many aspects of data centers. Some of those aspects are out of scope of NVo3. For example: Requirement of Resource Allocation Gateway which deals with compute & storage resource management. It is definitely out of the scope of NVo3. I am not even sure if they are within the scope of IETF. "Firewall state maintenance" after VM migration should be out of the scope of NVo3 as well.
"Migration scheduling" should be out of scope of NVo3. The draft also describes switches within data center, I don't think it is necessary to have yet another draft describing data center typical architecture. Please refer to "http://datatracker.ietf.org/doc/draft-ietf-armd-problem-statement/"; which has a very comprehensive description of typical DC architecture (Section 6: Generalized Data Center Design). The draft has many sections in describing why there is VM migration in data centers and the limitation of 4K VLAN to "accommodate a large number of tenants", which have been very well documented in the "NVo3 problem statement ". I don't think it is necessary to have another draft repeating the same thing. There are also some description which are not quite correct: - 3.2.14: It is incorrect to list IEEE802.1Qbg and Vepa as solution to East - West traffic problem. - Section 3.1 (The Evolution Problems of the Logical Network Topology in VMMI environments): I don't think the following statement is valid: "Since a large number of VMs and their applications are running in the same Layer-2 domain, it (VM migration) may be very stressful from bandwidth utilization viewpont of the data center switching network." Applications communicate with each other via IP addresses. Yes, some instances are placed in the same subnet. VM migration is not the main reason for bandwidth utilization. There are many reasons for (poor) bandwidth utilization. "In order to improve the bandwidth utilization, it is required to upgrade the load balancing capability of the network which has numerous ECMP between different points." This "load balance" has nothing to do with VM mobility. I don't understand how "Matrix DCN" have anything to do with VM mobility either. - The whole section of Cloud Service Virtualization requirement is out of scope of NVo3. - 3.2.7 VN requirements: it doesn't have anything new which haven't been addressed by "nvo3 problem statement". - 3.2.8: packet encapsulation problems: The section describes several encapsulation mechanisms: PBB, NvGRE, VxLAN. There is nothing new here. I can understand if you write some real issues associated with each of those encapsulation. But simply listing them down for education purpose is not necessary. - 3.2.12: "traffic roundabout problem" has been very well described in "draft-rekhter-nvo3-vm-mobility-issues" under "optimal routing section". I don't think it is necessary to repeat. - I don't quite understand why you say "VxLAN"/NvGRE are encapsulation, NVo3 is tunneling (Section 3.2.13) Linda Dunbar From: [email protected] [mailto:[email protected]] On Behalf Of Richard Bin liu Sent: Thursday, October 18, 2012 12:44 PM To: [email protected] Subject: [nvo3] draft-khasnabish-vmmi-problems-02 Greeting all, We had published this draft and wanted to bring it to the NVO3 WG's attention. We plan to present/discuss this draft at the upcoming meeting as well, consequently please discuss here on the maillist as well. Thanks, Bhumip Khasnabish, et al. A new version of I-D, draft-khasnabish-vmmi-problems-02.txt has been successfully submitted by Bin Liu and posted to the IETF repository. Filename: draft-khasnabish-vmmi-problems Revision: 02 Title: Requirements for Mobility and Interconnection of Virtual Machine and Virtual Network Elements Creation date: 2012-10-15 WG ID: Individual Submission Number of pages: 46 URL: http://www.ietf.org/internet-drafts/draft-khasnabish-vmmi-problems-02.txt Status: http://datatracker.ietf.org/doc/draft-khasnabish-vmmi-problems Htmlized: http://tools.ietf.org/html/draft-khasnabish-vmmi-problems-02 Diff: http://www.ietf.org/rfcdiff?url2=draft-khasnabish-vmmi-problems-02 Abstract: In this draft, we discuss the challenges and requirements related to migration, mobility, and interconnection of Virtual Machines (VMs)and Virtual Network Elements (VNEs). VM migration scheme across IP subnets is needed to implement virtual computing resources sharing across multiple network administrative domains. For the seamless online migration in various scenarios, many problems are needed to be resolved on the control plane. The VM migration process should be adapted to these aspects. We also describe the limitations of various types of virtual local area networking (VLAN) and virtual private networking (VPN) techniques that are traditionally expected to support such migration, mobility, and interconnections.
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