Re: [vnrg] Status of the VNRG: Dormant or dead?
Joe Touch <touch@isi.edu> Wed, 06 July 2011 15:52 UTC
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Date: Wed, 06 Jul 2011 08:51:44 -0700
From: Joe Touch <touch@isi.edu>
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To: Roland Bless <roland.bless@kit.edu>
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Subject: Re: [vnrg] Status of the VNRG: Dormant or dead?
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Hi, all, (speaking as an individual participant) On 7/6/2011 2:44 AM, Roland Bless wrote: ... >> We had the last meeting at the Beijing IETF meeting and also some lively discussion afterwards. >> >> One of the areas of discussion was (amongst many others): >> - openflow vs. forces >> - how forces would fit in virtual networks > > I see both technologies mainly focused on control plane / data plane > separation. I agree, and don't see either as particularly relevant to VNs. They're implementation issues, AFAICT. The more relevant technology to me is router virtualization. >> - do we need tunnel headers for virtual networks on the wire or not? > > That depends on the substrate technology, some allow to embed a "VNet > Tag" to identify different virtual links, e.g., VLAN-Tags in Ethernet > headers. Again, this is an implementation issue. I would expect some sort of indicator of VN, which can be buried inside an existing header or can require an additional header. >> - definition of acid tests > > Not only definition of acid tests, but also definition of > terms. For instance, how differ traditional VPNs from Virtual > Networks in the context of network virtualization? IMHO current > VPN solutions concentrate mainly on virtual links, advanced concepts > consider virtual nodes as active elements. IMO, a VPN extends an existing network to add a new node, or ties two existing networks together, i.e., it's a way to add a single private link to a new node. Further, VPN nodes are always a member of exactly one VPN. A PPVPN is a network provided by another party (the provider) so that users can join it via basically conventional VPN methods. I don't think of VPNs as addressing either link or router multi-use, either. None of this is true of VNs, IMO - a VN is a complete E2E network, can coexist with many other VNs (even to the same endpoint nodes), etc. > How do OpenFlow concepts fit > into the classification? IMO, Openflow is a tool; it does not define a network architecture. It can be useful in moving some network issues elsewhere (e.g., allowing a non-VPN capable node to join a VPN, or helping to implement router virtualization outside a router that doesn't support it). I don't see Openflow as anything other than one of many tools here - and one I've never needed to develop VNs (if others do, I'd be glad to hear why). >> What do you see is important for the RG right now or what is missing? > > See above, but maybe we should also consider questions such as > what interfaces and protocols are needed for creating inter-provider > virtual networks. That seems to presume we know what an intra-provider VN is, and I'm not sure we're all on a single page there... ;-) Joe
- [vnrg] Status of the VNRG: Dormant or dead? Martin Stiemerling
- Re: [vnrg] Status of the VNRG: Dormant or dead? Roland Bless
- Re: [vnrg] Status of the VNRG: Dormant or dead? Martin Stiemerling
- Re: [vnrg] Status of the VNRG: Dormant or dead? Roland Bless
- Re: [vnrg] Status of the VNRG: Dormant or dead? Joe Touch
- Re: [vnrg] Status of the VNRG: Dormant or dead? Lou Berger
- Re: [vnrg] Status of the VNRG: Dormant or dead? Joe Touch
- Re: [vnrg] Status of the VNRG: Dormant or dead? Márcio Melo
- Re: [vnrg] Status of the VNRG: Dormant or dead? Lou Berger
- Re: [vnrg] Status of the VNRG: Dormant or dead? Roland Bless
- Re: [vnrg] Status of the VNRG: Dormant or dead? Joe Touch