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Re: Substrate Resouces
by John Jacob-2
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Stu,
You made some good points and raised good questions. I would like to
know how others on this list feel about this. As a point of
clarification, the selection of physical/logical/synthetic in the
current version was primarily to stimulate discussion. It is quite
likely that several of these assignments are confusing or incorrect. I
will incorporate your input into the master version to be redistributed
after the initial wave of discussions.
Thanks,
John
stuart.d.elby@... wrote:
> John,
>
> I have the same question; I am not sure what the boundary is between
> physical and logical as a result of sliceability. Building on
> Masanori's example, ff a network element has a CPU running routing
> protocol stacks and those processing threads can be partitioned into
> virtual router threads, then I have the basis for virtual routing
> functions (VRFs) which are logical routers built by 'slicing' a physical
> CPU. Is this what you were thinking when you labeled the columns?
>
> Another observation is that you have labeled 'Ports' as logical
> constructs. I do agree that this is a very important type of port we
> need to consider, but let's not loose sight of the physical (e.g. 100G)
> ports that will be used to connect these platforms to the underlying
> fiber facilities. I suggest that we consider "line cards" and "switch
> ports" physical entities, and "logical (switch) ports" logical entities
> to avoid confusion. The physical binding of a switch port "a" to a fiber
> facility to a switch port "b" would be a "physical circuit" or
> "connection". All other bindings of logical ports would be "synthetic"
> paths as you have already defined.
>
> -Stu
>
> -----Original Message-----
> From: substrate-wg-bounces@...
> [mailto:substrate-wg-bounces@...] On Behalf Of Masanori Takashima
> Sent: Friday, November 02, 2007 12:57 AM
> To: John Jacob
> Cc: substrate-wg@...
> Subject: Re: [substrate-wg] Substrate Resouces
>
> Hi, John,
>
> Let me know what do you mean by Sliceable at column F.
>
> I guess that Sliceable means that whatever an entry in column B consists
> of a set of finer grained resources. For example, CPU is Sliceable
> because CPU consists of a set of CPU usage, where CPU usage is a
> resource.
>
> Best regards,
> Masanori
>
>
>
> _______________________________________________
> substrate-wg mailing list
> substrate-wg@...
> http://lists.geni.net/mailman/listinfo/substrate-wg
>
>
_______________________________________________
substrate-wg mailing list
substrate-wg@...
http://lists.geni.net/mailman/listinfo/substrate-wg
You made some good points and raised good questions. I would like to
know how others on this list feel about this. As a point of
clarification, the selection of physical/logical/synthetic in the
current version was primarily to stimulate discussion. It is quite
likely that several of these assignments are confusing or incorrect. I
will incorporate your input into the master version to be redistributed
after the initial wave of discussions.
Thanks,
John
stuart.d.elby@... wrote:
> John,
>
> I have the same question; I am not sure what the boundary is between
> physical and logical as a result of sliceability. Building on
> Masanori's example, ff a network element has a CPU running routing
> protocol stacks and those processing threads can be partitioned into
> virtual router threads, then I have the basis for virtual routing
> functions (VRFs) which are logical routers built by 'slicing' a physical
> CPU. Is this what you were thinking when you labeled the columns?
>
> Another observation is that you have labeled 'Ports' as logical
> constructs. I do agree that this is a very important type of port we
> need to consider, but let's not loose sight of the physical (e.g. 100G)
> ports that will be used to connect these platforms to the underlying
> fiber facilities. I suggest that we consider "line cards" and "switch
> ports" physical entities, and "logical (switch) ports" logical entities
> to avoid confusion. The physical binding of a switch port "a" to a fiber
> facility to a switch port "b" would be a "physical circuit" or
> "connection". All other bindings of logical ports would be "synthetic"
> paths as you have already defined.
>
> -Stu
>
> -----Original Message-----
> From: substrate-wg-bounces@...
> [mailto:substrate-wg-bounces@...] On Behalf Of Masanori Takashima
> Sent: Friday, November 02, 2007 12:57 AM
> To: John Jacob
> Cc: substrate-wg@...
> Subject: Re: [substrate-wg] Substrate Resouces
>
> Hi, John,
>
> Let me know what do you mean by Sliceable at column F.
>
> I guess that Sliceable means that whatever an entry in column B consists
> of a set of finer grained resources. For example, CPU is Sliceable
> because CPU consists of a set of CPU usage, where CPU usage is a
> resource.
>
> Best regards,
> Masanori
>
>
>
> _______________________________________________
> substrate-wg mailing list
> substrate-wg@...
> http://lists.geni.net/mailman/listinfo/substrate-wg
>
>
_______________________________________________
substrate-wg mailing list
substrate-wg@...
http://lists.geni.net/mailman/listinfo/substrate-wg
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