RE: [PCN] Architecture draft

Joe - trying to clarify... what's the PCN-domain? Does it run from one
*enterprise* LAN edge switch/router to another (there's a tunnelled link
between them), or from the end terminals. Ie what are the
pcn-boundary-nodes {&pcn-interior-nodes)?

The scenario isnt captured I think in the draft-ietf-pcn-architecture,
so something should probably be added...

Thanks
Phil. 

> -----Original Message-----
> From: Jozef Babiarz [mailto:babiarz@nortel.com]
> Sent: 29 October 2007 21:06
> To: Lars Eggert
> Cc: pcn@ietf.org; Geib, Ruediger
> Subject: RE: [PCN] Architecture draft - probing section & general
updates.
> 
> Hi Lars,
> I did not explain my scenario that clearly, I confused people the word
> "access node". So here goes a second try.
> 
> I'm thinking of a scenario that many enterprises face today. Large
multi
> location enterprises use multiple WAN links or VPS to interconnect
their
> locations (branch offices). PCN is run inside the enterprise network
> including WAN links which may be tunneled across the carrier network.
> Carrier network is not required to support PCN as the enterprise
traffic
> including PCN marking is tunneled, however it could.  Network Access
> Control with PCN admission control is done at the *enterprise* LAN
edge
> switch/router. New flows can be routed to any egress LAN edge
> switch/router and some flows will (between different locations) be
> routed over one of the WAN links which are normally bandwidth
> constrained. There is a high probability that many of the edge LAN
> switches/routers will have no flows setup between each other (no
> ingress-egress aggregate) as there are a large number of edge LAN
> switches/routers in the enterprise network and people calling patterns
> change. They normal expect that they should be able to call anyone.
> 
> 
> Regards, Joe
> email:babiarz@nortel.com
> Telephone:613-763-6098
> 
> -----Original Message-----
> From: Lars Eggert [mailto:lars.eggert@nokia.com]
> Sent: October 25, 2007 5:54 AM
> To: Babiarz, Jozef (CAR:0S03)
> Cc: Geib, Ruediger; pcn@ietf.org
> Subject: Re: [PCN] Architecture draft - probing section & general
> updates.
> 
> On 2007-10-24, at 19:14, ext Jozef Babiarz wrote:
> > I'm thinking of a scenario that many enterprises face today. Large
> > multi
> > location enterprises use multiple WAN links or VPS to interconnect
> > their
> > locations. PCN is run inside the enterprise network including WAN
> > links
> > which maybe tunneled across the carrier network. Network Access
> > Control
> > with PCN admission control is done at the enterprise access edge
> > nodes.
> > New flows can be routed to any egress access edge node and some
flows
> > will (between different locations) be routed over one of the WAN
links
> > which are normally bandwidth constrained.
> 
> I understand your scenario so far.
> 
> > There is a high probability
> > that many access nodes will only have one flow between each other as
> > there are a large number of them.
> 
> I don't see how this follows, however. It seems that if the sites
> that are being interconnected aren't tiny, there should very likely
> be multiple flows per ingress/egress pair, no?
> 
> Lars
> 
> 
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RE: [PCN] Architecture draft - probing section & general updates.