[AusNOG] NBN Co Layer 2 vs. Layer 3 Services

[Daniel Hooper]

"but will be forced to travel all the way out to an interconnect point and through RSP1, then be handed over to RSP2"

That's just the nature of the beast, if factory #1 was really serious about exchanging large volumes of traffic to the premises next door wouldn't they be eligible to purchase a layer2 style of service from an RSP? I haven't seen any thing so far that mandates that providers must only sell layer3 services. Surely the RSP could apply for a VLAN to be mapped between port X on customers ONT and mapped to another port on another ONT?

From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Paul Brooks
Sent: Thursday, 22 April 2010 2:10 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] NBN Co Layer 2 vs. Layer 3 Services

I've had several people bend my ear as to why they think NBNCo should be layer 3/IP, coming mainly from ATUG and end-user land.
Most of it was from several months ago before CA and NBNCo put out the consultation papers outlining why we thought Layer 2 was the way to go.

I haven't heard any particularly persuasive arguments, or a clear articulation of the problem that would be solved by NBNCo being 'Layer 3', and I would have hoped that the consultation papers would explain why NBNCo doing Layer 2 didn't mean the Layer 3 services from RSPs would be limited.

For fairness, one of the arguments was around traffic efficiency - that in a Layer-2 model, traffic from (say) a factory connected to one RSP that wanted to get to (say) a business partner located physically right next door that was connected to a different RSP would not follow an optimal path across the street, but will be forced to travel all the way out to an interconnect point and through RSP1, then be handed over to RSP2, then have to travel all the way back to the recipient - possibly hundreds of kilometres.  The guys advocating for Layer3 seem to assume that NBNCo's routers would allow the traffic to cut-through and stay entirely local, and would not have to hit either of the RSPs core networks at all. I remain unconvinced.

I note Phil Dobbie has just released a Twisted Wire episode looking at Layer 3, that I haven't listened to yet - Skeeve, is the Twisted Wire podcast that led to your question?

P.


On 22/04/2010 9:22 AM, McDonald Richards wrote:
I've been to a couple of their workshops now and from what I can tell, NBN Co have no intention of providing a layer 3 service. Where are the other voices and are they people with clue or just opinion pieces from industry commentators?

Macca


From: ausnog-bounces at lists.ausnog.net<mailto:ausnog-bounces at lists.ausnog.net> [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Skeeve Stevens
Sent: Thursday, 22 April 2010 9:03 AM
To: ausnog at ausnog.net<mailto:ausnog at ausnog.net>
Subject: [AusNOG] NBN Co Layer 2 vs. Layer 3 Services

Hey all,

Just a quick question.

At the moment there is a lot of talk of NBN and whether they are going to deliver Layer 2 or Layer 3 services.

I am a little confused about what is meant by that.  In that as ISP's, I would assume that we would only want Layer 2 services from them? Just in kind of a DSL Wholesale/Ethernet wholesale/etc situation that we already have.

Most of our ISP customers would be happy if the NBN operated just like the current wholesale models out there at the moment.  Little ISP calls his aggregator and says he wants a NBN VLAN to this address which they get from NBNCo (if directly if you are big enough and can afford to interconnect yourself), which is turned on and presented at an aggregation port... very much like taking wholesale ethernet from Pipe, Nextgen, Telstra and others today.

This makes sense to me.

But there is a bunch of voices saying they want the NBN Co to do Layer 3... and I am not quite sure what is meant by that?  Users buy bandwidth off the NBN Co? Turning them into a retail ISP?

If this seems like a stupid question, I am sorry about that... but there are some voices who have access to presenting their views and are doing so about NBN should be doing Layer 3... and I am trying to find some understanding about what is actually being suggested.

...Skeeve

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