[AusNOG] Question on Carrier network design / MPLS

[Russell Langton]

Hi Steven,

In regards to the AAPT Geraldton example, while it may be a NBN POI and a
AAPT POP - they may have their BNG installed at only a central point in
Perth as it's more cost effective to install the BNG at a central location
rather then have 121 BNGs - one for each NBN POI.

I've sent you an email directly so we can discuss the Telstra enquirers.


On Fri, Jul 3, 2015 at 4:41 PM, Steven Crockett <steven at crox.com.au> wrote:

>  At a wholesale level most tier 2 (and some Tier 1) providers get their
> interconnections and “aggregate” in capital cities… any MPLS enablement and
> switching/routing is done in the core of the network with L2/VLAN delivery
> of individual circuits.
>
> As an example, even though AAPT have their own POP in Geraldton WA (400+
> north of Perth) with their own NBN interconnect AND their own DSLAM, an
> eLAN/MPLS network between two sites in Geraldton (one on NBN, one on DSL)
> will go via Perth (logically it may “appear” point to point to the
> customer, but the latency makes it clear it is not – and they have
> confirmed that this is in fact the case).
>
> As a Tier 2 – we get little choice on Telstra DSL to use a CBD based LNS,
> and aggregation circuits due to price and accessibility.
>
>
>
> My question is when it comes to Telstra (Retail) – are they any
> different?  I know they run their big CRS units like most carriers in
> capital cities (with an added POP in the Pilbara in WA)… but if two
> customer on fibre/DSL or DSL/DSL or SHDSL/fibre in the same city try to do
> a point to point connection over an MPLS network the traffic will still
> travel via the closest aggregation point / capital (Perth)?  Do they still
> route all DSL traffic via CBD based LNS, or can they deliver a local L2
> handoff to MPLS capable units to deliver local routing within an Exchange
> or zone?
>
>
>
> From a best practice network design it may pay to aggregate and push MPLS
> closer to the edge, but in practice I don’t think the carriers typically do
> much more than L2 aggregation over MPLS networks with the customer network
> added in the core??
>
>
>
> The customer sees point to point either way – but can Telstra actually
> deliver lower latency and local routing in these regional areas?
>
>
>
> Thanks!
>
>
>
> Steve Crockett
>
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