[AusNOG] [ISOC-AU-mems] Quigley announces architectural "stake in the ground"

Paul Brooks pbrooks-ausnog at layer10.com.au
Wed Sep 16 23:24:26 EST 2009

Adrian Chadd wrote:
> On Wed, Sep 16, 2009, Mark Smith wrote:
>> The dumber the better ... ideally support for direct customer site to 
>> wholesale aggregation site larger than 1500 byte Ethernet frames.
>> (e.g. >1500 to allow for options of MPLS, L2TPv3, Q-in-Q, Mac-in-MAC, 
>> PBB, PBT etc. encapsulation, just in case)
> So what about direct customer<->customer communication? Does that have
> to pass through your aggregation layer(s) ?

If nothing else, the lawful intercept obligations would suggest yes. I 
can't see these requirements being relaxed in the NBN world.

This need not be a significant performance penalty - if the access 
network is some form of PON, this looks much like a DSLAM with virtual 
point-to-point links to each home in any case. The upstream packets from 
one home have to go up to the active OLT before they can be turned 
around and sent back to another home - the backplane of the OLT, or a 
big ethernet switch nearby can be treated as an aggregation point with 
negligable time penalty.

Paul Brooks               |         Mob +61 414 366 605
Layer 10 Advisory         |         Ph  +61 2 9402 7355
Layer 10 - telecommunications strategy & network design

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