Re: Muni fiber: L1 or L2?

[Scott Helms <khelms () zcorum com>]

Jean,

Correct, there are few things that cost nothing, but the point is here that
PPPoE has been successful for open access to a far greater degree than any
other technology I'm aware of (anyone else have ideas?) in North America
and Europe.  I'd also say that the ERX is an EOL box, but that doesn't
invalidate your point, that's not a good platform for the LNS side.


On Wed, Feb 6, 2013 at 5:04 PM, Jean-Francois Mezei <
jfmezei_nanog () vaxination ca> wrote:

> On 13-02-06 16:53, Scott Helms wrote:
>
> > You realize that most commonly the L2TP LAC and LNS are just routers
> right?
> >  You're not getting rid of boxes, you're just getting rid of the only
> open
> > access technology that's had significant success in the US or Europe.
>
> Actually, there is a cost. In lower end Juniper routers, when you
> combine both L2TP and PPPoE, the total performance of the LNS router
> drops significantly because the interface cards can't do both at same
> time so the traffic must travel the backpane to the CPU/auxiliary
> processor for the second step.
>
> (at the LAC level, there is less overhead because PPPoE packets are just
> passed to the L2TP side, but at LNS, PPPoE packets have to be processed).
>
>
> Apparently, Juniper has worked to reduce this performance penalty in
> newer routers. But routers such as the ERX310 suffered from this quite a
> bit. (throughput of about 1.5mbps from what I have been told).


-- 
Scott Helms
Vice President of Technology
ZCorum
(678) 507-5000
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