[c-nsp] SPA Module compatibility

Gert Doering gert at greenie.muc.de
Mon Feb 24 17:14:16 EST 2014


On Mon, Feb 24, 2014 at 09:52:16PM +0100, Christian Kratzer wrote:
> Reading between the lines of Gerts mail I saw the words "line rate" ...
> I understand the carriers desire to offer various bandwidth options between 
> 100mbit/s abd 1git/s.
> I just don't fully trust their shaping/policing solutions to provide the 
> inbetween bandwidths.

Indeed.  I deeply distrust "2Mbit/s on ethernet" thingies and such, though 
that stuff seems to work surprisingly well today - *better* than some of
the "2Mbit via ATM VC, with a carrier not being able to tell us which
shaping values to use, thus losing OAM cells on saturated links"...

(The same goes for 200Mbit on GE links, of course - anything where the
router doesn't know the actual end-to-end speed and would need to either
rely on "the modem" behaving "properly" in regards to queueing/buffering/
policing, or apply hierarchical shaping on the router, which will usually
be not available in the platform you have)

USENET is *not* the non-clickable part of WWW!
Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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