[asterisk-users] Teliax Quality of Service

[Douglas Garstang]

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of SIP
> Sent: Monday, August 06, 2007 8:56 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Teliax Quality of Service
> 
> Steve Totaro wrote:
> > Anthony Francis wrote:
> >
> >> Tim Panton wrote:
> >>
> >>
> >>> On 5 Aug 2007, at 06:54, Douglas Garstang wrote:
> >>>
> >>>
> >>>
> >>>
> >>>> I don't think creating a network without a single point of
failure
> >>>> is unreasonable.
> >>>>
> >>>>
> >>>>
> >>> It's impossible. I can't think of a single example where this
> >>> actually exists.
> >>>
> >>> Getting even close is hideously expensive.
> >>>
> >>> Tim, speaking for himself :-)
> >>>
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> >>>
> >>>
> >> In fact, the only people who would say something like this are
folks
> who
> >> have never PHYSICALLY implemented a network, they simply don't
> >> understand the limitations involved.

I worked for a CLEC in Montana, not Silicon Valley, not Manhatten, but
rather PODUNK, Montana. We had redundant multi-homed servers, connected
to multiple switches, running OSPF. A failure in any component (server,
network, cable) would cause a failover to a backup component in about 6
seconds. We had multiple upstream providers. The servers where divided
between multiple racks, split between different power plants. We did
just about everything we could to make the setup redundant.

The CPE equipment at any single location might fail, and that wasn't
redundant, but at least if that failed, it would not affect any other
customers. CPE equipment included POE enabled phones, a UPS, a POE
switch and power being delivered from our plant.

Yes, all the equipment was located at the same physical location. In
hindsight, we could have multi-homed our collocations. Why can't service
providers multi home their edge systems to accept incoming calls from
two physical locations? If a service provider did this, they would have
two completely independent facilities, potentially thousands of miles
apart, connected to different upstream providers. I can't think of
anything short of nuclear war that would destroy their ability to accept
calls. If they did least cost routing, it wouldn't even matter if their
providers failed. China gets hit by a meteor and NO provider can deliver
calls to China? Fine... at least you can still call everywhere else.

Maybe it still had some holes, but jeez, at least we tried to deliver
high quality service.