<div dir="ltr">I don't know if this is possible for higher density cities, but the fiber ISP here uses P2P fiber ring from the house all the way back to the CO. It's only at the CO that they aggregate to the GPON port. This means I do not share any field fiber with anyone else and the ring design allows for a single fiber cut to not take out my Internet.<div><br></div><div>It seems "
<span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">and allowing competition </span><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">for service from multiple isps" is the main point for your described setup. My current setup is fine for my single ISP, but they don't have to share with anyone else. I have heard of alternative setups where the CO was not owned by an ISP, but where all the ISPs hooked into the fiber network. North West East South redundancy sound overly redundant, but I guess I would not complain. I assume it means powered equipment in the field, unless there's a way to passively do that without dropping the signal strength. I would prefer a two point redundant system that was passive over an active 4 way redundant system that could have power failures, which are more common than fiber cuts around here. My firewall has nearly 450 days of uptime, not many power outages either.</span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">I am already one hop away from everyone in the city, including my employer. The ISP uses a flat network model, everything plugs into the core. The core router has many ports with a minimum rates of 100Gb. The GPON units plug directly into the core, and they're only used as layer 2 devices. The GPON units have 1 or more 100gb or 400gb uplinks. The network is provisioned to be fully non-blocking. It can handle all customers at 100% of their provisioned rates at the same time. Other than for redundancy, there's little reason to have routing/forwarding being done in the field. A "hub" pattern is fine and scales just fine, and less complex.</span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">I'm not sure one hop away if useful in a multi-ISP shared network since your packets need to go to your ISP in order to get routed back to your neighbor.</span></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jul 23, 2018 at 9:56 AM Dave Taht <<a href="mailto:dave.taht@gmail.com">dave.taht@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Great info, thx. Using this opportunity to rant about city-wid<br>
networks, I'd have done something so different<br>
than what the governments and ISPs have inflicted on us, substituting<br>
redundancy for reliability.<br>
<br>
I'd have used bog standard ethernet over fiber instead of gpon. The<br>
only advantages to gpon were that it was a standard normal folk<br>
(still) can't use, it offered encryption to the co-lo, and the gpon<br>
splitter at the neighborhood cabinett could be unpowered, and a<br>
telco-like design could be made telco-level reliable.Theoretically. In<br>
reality it constrains the market and raises the price of gpon capable<br>
gear enormously, thus creating a cost for the isp and a healthy profit<br>
margin for the fiber vendor.<br>
<br>
Neighborhood cabinets would be cross connected north, east, west,<br>
south, uplink1, uplink2, thus rendering the entire network immune to<br>
fiber cuts and other disruptions of service and allowing competition<br>
for service from multiple isps. Fiber or copper or wireless (cell) to<br>
the building from there. Your neighbor would be one hop away. Local<br>
cellular or wifi would spring out of smaller towers distributed above<br>
those cabinets.<br>
<br>
Lest you think I'm entirely insane, that's how amsterdam's network was<br>
built out 10+ years ago.<br>
<a href="https://arstechnica.com/tech-policy/2010/03/how-amsterdam-was-wired-for-open-access-fiber/" rel="noreferrer" target="_blank">https://arstechnica.com/tech-policy/2010/03/how-amsterdam-was-wired-for-open-access-fiber/</a><br>
<br>
I'd have avoided MPLS, and gone with something like 64xlat to deal<br>
with the ipv4 distribution problem. There'd be a secure routing<br>
protocol holding the city-wide network together. And there'd be<br>
ponies. Lots of ponies.<br>
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</blockquote></div>