On Wednesday, January 07, 2015 12:28:20 PM Pau wrote:
> Can you please make two cents about what do you mean for ground routing?


Ground routing is a way of building supernodes developed by ninux community 
network, in practice because they was experiencing bugs in openwrt drivers and 
their links were mostly AP-STA they started to separate routing from the radio 
layer, so on the roof you have CPE that only do radio stuff either with openwrt 
or fabric firmware, while the router is inside your house, there are two 
variants, one in which an ethernet cable run from each CPE to the router and 
one in witch you have a gigabit siwtch on the roof where all CPE are connected 
and only one gigait ethernet cable run to your ground router, lime actually 
supports both modes, first mode have the advantage that doesn't needs 802.1q 
tagged vlan support (on both GR and CPE) while have the disadvantage that you 
have to run one cable for each CPE, the second mode have the advantage that 
you can run just one gigabit ethernet cable from your roof switch to your GR 
but needs that both GR and CPEs have 802.1q tagged vlan support to avoid L2 
loop, i believe it have some similaruty with guifi hibrid mode, but using open 
source router, having now libre-mesh supporting GR it means that supernode 
configuracion is quite simpler having most of them automatically generated by 
lime :)

A tipical topology with gigabit switch on the roof
=== ethernet link
------- wireless link

In the house 1                on the roof 1
<lime GR 1>======<GbEth switch>||=====<CPE1.1>------

on the roof 2                                                   In the house 2
--------<CPE2.1>====||<GbEth switch>====<lime GR2>

on the roof 3                                                   In the house 2
--------<CPE3.1>====||<GbEth switch>====<lime GR2>

The usage of tagged 802.1q vlans avoid L2 loop

Here you can find more informations about GR 
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