If it is not installed, expect to see your mesh to be unreliable and to periodically stop altogether.
There are many mesh parameters that are required that cannot be set until the interface is established. One of the functions of mesh11sd is to dynamically set these parameters as required.
In prior releases of OpenWrt, a consequence of bugs elsewhere meant that you could often get away without setting these mesh parameters if the mesh consisted of only 2 nodes. On some brief testing here, I found this lucky combination of bugs allowing a 2 node mesh to establish, seems no longer to work...
I am not saying there is no underlying problem with your actual hardware/firmware/setup but installing mesh11sd would be a good starting point for trying to fix your issue.
You just need to install it, everything should then be autonomous...
Once installed, the device may restart the wireless several times and you will most likely appear to loose contact with the remote node - but after a couple of minutes you should be able to run mesh11sd status
on your portal node (the one connected to your Internet feed).
It should give you a json formatted output of the status of the mesh.
Here is an example:
root@mt1333-1:/tmp# mesh11sd status
{
"setup":{
"version":"3.0.0beta",
"enabled":"1",
"procd_status":"running",
"portal_detect":"1",
"mesh_basename":"m-11s-",
"checkinterval":"10",
"interface_timeout":"10",
"debuglevel":"1"
}
"interfaces":{
"m-11s-1":{
"mesh_retry_timeout":"100",
"mesh_confirm_timeout":"100",
"mesh_holding_timeout":"100",
"mesh_max_peer_links":"8",
"mesh_max_retries":"3",
"mesh_ttl":"31",
"mesh_element_ttl":"31",
"mesh_auto_open_plinks":"0",
"mesh_hwmp_max_preq_retries":"4",
"mesh_path_refresh_time":"1000",
"mesh_min_discovery_timeout":"100",
"mesh_hwmp_active_path_timeout":"5000",
"mesh_hwmp_preq_min_interval":"10",
"mesh_hwmp_net_diameter_traversal_time":"50",
"mesh_hwmp_rootmode":"3",
"mesh_hwmp_rann_interval":"5000",
"mesh_gate_announcements":"1",
"mesh_fwding":"1",
"mesh_sync_offset_max_neighor":"50",
"mesh_rssi_threshold":"-70",
"mesh_hwmp_active_path_to_root_timeout":"6000",
"mesh_hwmp_root_interval":"5000",
"mesh_hwmp_confirmation_interval":"2000",
"mesh_power_mode":"active",
"mesh_awake_window":"10",
"mesh_plink_timeout":"0",
"mesh_connected_to_gate":"1",
"mesh_nolearn":"0",
"mesh_connected_to_as":"1",
"mesh_id":"--__",
"device":"radio0",
"channel":"1",
"tx_packets":"169806",
"tx_bytes":"12068837",
"rx_packets":"124729",
"rx_bytes":"6596016",
"active_peers":"1",
"peers":{
"94:83:c4:08:14:83":{
"next_hop":"94:83:c4:08:14:83"
}
}
"active_stations":"0",
"stations":{
}
}
}
}