| Description |
This article describes how the Mesh leaf FortiAP calculates the best Mesh root FortiAP. |
| Scope |
FortiAP-S and FortiAP-W2. Related Software Versions – FortiAP version 6.4 and later. |
| Solution |
In a scenario where there are multiple Mesh root and a Mesh leaf FortiAP configured.
The Mesh Leaf FortiAP calculates the best Mesh root FortiAP as below.
Leaf AP will always choose the lowest s_tot’s bssid as the associate target:
s_tot = s_hop + s_chan + s_rate + s_rssi +s_band
s_hop = value_a X MESH_SCORE_HOP_WEIGHT s_chan = value_b X MESH_SCORE_CHAN_WEIGHT s_rate = value_c X MESH_SCORE_RATE_WEIGHT s_rssi = value_d X MESH_SCORE_RSSI_WEIGHT s_band = value_e X MESH_SCORE_BAND_WEIGHT
The explanation for the above parameters is given below.
Default Mesh SCORE _ Weight config:
MESH_MAX_HOPS: =4 MESH_SCORE_HOP_WEIGHT: =50 MESH_SCORE_CHAN_WEIGHT: =1 MESH_SCORE_RATE_WEIGHT: =1 MESH_SCORE_BAND_WEIGHT: =100 MESH_SCORE_RSSI_WEIGHT: =100
s_hop calculation:
s_hop = value_a X MESH_SCORE_HOP_WEIGHT
value_a = This bssid broadcast ap’s mesh hop count, if the parent ap direct connect to FGT value_a should be equal to zero
s_chan calculation:
s_chan = value_b X MESH_SCORE_CHAN_WEIGHT
value_b = Command 'cw_diag –c mesh-ap' will print out a channel status table which will calculate and show each channel’s rssi_total. value_b equal to the bssid’s channel rssi_total.
s_rate calculation:
s_rate = value_c X MESH_SCORE_RATE_WEIGHT
value_c = this bssid beacon frame’s data rate, after test following number show, 802.11n = -28 802.11bg = -10 802.11b = -2 802.11a = -10 s_rssi calculation:
s_rssi = value_d X MESH_SCORE_RSSI_WEIGHT
value_d = this bssid’s rssi print out from command 'cw_diag –c mesh-ap'. if rssi > 25, value_d = -1 if rssi <=25, value_d = 0 s_band calculation:
s_band = value_e X MESH_SCORE_BAND_WEIGHT
value_e = this bssid broadcast at 2.4 GHz or 5 GHz band 2.4GHz = 0 5 GHz = 1
This information can be found in the below output from the FortiAP CLI.
Links: FortiAP CLI config and commands:
FortiAP mesh config:
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