AP130 DFS HiveManager NG

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  • Updated 2 years ago
We have some AP130 with DFS enabled in HiveManager NG but it doesn't look like any of the AP's are choosing DFS channels. I thought that AP130s were certified for DFS? Running golden code 6.5r4, and I can't find much for documentation. 

Thanks,
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Rob Burgoyne

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Posted 2 years ago

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Jonas Dekkers

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Hi, I have found this article: http://boundless.aerohive.com/technology/do-aerohive-access-points-support-5ghz-dfs-channels-another...

Have you set the correct country code on the access points?
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Brian Powers, Champ

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If you do a show acsp channel detail on the AP, you'll see a glimpse of what the AP uses for channel calculation.  The DFS channels default to a cost value of 16 (still...).  So unless the interference, utilization, CRCs pushes the UNII-1/3 bands to over a cost value of 16, the AP will rarely choose a UNII-2/2e channel.

AP here at my office below for reference.  The lower the cost, the more likely the channel to be chosen.  If you've set your APs to auto w/40 MHz wide channels, note they will also default to the lower of the bonded channel for the primary channel (similar to how you could choose 40 MHz-upper/lower in the 802.11n days).  

There's unfortunately not much you can do to influence the ACSP algorithm outside of statically assigning channels on your APs.

ap#show acsp ch de
wifi1 (11): 
State: RUN
Lowest cost channel: 44, lowest-cost: 0
Lastest scan type: Normal Scan
Overall average RSSI: 0
Hive id: hm01-mar.marion.in.ena.net
Scanned channels: 21
Scan timestamp: 291 seconds after the AP last rebooted
Interference alert triggered channel re-evaluation: 0

Channel 36 Cost:15 
Probability factor: 0
Channel deduction: 0 (CU: 0%, TxU: 0%, IU: 0%, CRC: 0%)
Neighbor adjustments: 15
Neighboring access points: 2
Maximum RSSI among same hive neighbors: 12
Aggregate interference 0
Interference number: 0
Penalty on channel: 12
                Wide channel penalty: 12
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 17 dBm)

Channel 40 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 2%, TxU: 0%, IU: 2%, CRC: 0%)
Neighbor adjustments: 2
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 6
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 17 dBm)

Channel 44 Cost:0 
Probability factor: 0
Channel deduction: 0 (CU: 4%, TxU: 0%, IU: 3%, CRC: 1%)
Neighbor adjustments: 0
Neighboring access points: 1
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
                Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 17 dBm)

Channel 48 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 3%, TxU: 0%, IU: 3%, CRC: 1%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 17 dBm)

Channel 52 Cost:16 
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
                Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 56 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 60 Cost:16 
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
        Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 64 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 2%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 10
Neighboring access points: 1
Maximum RSSI among same hive neighbors: 0
Aggregate interference 9
Interference number: 1
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 100 Cost:16 
        Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 104 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
        Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 108 Cost:16 
Probability factor: 0
Channel deduction: 0 (CU: 2%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 112 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
                Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 116 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 2
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 132 Cost:23 
Probability factor: 0
Channel deduction: 0 (CU: 2%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 7
Neighboring access points: 1
Maximum RSSI among same hive neighbors: 4
Aggregate interference 0
                Interference number: 0
Penalty on channel: 4
Wide channel penalty: 4
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 136 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 2
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 140 Cost:16 
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
                Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 24 dBm)

Channel 149 Cost:21 
Probability factor: 0
Channel deduction: 0 (CU: 5%, TxU: 0%, IU: 2%, CRC: 0%)
Neighbor adjustments: 21
Neighboring access points: 3
Maximum RSSI among same hive neighbors: 17
Aggregate interference 2
Interference number: 1
Penalty on channel: 25
Wide channel penalty: 26
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 30 dBm)

Channel 153 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
        Neighbor adjustments: 4
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 2
Wide channel penalty: 14
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 30 dBm)

Channel 157 Cost:21 
Probability factor: 0
Channel deduction: 0 (CU: 3%, TxU: 1%, IU: 1%, CRC: 0%)
Neighbor adjustments: 21
Neighboring access points: 1
Maximum RSSI among same hive neighbors: 22
Aggregate interference 7
Interference number: 1
Penalty on channel: 22
Wide channel penalty: 23
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 30 dBm)

Channel 161 Cost:32767 (offset)
        Probability factor: 0
Channel deduction: 0 (CU: 2%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 17
Neighboring access points: 2
Maximum RSSI among same hive neighbors: 0
Aggregate interference 20
Interference number: 2
Penalty on channel: 3
Wide channel penalty: 14
Overlapping channel adjustments: 0
Tx power limit adjustments: 0 (Max Tx power: 30 dBm)

Channel 165 Cost:32767 (offset)
Probability factor: 0
Channel deduction: 0 (CU: 1%, TxU: 0%, IU: 1%, CRC: 0%)
Neighbor adjustments: 0
Neighboring access points: 0
Maximum RSSI among same hive neighbors: 0
Aggregate interference 0
Interference number: 0
Penalty on channel: 0
Wide channel penalty: 0
Overlapping channel adjustments: 0
        Tx power limit adjustments: 0 (Max Tx power: 30 dBm)
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Rob Burgoyne

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Thanks, yeah I am seeing the same thing you are. We have a fairly dense deployment of AP130s using 20Mhz bandwidth on 5Ghz and I figured at least some of them would move over to DFS channels but it doesnt look like it. I'm going to dig in a bit and see if we are actually seeing any CCI on the 5Ghz or if we really are that lucky. 

Coming from the Aruba world, their AP's would almost always hop over to DFS channels when enabled and we would almost always see a decent improvement in WiFi performance, especially when using 40Mhz and 80Mhz.