01-21-2025 01:28 PM
Got a "new to me" AP1852i I'm trying to reuse as a home AP in Mobility Express mode.
Initial test shows me it work perfectly well in 2.4GHz, but I'm unable to see anything broadcasted in 5GHz.
Already confirmed setting "Canada" as the country for Domain "A" and good NTP sync.
5GHz radio looks to be properly enabled from the logs and UI, but still can't see the SSID from devices nor other APs on the Cisco UI when there should be at least a few.
Including a "show tech-support" in case there's something I missed.
Solved! Go to Solution.
01-21-2025 01:50 PM
Tech-support is amazing.
I can see two possible issue
** show lldp inline_power ***** Power_Requested(mW) Power_Available(mW) Port_ID Negotiation-failed Negotiation-failed
Something related to Power, If you are using PoE. Usually when AP face problem with power it disable on radiio.
Or, the 80Mhz Channel you are using in 5.0ghz. We can see below that Beacons RX is zero and Beacons TX is huge.
This means that the AP is not receiveing data from clients
Dot11Radio1 Link encap:Ethernet HWaddr F8:B7:E2:C5:93:80
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:2699
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:90 Memory:f3800000-f3a00000
DOT11 Statistics (Cumulative Total/Last 5 Seconds):
RECEIVER TRANSMITTER
Host Rx K Bytes: 0/0 Host Tx K Bytes: 0/0
Unicasts Rx: 0/0 Unicasts Tx: 0/0
Broadcasts Rx: 0/0 Broadcasts Tx: 0/0
Beacons Rx: 0/0 Beacons Tx: 6364/45
Probes Rx: 0/0 Probes Tx: 0/0
Multicasts Rx: 0/0 Multicasts Tx: 0/0
Mgmt Packets Rx: 0/0 Mgmt Packets Tx: 0/0
Ctrl Frames Rx: 0/0 Ctrl Frames Tx: 0/0
RTS received: 0/0 RTS transmitted: 0/0
Duplicate frames: 0/0 CTS not received: 0/0
MIC errors: 0/0 WEP errors: 0/0
FCS errors: 0/0 Retries: 0/0
Key Index errors: 0/0 Tx Failures: 0/0
Tx Drops: 0/0
For 2.4 Ghz is totally different
***** show interfaces dot11Radio 0 statistics *****
Dot11Radio Statistics:
DOT11 Statistics (Cumulative Total/Last 5 Seconds):
RECEIVER TRANSMITTER
Host Rx K Bytes: 0/0 Host Tx K Bytes: 0/0
Unicasts Rx: 0/0 Unicasts Tx: 0/0
Broadcasts Rx: 0/0 Broadcasts Tx: 0/0
Beacons Rx: 56429/370 Beacons Tx: 7360/49
Probes Rx: 3019/23 Probes Tx: 2/0
Multicasts Rx: 0/0 Multicasts Tx: 0/0
Mgmt Packets Rx: 77804/460 Mgmt Packets Tx: 0/0
Ctrl Frames Rx: 0/0 Ctrl Frames Tx: 0/0
RTS received: 0/0 RTS transmitted: 0/0
Duplicate frames: 0/0 CTS not received: 0/0
MIC errors: 0/0 WEP errors: 0/0
FCS errors: 1000/3 Retries: 0/0
Key Index errors: 0/0 Tx Failures: 0/0
Tx Drops: 0/0
01-21-2025 01:33 PM
I will send you PM tomorrow
Thanks
MHM
01-22-2025 04:01 PM
Really, still, more PMs ...
01-21-2025 01:45 PM
Console into the AP and enter the command "capwap ap mode local".
01-21-2025 01:50 PM
Tech-support is amazing.
I can see two possible issue
** show lldp inline_power ***** Power_Requested(mW) Power_Available(mW) Port_ID Negotiation-failed Negotiation-failed
Something related to Power, If you are using PoE. Usually when AP face problem with power it disable on radiio.
Or, the 80Mhz Channel you are using in 5.0ghz. We can see below that Beacons RX is zero and Beacons TX is huge.
This means that the AP is not receiveing data from clients
Dot11Radio1 Link encap:Ethernet HWaddr F8:B7:E2:C5:93:80
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:2699
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:90 Memory:f3800000-f3a00000
DOT11 Statistics (Cumulative Total/Last 5 Seconds):
RECEIVER TRANSMITTER
Host Rx K Bytes: 0/0 Host Tx K Bytes: 0/0
Unicasts Rx: 0/0 Unicasts Tx: 0/0
Broadcasts Rx: 0/0 Broadcasts Tx: 0/0
Beacons Rx: 0/0 Beacons Tx: 6364/45
Probes Rx: 0/0 Probes Tx: 0/0
Multicasts Rx: 0/0 Multicasts Tx: 0/0
Mgmt Packets Rx: 0/0 Mgmt Packets Tx: 0/0
Ctrl Frames Rx: 0/0 Ctrl Frames Tx: 0/0
RTS received: 0/0 RTS transmitted: 0/0
Duplicate frames: 0/0 CTS not received: 0/0
MIC errors: 0/0 WEP errors: 0/0
FCS errors: 0/0 Retries: 0/0
Key Index errors: 0/0 Tx Failures: 0/0
Tx Drops: 0/0
For 2.4 Ghz is totally different
***** show interfaces dot11Radio 0 statistics *****
Dot11Radio Statistics:
DOT11 Statistics (Cumulative Total/Last 5 Seconds):
RECEIVER TRANSMITTER
Host Rx K Bytes: 0/0 Host Tx K Bytes: 0/0
Unicasts Rx: 0/0 Unicasts Tx: 0/0
Broadcasts Rx: 0/0 Broadcasts Tx: 0/0
Beacons Rx: 56429/370 Beacons Tx: 7360/49
Probes Rx: 3019/23 Probes Tx: 2/0
Multicasts Rx: 0/0 Multicasts Tx: 0/0
Mgmt Packets Rx: 77804/460 Mgmt Packets Tx: 0/0
Ctrl Frames Rx: 0/0 Ctrl Frames Tx: 0/0
RTS received: 0/0 RTS transmitted: 0/0
Duplicate frames: 0/0 CTS not received: 0/0
MIC errors: 0/0 WEP errors: 0/0
FCS errors: 1000/3 Retries: 0/0
Key Index errors: 0/0 Tx Failures: 0/0
Tx Drops: 0/0
01-21-2025 02:48 PM
@Flavio Miranda wrote:I can see two possible issue
** show lldp inline_power ***** Power_Requested(mW) Power_Available(mW) Port_ID Negotiation-failed Negotiation-failedSomething related to Power, If you are using PoE. Usually when AP face problem with power it disable on radiio.
Or, the 80Mhz Channel you are using in 5.0ghz. We can see below that Beacons RX is zero and Beacons TX is huge.
This means that the AP is not receiveing data from clients
POE is currently using a generic 802.3af injector indeed, but I've also tried using a direct DC 48V with no better result.
I did notice it's not receiving anything from the 5GHz counters.
Also reading all over the NET that the AP18xx generation was known for a high defect rate. I'm almost resigned this could be explained by 5GHz radio failure.
01-21-2025 02:49 PM
@pierre233 wrote:
Also reading all over the NET that the AP18xx generation was known for a high defect rate. I'm almost resigned this could be explained by 5GHz radio failure.
RMA the AP before the End-of-Support date.
01-21-2025 02:57 PM - edited 01-21-2025 03:06 PM
It can be a faulty AP but, as per the logs, the AP is sending beacons on 5ghz radio. Try to lower the channel width to 20 or 40 mhz. Maybe your client is not able to join in 80mhz channel.
01-22-2025 10:17 AM
@Flavio Miranda wrote:Try to lower the channel width to 20 or 40 mhz.
I've tried with both 20 or 40 mhz as per your suggestion with no improvement. Switching manually to different channels too. Noise floor is permanently -128dbm on the 4 antennas.
01-22-2025 10:18 AM
Well, last idea is check the power failure. Rather than that, I would move to AP replacement.
01-22-2025 04:10 PM
Powering options |
● 802.3at
● Enhanced PoE
● Cisco power injector, AIR-PWRINJ4=
● Cisco local power supply, AIR-PWR-C=
● Cisco power injector, AIR-PWRINJ5= ( Note: this injector supports 802.3af only)
● 802.3af
Note: If 802.3af PoE is the source of power, (1) the 1852e 2.4-GHz radio will shift to 2x3 from 3x4, (2) The USB port and AUX Ethernet port are disabled on both the 1852i and 1852e. |
AP requires 802.3at for normal operation but it should still power the 5GHz radio 802.3af 15.4W.
Your power injector must support CDP or LLDP for correct PoE operation.
But in this case I tend to agree with the hardware failure option so like Leo says RMA before end of support date:
https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1850-series-access-points/datasheet-c78-734256.html#Warrantyinformation
You do technically need original proof of purchase for the limited lifetime warranty.
01-22-2025 10:31 AM
Show capwap client config <<- share this
MHM
01-22-2025 04:36 PM
@MHM Cisco World wrote:Show capwap client config <<- share this
Here's the result following yet another "capwap ap erase /all" and then reset config from Mobility Express interface. Powered directly from a 48V "Local Power Supply" brick and set to channel 149/20Mhz.
No change, but I'm including the capture.
Opening TAC for RMA isn't an option I fear as I'm not the original owner and Bill/PO is not avail.
I believe after this one, it's safe to say we covered config issues and my best option is to return it to the reseller.
01-22-2025 04:56 PM
Agreed <smile>
01-22-2025 05:26 PM
@pierre233 wrote:
Opening TAC for RMA isn't an option I fear as I'm not the original owner and Bill/PO is not avail.
Call Cisco TAC and, at the very least, TRY.
The worse TAC will respond with is "NO".
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