Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
New Member

RRM Neighbor Message/RRM Neighbor Message dBm threshold/Recommended TPC settings

From reading Cisco’s Radio Resource Management under Unified Wireless Networks (Document ID: 71113) and the following Post (https://supportforums.cisco.com/discussion/10747596/configure-rrm-wlcs-avoid-interferences), I have a few questions which I am trying to get some clarification.

 

Questions

  1. What is the default dBM an AP needs to receive/ “hear” a Neighbor Message at? Towards the beginning of the document, it states “…WLCs will add neighbors to their lists given they are heard at greater than or equal to -80 dBm and will only then remove them once their signals dip below -85 dBm.”  However, towards the middle of the document, it states “the RF Group Leader will apply the TPC algorithm on a per-band, per-AP basis to adjust AP power transmit levels downward such that the third loudest neighbor AP will then be heard at a signal level of -70dBm (default value or what the configured value is) or lower and the TCP hysteresis condition is satisfied.”

 

  1. When a Neighboring AP is no longer “heard” at -85 dBm or better, is the RF coming from the AP considered interference, co-channel interference if the two APs are on the same channel, Foreign Interference, or noise?  I think it is co-interference but I am not sure.

 

 

  1. What are the recommended settings for the power?  Is it best practice to go with the defaults (Max 30 dBm/Min -10 dBm)? Reading the following post from Araon (https://supportforums.cisco.com/discussion/10747596/configure-rrm-wlcs-avoid-interferences) he recommended -74dBm based upon the output from the show ap auto-rf 802.11b <Cisco AP Name>.   I am open to suggestions. (Please note:  I do see this AP does not “hear” three other APs at -85 dBm or better. I understand this does affect RRM.)

Thank you,

 

T.J.

Following is the output from the show auto-rf 802.11command:

(DOCSADCWLC01) >show ap auto-rf 802.11b DOC-HQ-AP16.3

 

Number Of Slots.................................. 2

AP Name.......................................... DOC-HQ-AP16.3

MAC Address...................................... 4c:4e:35:60:45:96

  Slot ID........................................ 0

  Radio Type..................................... RADIO_TYPE_80211b/g

  Sub-band Type.................................. All

  Noise Information

    Noise Profile................................ PASSED

    Channel 1....................................  -88 dBm

    Channel 2....................................  -94 dBm

    Channel 3....................................  -95 dBm

    Channel 4....................................  -95 dBm

    Channel 5....................................  -94 dBm

    Channel 6....................................  -85 dBm

    Channel 7....................................  -94 dBm

    Channel 8....................................  -93 dBm

    Channel 9....................................  -78 dBm

    Channel 10...................................  -92 dBm

    Channel 11...................................  -93 dBm

  Interference Information

    Interference Profile......................... FAILED

    Channel 1.................................... -128 dBm @  0 % busy

    Channel 2.................................... -128 dBm @  0 % busy

    Channel 3.................................... -128 dBm @  0 % busy

    Channel 4.................................... -128 dBm @  0 % busy

    Channel 5.................................... -128 dBm @  0 % busy

    Channel 6....................................  -85 dBm @ 22 % busy

    Channel 7.................................... -128 dBm @  0 % busy

    Channel 8.................................... -128 dBm @  0 % busy

    Channel 9.................................... -128 dBm @  0 % busy

    Channel 10...................................  -60 dBm @  1 % busy

    Channel 11...................................  -82 dBm @  1 % busy

  Load Information

    Load Profile................................. PASSED

    Receive Utilization.......................... 0 %

    Transmit Utilization......................... 0 %

    Channel Utilization.......................... 69 %

    Attached Clients............................. 5 clients

  Coverage Information

    Coverage Profile............................. PASSED

    Failed Clients............................... 0 clients

  Client Signal Strengths

    RSSI -100 dbm................................ 0 clients

    RSSI  -92 dbm................................ 0 clients

    RSSI  -84 dbm................................ 0 clients

    RSSI  -76 dbm................................ 1 clients

    RSSI  -68 dbm................................ 1 clients

    RSSI  -60 dbm................................ 1 clients

    RSSI  -52 dbm................................ 2 clients

  Client Signal To Noise Ratios

    SNR    0 dB.................................. 0 clients

    SNR    5 dB.................................. 0 clients

    SNR   10 dB.................................. 0 clients

    SNR   15 dB.................................. 0 clients

    SNR   20 dB.................................. 0 clients

    SNR   25 dB.................................. 2 clients

    SNR   30 dB.................................. 0 clients

    SNR   35 dB.................................. 1 clients

    SNR   40 dB.................................. 1 clients

    SNR   45 dB.................................. 1 clients

  Nearby APs

    AP 2c:36:f8:0c:18:e0 slot 0..................  -58 dBm on   1 (192.168.1.7)

    AP 2c:36:f8:0c:3a:b0 slot 0..................  -93 dBm on   6 (192.168.1.7)

  Radar Information

  Channel Assignment Information

    Current Channel Average Energy...............  -78 dBm

    Previous Channel Average Energy..............  -62 dBm

    Channel Change Count......................... 1

    Last Channel Change Time..................... Fri Apr 11 12:00:14 2014

    Recommended Best Channel..................... 6

  RF Parameter Recommendations

    Power Level.................................. 2

    RTS/CTS Threshold............................ 2347

    Fragmentation Threshold...................... 2346

    Antenna Pattern.............................. 0

 

  Persistent Interference Devices

  Class Type                 Channel  DC (%%)  RSSI (dBm)  Last Update Time

  -------------------------  -------  ------  ----------  ------------------------

  All third party trademarks are the property of their respective owners.

 

(DOCSADCWLC01) >show ap auto-rf 802.11a DOC-HQ-AP16.3

 

Number Of Slots.................................. 2

AP Name.......................................... DOC-HQ-AP16.3

MAC Address...................................... 4c:4e:35:60:45:96

  Slot ID........................................ 1

  Radio Type..................................... RADIO_TYPE_80211a

  Sub-band Type.................................. All

  Noise Information

    Noise Profile................................ PASSED

    Channel 36...................................  -93 dBm

    Channel 40...................................  -91 dBm

    Channel 44...................................  -93 dBm

    Channel 48...................................  -92 dBm

    Channel 52...................................  -92 dBm

    Channel 56...................................  -91 dBm

    Channel 60...................................  -91 dBm

    Channel 64...................................  -90 dBm

    Channel 100..................................  -89 dBm

    Channel 104..................................  -90 dBm

    Channel 108..................................  -89 dBm

    Channel 112..................................  -90 dBm

    Channel 116..................................  -86 dBm

    Channel 132..................................  -85 dBm

    Channel 136..................................  -84 dBm

    Channel 140..................................  -88 dBm

    Channel 149..................................  -88 dBm

    Channel 153..................................  -81 dBm

    Channel 157..................................  -87 dBm

    Channel 161..................................  -85 dBm

    Channel 165..................................  -87 dBm

  Interference Information

    Interference Profile......................... PASSED

    Channel 36................................... -128 dBm @  0 % busy

    Channel 40................................... -128 dBm @  0 % busy

    Channel 44................................... -128 dBm @  0 % busy

    Channel 48................................... -128 dBm @  0 % busy

    Channel 52................................... -128 dBm @  0 % busy

    Channel 56................................... -128 dBm @  0 % busy

    Channel 60................................... -128 dBm @  0 % busy

    Channel 64................................... -128 dBm @  0 % busy

    Channel 100.................................. -128 dBm @  0 % busy

    Channel 104.................................. -128 dBm @  0 % busy

    Channel 108.................................. -128 dBm @  0 % busy

    Channel 112.................................. -128 dBm @  0 % busy

    Channel 116.................................. -128 dBm @  0 % busy

    Channel 132.................................. -128 dBm @  0 % busy

    Channel 136.................................. -128 dBm @  0 % busy

    Channel 140.................................. -128 dBm @  0 % busy

    Channel 149.................................. -128 dBm @  0 % busy

    Channel 153.................................. -128 dBm @  0 % busy

    Channel 157.................................. -128 dBm @  0 % busy

    Channel 161.................................. -128 dBm @  0 % busy

    Channel 165.................................. -128 dBm @  0 % busy

    Rogue Histogram (20/40_ABOVE/40_BELOW)

    .............................................

    Channel 36...................................  0/ 0/ 0

    Channel 40...................................  0/ 0/ 0

    Channel 44...................................  0/ 0/ 0

    Channel 48...................................  0/ 0/ 0

    Channel 52...................................  0/ 0/ 0

    Channel 56...................................  0/ 0/ 0

    Channel 60...................................  0/ 0/ 0

    Channel 64...................................  1/ 0/ 0

    Channel 100..................................  0/ 0/ 0

    Channel 104..................................  0/ 0/ 0

    Channel 108..................................  0/ 0/ 0

    Channel 112..................................  0/ 0/ 0

    Channel 116..................................  0/ 0/ 0

    Channel 132..................................  0/ 0/ 0

    Channel 136..................................  0/ 0/ 0

    Channel 140..................................  0/ 0/ 0

    Channel 149..................................  1/ 0/ 0

    Channel 153..................................  0/ 0/ 0

    Channel 157..................................  0/ 0/ 0

    Channel 161..................................  0/ 0/ 0

    Channel 165..................................  0/ 0/ 0

  Load Information

    Load Profile................................. PASSED

    Receive Utilization.......................... 0 %

    Transmit Utilization......................... 2 %

    Channel Utilization.......................... 5 %

    Attached Clients............................. 2 clients

  Coverage Information

    Coverage Profile............................. PASSED

    Failed Clients............................... 0 clients

  Client Signal Strengths

    RSSI -100 dbm................................ 0 clients

    RSSI  -92 dbm................................ 0 clients

    RSSI  -84 dbm................................ 0 clients

    RSSI  -76 dbm................................ 1 clients

    RSSI  -68 dbm................................ 1 clients

    RSSI  -60 dbm................................ 0 clients

    RSSI  -52 dbm................................ 0 clients

  Client Signal To Noise Ratios

    SNR    0 dB.................................. 0 clients

    SNR    5 dB.................................. 0 clients

    SNR   10 dB.................................. 0 clients

    SNR   15 dB.................................. 0 clients

    SNR   20 dB.................................. 1 clients

    SNR   25 dB.................................. 1 clients

    SNR   30 dB.................................. 0 clients

    SNR   35 dB.................................. 0 clients

    SNR   40 dB.................................. 0 clients

    SNR   45 dB.................................. 0 clients

  Nearby APs

    AP 2c:36:f8:0c:18:e0 slot 1..................  -76 dBm on  36 (192.168.1.7)

    AP 2c:36:f8:0c:67:40 slot 1..................  -80 dBm on  52 (192.168.1.7)

  Radar Information

  Channel Assignment Information

    Current Channel Average Energy............... unknown

    Previous Channel Average Energy.............. unknown

    Channel Change Count......................... 0

    Last Channel Change Time..................... Fri Apr 11 07:53:44 2014

    Recommended Best Channel..................... 64

  RF Parameter Recommendations

    Power Level.................................. 1

    RTS/CTS Threshold............................ 2347

    Fragmentation Threshold...................... 2346

    Antenna Pattern.............................. 0

 

 

Everyone's tags (1)
418
Views
0
Helpful
0
Replies
CreatePlease to create content