Access Points do not show in CDP neighbor

[cpratt]

Hi All,

Last night I was performing mainteance on access points throughout the network. I was converting them from Local to H-REAP to allow for vlan support. The maintenance went well however afterwards I've noticed access points are not showing up in CDP neighbor and with a "show power inline" the access points shows as a IEEE PD. This is causing some weird issues where a client can connect but then will lose it's DHCP address. The problem happened on 9 of the 12 floors that I did this on and there is no configuration differences and bouncing the access points did not resolve the issue. The access points do show a blue light.

Has anyone ever experienced this before? If so what did you do to fix it?

I have a mix of 1131 and 1142N access points on a 4402 WLC running version 6.0.188.0.

Thank you,

Chris Pratt

[Scott Fella]

Chris,

The only time I have ran into that issue is when cabling was bad... Either the run or the patch cable. When I saw the power as IEEE I also noticed that the AP and switch didn't negotiate correctly. Another time I ran into that issue was when the switch couldnt power all the poe devices.

Sent from my iPhone

[nikhilcherian]

Chris,

  Are all the HREAP ap in trunk port

Thanks

NikhiL

[cpratt]

Hi Scott,

This is happening on multiple floors. It would be very odd for all those cables to have gone bad.

Hi Nikhil,

The ports are an access port.

[nikhilcherian]

If you are looking for multiple vlan support can you change the ports to trunk with native vlan as the management

Thanks

NikhiL

[cpratt]

I'm more concerned that the access points aren't being seen correctly by the switch and I believe it's not handling the traffic correctly. At this time I don't need multiple vlan support.

[Scott Fella]

Move one of the AP's to the switch directly to test.

Sent from my iPhone

[nikhilcherian]

Chris,

  Do you find any difference in switch port configurations in the switches were AP is up and were is dow

Thanks

NikhiL

[nikhilcherian]

Sry, missed the part that there is no change in configurations,

How are you bouncing the AP, shutting down the switch port of the resetting from the WLC

Thanks
NikhiL

[Leo Laohoo]

The maintenance went well however afterwards I've noticed access points are not showing up in CDP neighbor and with a "show power inline" the access points shows as a IEEE PD.

I see all the time.

"sh cdp neigh" shows nothing and "sh power inline" shows the port connected to the WAP as "IEEE".  This is mostly caused by faulty cabling.  If you have the right Cisco switch, you can test the cable using the in-built TDR feature.

Here's how you do it:

1.  Command:  test cable tdr interface

2.  Wait for about 5 to 7 seconds;

3.  Command:  sh cable tdr interface

4.  Please post the complete output. 

[saramoghaddasian]

Thanks A lot,I had the same problem and it was solved with your solution

[abdulhmalik]

Im facing this issue with brand new 3802 APs . Here's the output

SW#show cable-diagnostics tdr interface gig 1/0/10
TDR test last run on: April 17 09:41:40

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/10 1000M Pair A 1 +/- 10 meters N/A Open
Pair B 2 +/- 10 meters N/A Open
Pair C 1 +/- 10 meters N/A Open
Pair D 1 +/- 10 meters N/A Open

SW#test cable tdr int gig 1/0/11
TDR test started on interface Gi1/0/11
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.

SW#show cable-diagnostics tdr interface gig 1/0/11
TDR test last run on: April 17 09:42:38

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/11 auto Pair A 0 +/- 10 meters N/A Open
Pair B 1 +/- 10 meters N/A Open
Pair C 1 +/- 10 meters N/A Open
Pair D 1 +/- 10 meters N/A Open



SW#test cable tdr int gig 1/0/12
TDR test started on interface Gi1/0/12
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.

SW#show cable-diagnostics tdr interface gig 1/0/11
Apr 17 09:43:02: %SFF8472-5-THRESHOLD_VIOLATION: Gi1/0/49: Rx power low warning; Operating value: -21.2 dBm, Threshold value: -19.0 dBm.

SW#show cable-diagnostics tdr interface gig 1/0/12
Apr 17 09:43:02: SNMP: Queuing packet to 10.95.1.32
Apr 17 09:43:02: SNMP: V2 Trap, reqid 791, errstat 0, erridx 0
sysUpTime.0 = 102599912
snmpTrapOID.0 = entSensorThresholdNotification
entSensorThresholdValue.1070.3 = -190
entSensorValue.1070 = -209
Apr 17 09:43:02: SNMP: Packet sent via UDP to 10.95.1.32

SW#show cable-diagnostics tdr interface gig 1/0/12
TDR test last run on: April 17 09:42:56

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/12 auto Pair A 0 +/- 10 meters N/A Open
Pair B 0 +/- 10 meters N/A Open
Pair C 0 +/- 10 meters N/A Open
Pair D 0 +/- 10 meters N/A Open

[cpratt]

figured out the problem. Needed to make the switch port a trunk and change the native vlan. Thanks all for the input

Sent from Cisco Technical Support iPad App

[Totto]

Hi,

Changue the port to trunk, work for me,

thanks

[hbaytie01]

If the AP is in FlexConnect mode, then you have to make sure that the configuration on the switchport is mode trunk with the native VLAN to be the management. I faced this issue once I have my flexConnect AP and the switchport mode was access, i wasn't able to see the AP in CDP neighbors.