I was troubleshooting some lightweight APs that were connected on a Cisco 3650 PoE
switch and two of them can't seem to associate with the WLC. I've checked the
WLC config is correct since three APs were registered and wireless clients got associated to them. So I troubleshoot the switch to see if there's any Layer 1 or Layer 2 issues but it can't detect the said APs. I tried to move the AP to another port on the switch but it's still
down when I do a show cdp neighbor command.
Switch#show interface status
Port Name Status Vlan Duplex Speed Type
Gi1/0/1 | AP | notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/2 | AP | connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/3 | AP | connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/4 | AP | notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/5 | AP | connected 1 a-full a-1000 10/100/1000BaseTX
Switch#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
sw03 Gig 1/1/2 169 S I WS-C3560- Gig 0/1
ap03 Gig 1/0/3 164 R T AIR-CAP16 Gig 0.1
ap02 Gig 1/0/2 173 R T AIR-CAP16 Gig 0.1
ap05 Gig 1/0/5 143 R T AIR-CAP16 Gig 0.1
Switch#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 390.0 77.0 313.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 15.4 Ieee PD 3 30.0
Gi1/0/2 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/3 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/4 auto on 15.4 Ieee PD 3 30.0
Gi1/0/5 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Switch#show version
<OUTPUT TRUNCATED>
Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 52 WS-C3650-48PS 03.06.04.E cat3k_caa-universalk9 INSTALL
There's a built-in Time Domain Reflectometer (TDR) feature on a Cisco switch which is similar to what a cable tester does. The switch detected an "open" circuit where the problematic APs are connected. This could mean the cable is broken or there's no pin contact (due to improper crimp). Below is a summary and meaning for the cable pair status output:
Switch#test cable ?
tdr test TDR on interface
Switch#test cable tdr ?
interface Specify an interface for test
Switch#test cable tdr interface ?
GigabitEthernet GigabitEthernet IEEE 802.3z
Switch#test cable tdr interface GigabitEthernet1/0/1
TDR test started on interface Gi1/0/1
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
Switch#show cable-diagnostics ?
tdr show TDR result
Switch#show cable-diagnostics tdr ?
interface Specify an interface for result
Switch#show cable-diagnostics tdr interface ?
GigabitEthernet GigabitEthernet IEEE 802.3z
Switch#show cable-diagnostics tdr interface GigabitEthernet1/0/1
TDR test last run on: September 06 06:00:24
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/1 auto Pair A 5 +/- 10 meters N/A Normal
Pair B 4 +/- 10 meters N/A Normal
Pair C 5 +/- 10 meters N/A Normal
Pair D 3 +/- 5 meters N/A Open
Switch#test cable tdr interface GigabitEthernet1/0/2 // AP IS NORMALLY DETECTED ON THIS PORT; THE WORKING PORT WILL BOUNCE IF TDR IS PERFORMED
TDR test started on interface Gi1/0/2
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
Switch#
Sep 6 06:02:28.021: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2,
changed state to down
Sep 6 06:02:29.023: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to down
Sep 6 06:02:31.913: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to up
Sep 6 06:02:32.911: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2,
changed state to up
Switch#show cable-diagnostics tdr interface GigabitEthernet1/0/2
TDR test last run on: September 06 06:02:26
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/2 1000M Pair A 17 +/- 10 meters N/A Normal
Pair B 15 +/- 10 meters N/A Normal
Pair C 15 +/- 10 meters N/A Normal
Pair D 15 +/- 10 meters N/A Normal
I moved the APs to another port but it's still down.
Switch#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 390.0 77.0 313.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 15.4 Ieee PD 3 30.0
Gi1/0/2 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/3 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/4 auto off 0.0 n/a n/a 30.0
Gi1/0/5 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/6 auto on 15.4 Ieee PD 3 30.0
Switch#test cable tdr interface GigabitEthernet1/0/6
TDR test started on interface Gi1/0/6
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
Switch#show cable-diagnostics tdr interface GigabitEthernet1/0/6
TDR test last run on: September 06 06:18:46
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/6 auto Pair A 42 +/- 10 meters N/A Normal
Pair B 39 +/- 10 meters N/A Normal
Pair C 40 +/- 5 meters N/A Open // SAME TDR RESULT ON PORT G1/0/4
Pair D 42 +/- 10 meters N/A Normal
So I asked a tech to replace the cable run from the patch panel in the main server room going to the wall jack where the AP is mounted. I was able to detect the other AP by just moving the cable to another port on the patch panel.
Switch#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 390.0 77.0 313.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/2 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/3 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/4 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/5 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Switch#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
ap03 Gig 1/0/3 165 R T AIR-CAP16 Gig 0.1
ap02 Gig 1/0/2 129 R T AIR-CAP16 Gig 0.1
ap01 Gig 1/0/1 174 R T AIR-CAP16 Gig 0.1
ap05 Gig 1/0/5 171 R T AIR-CAP16 Gig 0.1
ap04 Gig 1/0/4 175 R T AIR-CAP16 Gig 0.1
Switch#show interface status
Port Name Status Vlan Duplex Speed Type
Gi1/0/1 | AP | notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/2 | AP | connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/3 | AP | connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/4 | AP | notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/5 | AP | connected 1 a-full a-1000 10/100/1000BaseTX
Switch#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
sw03 Gig 1/1/2 169 S I WS-C3560- Gig 0/1
ap03 Gig 1/0/3 164 R T AIR-CAP16 Gig 0.1
ap02 Gig 1/0/2 173 R T AIR-CAP16 Gig 0.1
ap05 Gig 1/0/5 143 R T AIR-CAP16 Gig 0.1
Switch#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 390.0 77.0 313.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 15.4 Ieee PD 3 30.0
Gi1/0/2 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/3 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/4 auto on 15.4 Ieee PD 3 30.0
Gi1/0/5 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Switch#show version
<OUTPUT TRUNCATED>
Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 52 WS-C3650-48PS 03.06.04.E cat3k_caa-universalk9 INSTALL
There's a built-in Time Domain Reflectometer (TDR) feature on a Cisco switch which is similar to what a cable tester does. The switch detected an "open" circuit where the problematic APs are connected. This could mean the cable is broken or there's no pin contact (due to improper crimp). Below is a summary and meaning for the cable pair status output:
tdr test TDR on interface
Switch#test cable tdr ?
interface Specify an interface for test
Switch#test cable tdr interface ?
GigabitEthernet GigabitEthernet IEEE 802.3z
Switch#test cable tdr interface GigabitEthernet1/0/1
TDR test started on interface Gi1/0/1
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
Switch#show cable-diagnostics ?
tdr show TDR result
Switch#show cable-diagnostics tdr ?
interface Specify an interface for result
Switch#show cable-diagnostics tdr interface ?
GigabitEthernet GigabitEthernet IEEE 802.3z
Switch#show cable-diagnostics tdr interface GigabitEthernet1/0/1
TDR test last run on: September 06 06:00:24
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/1 auto Pair A 5 +/- 10 meters N/A Normal
Pair B 4 +/- 10 meters N/A Normal
Pair C 5 +/- 10 meters N/A Normal
Pair D 3 +/- 5 meters N/A Open
Switch#test cable tdr interface GigabitEthernet1/0/2 // AP IS NORMALLY DETECTED ON THIS PORT; THE WORKING PORT WILL BOUNCE IF TDR IS PERFORMED
TDR test started on interface Gi1/0/2
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
Switch#
Sep 6 06:02:28.021: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2,
changed state to down
Sep 6 06:02:29.023: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to down
Sep 6 06:02:31.913: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to up
Sep 6 06:02:32.911: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2,
changed state to up
Switch#show cable-diagnostics tdr interface GigabitEthernet1/0/2
TDR test last run on: September 06 06:02:26
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/2 1000M Pair A 17 +/- 10 meters N/A Normal
Pair B 15 +/- 10 meters N/A Normal
Pair C 15 +/- 10 meters N/A Normal
Pair D 15 +/- 10 meters N/A Normal
I moved the APs to another port but it's still down.
Switch#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 390.0 77.0 313.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 15.4 Ieee PD 3 30.0
Gi1/0/2 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/3 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/4 auto off 0.0 n/a n/a 30.0
Gi1/0/5 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/6 auto on 15.4 Ieee PD 3 30.0
Switch#test cable tdr interface GigabitEthernet1/0/6
TDR test started on interface Gi1/0/6
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
Switch#show cable-diagnostics tdr interface GigabitEthernet1/0/6
TDR test last run on: September 06 06:18:46
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/6 auto Pair A 42 +/- 10 meters N/A Normal
Pair B 39 +/- 10 meters N/A Normal
Pair C 40 +/- 5 meters N/A Open // SAME TDR RESULT ON PORT G1/0/4
Pair D 42 +/- 10 meters N/A Normal
So I asked a tech to replace the cable run from the patch panel in the main server room going to the wall jack where the AP is mounted. I was able to detect the other AP by just moving the cable to another port on the patch panel.
Switch#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 390.0 77.0 313.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/2 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/3 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/4 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Gi1/0/5 auto on 15.4 AIR-CAP1602E-E-K9 3 30.0
Switch#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
ap03 Gig 1/0/3 165 R T AIR-CAP16 Gig 0.1
ap02 Gig 1/0/2 129 R T AIR-CAP16 Gig 0.1
ap01 Gig 1/0/1 174 R T AIR-CAP16 Gig 0.1
ap05 Gig 1/0/5 171 R T AIR-CAP16 Gig 0.1
ap04 Gig 1/0/4 175 R T AIR-CAP16 Gig 0.1
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