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This chapter provides troubleshooting procedures for basic problems with the access point. For the most up-to-date, detailed troubleshooting information, refer to the Cisco Technical Support and Documentation website at the following URL:
You should keep these guidelines in mind when you use the access points:
In Layer 3 operation, the access point and the controller can be on the same or different subnets. The access point communicates with the controller using standard IP packets. A Layer 3 access point on a different subnet than the controller requires a DHCP server on the access point subnet and a route to the controller. The route to the controller must have destination UDP ports 12222 and 12223 open for CAPWAP communications. The route to the primary, secondary, and tertiary controllers must allow IP packet fragments.
– Your controllers are connected to switch ports that are configured as trunk ports.
– Your access points are connected to switch ports that are configured as untagged access ports.
– A DHCP server is reachable by your access points and has been configured with Option 43. Option 43 provides the IP addresses of the management interfaces of your controllers. Typically, a DHCP server can be configured on a Cisco switch.
– Optionally, a DNS server can be configured to enable CISCO-CAPWAP-CONTROLLER. Use local domain to resolve to the IP address of the management interface of your controller.
– Your controllers are configured and reachable by the access points.
– Your controllers are configured with the access point MAC addresses and the MAC filter list is enabled.
– Your switch must forward DHCP requests.
During deployment, the access points can experience convergence delays due to various causes. The following list identifies some operating conditions that can cause convergence delays:
The access point supports packet bridging between wired and wireless network connections. The same network must never be connected to multiple wired ports on an access point or on two bridged access points. A bridge loop causes network routing problems.
The controller DHCP server only assigns IP addresses to lightweight access points and wireless clients associated to an access point. It does not assign an IP address to other devices, including Ethernet bridging clients on the mesh access points.
If the signal on the access point backhaul channel has a high signal-to-noise ratio, it is possible for a MAP to connect to the controller, via parent node, but not be able to pass data traffic, such as pinging the access point. This can occur because the default data rate for backhaul control packets is set to 6 Mb/s, and the backhaul data rate set to auto by the user.
Before activating your access point, you must ensure that the access point MAC address has been added to the controller MAC filter list and that Mac Filter List is enabled.
Note The access point MAC address and barcode is located on the bottom of the unit. When two MAC addresses are shown, use the top MAC address.
To view the MAC addresses added to the controller MAC filter list, you can use the controller CLI or the controller GUI:
You can use DHCP Option 43 to provide a list of controller IP addresses to the access points, enabling the access point to find and join a controller. Refer to the product documentation for your DHCP server for instructions on configuring DHCP Option 43. For additional information, refer to the “Configuring DHCP Option 43” section.
If your access point is not working properly, look at the LEDs on the bottom of the unit. You can use them to quickly assess the status of the unit. Figure 3-1 shows the location of the access point LEDs.
Figure 3-1 Access Point LEDs - Shown on the Bottom of Model AIR-CAP1552E-x-K9
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Note It is expected that there will be small variations in LED color intensity and hue from unit to unit. This is within the normal range of the LED manufacturer specifications and is not a defect.
The access point LED signals are listed in Table 3-1 .
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Firmware failure. Contact your support organization for assistance. |
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Uplink port is operational (cable, fiber optic, or Ethernet). |
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Firmware failure. Contact your support organization for assistance. |
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Firmware failure. Contact your support organization for assistance. |
2.When the access point power supply is initially turned on, all LEDs are amber. |
To verify that your access point is associated to the controller, follow these steps:
Step 1 Log into your controller web interface using a web browser.
You can also use the controller CLI show ap summary command from the controller console port.
Step 2 Click Wireless, and verify that your access point MAC address is listed under Ethernet MAC.
Step 3 Log out of the controller, and close your web browser.
The bridge group name (BGN) controls the association of the access points to a RAP. BGNs can be used to logically group the radios to avoid different networks on the same channel from communicating with each other. This setting is also useful if you have more than one RAP in your network in the same area.
If you have two RAPs in your network in the same area (for more capacity), we recommend that you configure the two RAPs with different BGNs and on different channels.
The BGN is a string of ten characters maximum. A factory-set bridge group name (NULL VALUE) is assigned during manufacturing. It is not visible to you, but allows new access point radios to join a network of new access points. The BGN can be reconfigured from the Controller CLI and GUI. After configuring the BGN, the access point reboots.
After the access points are deployed and associated to the controller, the BGN should be changed from the default value to prevent the MAPs from attempting to associate to other mesh networks.
The BGN should be configured very carefully on a live network. You should always start with the most distant access point (last node) from the RAP and move towards the RAP. If you start configuring the BGN in a different location, then the access points beyond this point (farther away) are dropped, as they have a different BGN.
To configure the BGN for the access points using the controller GUI, follow these steps:
Step 1 Log into your controller using a web browser.
Step 2 Click Wireless. When access points associates to the controller, the access point name appears in the AP Name list.
Step 3 Click on an access point name.
Step 4 Find the Mesh Information section, and enter the new BGN in the Bridge Group Name field.
Step 6 Repeat Steps 2 through 5 for each access point.
Step 7 Log out from your controller, and close your web browser.
If you need to monitor the access point locally (without connecting the access point to a wired LAN), you can connect a PC to its console port using a DB-9 to RJ-45 serial cable.
Note The console port should only be used for debugging in a lab environment.
Follow these steps to open the CLI by connecting to the access point console port:
Step 1 Open the hinged cover of the access point (see “Opening the Access Point Hinged Cover” section for instructions).
Connect a nine-pin, female DB-9 to RJ-45 serial cable to the RJ-45 console port on the access point and to the COM port on a computer (see Figure 3-2 and Figure 3-3 for the console port locations).
Figure 3-2 Console Port Location on Access Point Models AIR-CAP1552C-x-K9, AIR-CAP1552CU-x-K9, and AIR-CAP1552I-x-K9
Figure 3-3 Console Port Location on Access Point Models AIR-CAP1552E-x-K9 and AIR-CAP1552EU-x-K9
Note The Cisco part number for the DB-9 to RJ-45 serial cable is AIR-CONCAB1200. To order a serial cable, browse to:
http://www.cisco.com/pcgi-bin/marketplace/welcome.pl
Step 2 Set up a terminal emulator program on your PC to communicate with the access point. Use the following settings for the terminal emulator connection: 9600 baud, 8 data bits, no parity, 1 stop bit, and no flow control.
Step 3 When finished, remove your serial cable, and close the hinged cover (see the “Closing the Access Point Hinged Cover” section for instructions).
The power injector (AIR-PWRINJ1500-2=) has three LEDs on the front end of the case (see Figure 3-4). For detailed information on the power injector, see the Cisco Aironet 1550 Series Outdoor Mesh Access Point Power Injector Installation Instructions.
Figure 3-4 Power Injector Connectors and LEDs
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TO AP—Ethernet connector (RJ-45) to access point |
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TO SWITCH—Ethernet connector (RJ-45) to switch (10/100/1000BASE-T) |
You can use the power injector LEDs to check the power injector status. The LEDs provide the following status information:
The access point has a reset button located on the bottom of the unit (see Figure 3-5 and Figure 3-6). The reset button is recessed in a small hole that is sealed with a screw and a rubber gasket. The reset button can be used to perform these functions:
Figure 3-5 Reset Button Location - Models AIR-CAP1552E-x-K9 and AIR-CAP1552EU-x-K9
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Figure 3-6 Reset Button Location - Models AIR-CAP1552C-x-K9, AIR-CAP1552CU-x-K9, and AIR-CAP1552I-x-K9
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To reboot (power cycle) the access point, follow these steps:
Step 1 Use a Phillips screwdriver to remove the reset button screw (Figure 3-5). Be careful not to lose the screw.
Step 2 Use a straightened paperclip, and push the reset button for less than 10 seconds. This action causes the access point to reboot (power cycle), all LEDs to turn off for approximately 5 seconds, and then the LEDs to reactivate.
Step 3 Replace the reset button screw and use a Phillips screwdriver to tighten to 22 to 24 in. lbs
(2.49 to 2.71 Nm).
To disable battery backup power, follow these steps:
Step 1 Use a Phillips screwdriver to remove the reset button screw (Figure 3-5). Be careful not to lose the screw.
Step 2 Use a straightened paper clip and push the reset button for longer than 10 seconds.
Note If your access point does not contain a battery backup unit, the access point only reboots.
Note The battery backup unit is reactivated when the access point is rebooted (power cycled) again.
Step 3 Replace the reset button screw, and use a Phillips screwdriver to tighten to 22 to 24 in. lbs
(2.49 to 2.71 Nm).