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Cisco 1941 with AIR-CAP 1602E-E-K9 Managed by WLC

From Ever changing code

You will here find a basic configuration for AIR-CAP 1602E-E-K9 access point managed by Wireless Controller that connected to 4-port EHWIC card inserted into Cisco 1941 ISR G2 modular router. Orgianlly I was trying to configure this access point without WLC but then realized that it is impossible. However the valuable troubleshooting steps have been recorded here.

Product codding

Product/Model Number: AIR-CAP1602E-E-K9
IOS C1600 Software (AP1G2-RCVK9W8-M), Version 15.2(2)JB, RELEASE SOFTWARE (fc1)
LWAPP image version 7.4.1.37

                Regulatory Domain
               /
AIR-CAP 1602E-E-K9
     \       \_External antenna
      \_C_ stands for: Control and Provisioning of Wireless Access Points Protocol CAPWAP require WLC (Wireless Lan Controller)
       \_S_ stands for: Standalone AP
  • router needs to allow CAPWAP traffic on UDP ports 5246 and 5247
Router show inventory
#show inventory
NAME: "CISCO1941/K9", DESCR: "CISCO1941/K9 chassis, Hw Serial#: ***********, Hw Revision: 1.0"
PID: CISCO1941/K9      , VID: V05 , SN: ***********
NAME: "3G WWAN EHWIC-QuadBand HSPA+R7/HSPA/UMTS QuadBand EDGE/GPRS and GPS on Slot 0 SubSlot 0", DESCR: "3G WWAN EHWIC-QuadBand HSPA+R7/HSPA/UMTS QuadBand  EDGE/GPRS and GPS"
PID: EHWIC-3G-HSPA+7   , VID: V01 , SN: ***********
NAME: "Modem 0 on Cellular0/0/0", DESCR: "Sierra Wireless MC8705"
PID: MC8705            , VID: 1.0, SN: ***********
NAME: "4 Port GE POE EHWIC Switch on Slot 0 SubSlot 1", DESCR: "4 Port GE POE EHWIC Switch"
PID: EHWIC-4ESG-P      , VID: V01 , SN: ***********
NAME: "C1941 AC-POE Power Supply", DESCR: "C1941 AC-POE Power Supply"
PID: PWR-1941-POE      , VID:    , SN:

Please notice that access points are powered by Power Over Ethernet. There is a difference power consumption for AIR-CAP (managed) access point that uses 13W vs AIR-SAP (standalone) uses 15.4W.

#sh power inline
PowerSupply   SlotNum.   Maximum   Allocated       Status
-----------   --------   -------   ---------       ------
INT-PS           0        80.000    46.200         PS GOOD
Interface   Config   Device   Powered    PowerAllocated   State
---------   ------   ------   -------    --------------   -----
Gi0/1/0     auto     Unknown  Off        0.000 Watts      NOT_PHONE
Gi0/1/1     auto     IEEE-3   On        15.400 Watts      PHONE
Gi0/1/2     auto     IEEE-3   On        15.400 Watts      PHONE
Gi0/1/3     auto     IEEE-3   On        15.400 Watts      PHONE
Default account credentials on the access point
Username: Cisco
Password: Cisco
Enabled mode: Cisco

Connecting Light Weight Access Point without WLC

I connected AIR-CAP 1602E-E-K9 access point to EtherSwitch card on Cisco 1941 ISR G2 but because it does not have WLC capability it is not possible to manage AP. The output below, I have left just for future reference that could help to configure Router and APs when WLC is available.

Configure DHPC server to allow AP discover WLC

DHCP pool has been configured on the router
ip dhcp pool SW-POOL
 network 172.16.0.0 255.255.0.0
 default-router 172.16.0.1
 dns-server 8.8.4.4
 option 43 hex f108.ac10.0001 '<-- WLC ip address in hex, f108 is always there ac10.0001 it actual ip address
 option 60 ascii "Cisco AP c1600"  '<-- double quotes are required closing VCI string--'
 lease 0 2

EtherSwitch configuration

Port on EtherSwitch configured as access port, and VLAN20 interface configured with IP 172.16.0.1/16
Error messages on the AP
*Mar  1 01:15:27.886: %CAPWAP-3-DHCP_RENEW: Could not discover WLC using DHCP IP. Renewing DHCP IP.
*Mar  1 01:15:32.890: %CAPWAP-3-ERRORLOG: Invalid event 38 & state 2 combination.
*Mar  1 01:15:33.010: %DHCP-6-ADDRESS_ASSIGN: Interface BVI1 assigned DHCP address 172.16.0.63, mask 255.255.0.0, hostname AP6c41.6abb.0180

Translating "CISCO-CAPWAP-CONTROLLER"...domain server (8.8.4.4)

*Mar  1 01:15:38.886: %CAPWAP-5-DHCP_OPTION_43: Controller address 172.16.0.1 obtained through DHCP
*Mar  1 01:15:38.886: %CAPWAP-5-DHCP_OPTION_43: Controller address 0.1.4.126 obtained through DHCP
*Mar  1 01:15:38.886: %CAPWAP-3-ERRORLOG: Did not get log server settings from DHCP.
*Mar  1 01:15:38.886: %CAPWAP-3-ERRORLOG: Could Not resolve CISCO-CAPWAP-CONTROLLER
Not in Bound state.
*Mar  1 01:16:24.385: %CAPWAP-3-DHCP_RENEW: Could not discover WLC using DHCP IP. Renewing DHCP IP.

Where is AP management? is WLC missing on ISR G2 routers?

SRE is needed to provide WLC functionality. You can read more about it following this link Cisco Services-Ready Engine. It is worth it to mention that Cisco 1941 ISR G2 router can support only 1x Cisco SRE Internal Services Module (ISM).

These applications but not limited are supported on Cisco SRE Modules
  • Network services: Cisco Wireless LAN Controller (WLC), Infoblox Core Network Services, Cisco Prime™ Network Analysis Module (NAM), NetScout nGenius Integrated Agent, BlueCat Adonis DNS/DHCP and Proteus IPAM, LogLogic MX-Virtual Appliance, Visual Network Systems OmniPoint Element, Uplogix Local Management Platform
  • Application services: Cisco Wide Area Application Services (WAAS), Cisco UCS Express, Cisco Application Extension Platform (AXP)
  • Security: Cisco Video Surveillance, SecureLogix Voice Policy Firewall

References