Network Guys

Share your knowledge!

Building up a Cisco mobility express environment

First, order a new PoE+ Injector with 30 Watt output (IEEE 802.3at) -.- after some hours, not seeing the SSID, I figured out that the new 2800 and 3800 access points won’t start their radio-interfaces if the AP doesn’t get enough power. You can convert any controller-based access point to a “configurable” (formerly (autonomous) by changing the software image. You can download it at with your CCO ID and a registered SmartNet contract.

Start your access point and connect your serial cable to the Console port. You will see booting up a CAPWAP device. Wait long enough, the AP will start a small version of the wireless LAN controller software. After this you can configure your WLC like this:

Would you like to terminate autoinstall? [yes]: yes
Enter Administrative User Name (24 characters max): MyName
Enter Administrative Password (3 to 24 characters): *****
Re-enter Administrative Password : *****
System Name [Cisco_4d:2c:00] (31 characters max): 3800
Enter Country Code list (enter ‘help’ for a list of countries) [US]: DE
Configure a NTP server now? [YES][no]: no
Configure the system time now? [YES][no]: yes
Enter the date in MM/DD/YY format: 03/29/17
Enter the time in HH:MM:SS format: 15:19:30
Enter timezone location index (enter ‘help’ for a list of timezones): help
1. (GMT-12:00) International Date Line
2. (GMT-11:00) Samoa 3. (GMT-10:00) Hawaii
4. (GMT -9:00) Alaska 5. (GMT -8:00) Pacific Time
6. (GMT -7:00) Mountain Time 7. (GMT -6:00) Central Time
8. (GMT -5:00) Eastern Time 9. (GMT -4:00) Altantic Time
10. (GMT -3:00) Buenos Aires 11. (GMT -2:00) Mid-Atlantic
12. (GMT -1:00) Azores 13. (GMT) London, Lisbon, Dublin
14. (GMT +1:00) Amsterdam,Berlin,Rome 15. (GMT +2:00) Jerusalem
16. (GMT +3:00) Baghdad 17. (GMT +4:00) Muscat, Abu Dhabi
18. (GMT +4:30) Kabul 19. (GMT +5:00) Karachi, Tashkent
20. (GMT +5:30) Colombo, New Delhi 21. (GMT +5:45) Kathmandu
22. (GMT +6:00) Almaty, Novosibirsk 23. (GMT +6:30) Rangoon
24. (GMT +7:00) Hanoi, Bangkok 25. (GMT +8:00) HongKong, Beijing
26. (GMT +9:00) Tokyo, Osaka, Seoul 27. (GMT +9:30) Darwin
28. (GMT+10:00) Sydney, Melbourne 29. (GMT+11:00) Solomon Is.
30. (GMT+12:00) Auckland, Fiji
Enter timezone location index (enter ‘help’ for a list of timezones): 14
Management Interface IP Address:
Management Interface Netmask:
Management Interface Default Router:
Cleaning up Provisioning SSID
Create Management DHCP Scope? [yes][NO]: no
Create Employee Network? [YES][no]: yes
Employee Network Name (SSID)?: WiFiSurvey
Employee VLAN Identifier? [MGMT][1-4095]:
Employee Network Security? [PSK][enterprise]:
Employee PSK Passphrase (8-38 characters)?: *****
Re-enter Employee PSK Passphrase: *****
Create Guest Network? [yes][NO]: no
Enable RF Parameter Optimization? [YES][no]: yes
Client Density [TYPICAL][Low][High]: typical
Traffic with Voice [NO][Yes]: no

Configuration correct? If yes, system will save it and reset. [yes][NO]: yes
Cleaning up Provisioning SSID

Configuration saved!
Resetting system with new configuration…


after the restart, login with your username and password and activate the webinterface:

(Cisco Controller) >config network webmode enable

You can now access and configure your new WLC:

you can now change your SSID or your AP name and details:

Especially for site surveys, you need to edit the tx transmit power levels. I found a bug in the web GUI, even if you change the transmit power manually, the entry shows “Automatic” but you can do it with CLI:

config 802.11a disable 3800-AP
config 802.11a txPower ap 3800-AP 4
config 802.11a enable 3800-AP

config 802.11-abgn disable 3800-AP
config 802.11-abgn txPower ap 3800-AP 3
config 802.11-abgn enable 3800-AP

you can check the power-level with the commands “show advanced 802.11-abgn summary” and show advanced 802.11-a summary”. The configured power-levels are now active:

I hope that you can save much time with this topic ;)


4 Responses

    1. Hi Pat,

      no currently not, I configured them for a wifi survey :) The devices also need to ping their default-gateway, otherwise they won’t start their antennas.

  1. Ah ok ;)

    Thinking about deploying a few APs with ME instead of a WLC. But I need the roaming function. Did you test, what happens, when a AP loses his connection to the master AP?

Leave a Reply

Click on the button to load the content from

Load content

This site uses Akismet to reduce spam. Learn how your comment data is processed.


ekahau Certified Survey Engineer
Post Categories
Post Archives