Cisco Cisco 2000 Series Wireless LAN Controller Informationshandbuch
Q. How does DHCP work with the WLC?
A. The WLC is designed to act as a DHCP relay agent to the external DHCP server and acts
like a DHCP server to the client. This is the sequence of events that occurs:
like a DHCP server to the client. This is the sequence of events that occurs:
Generally, WLAN is tied to an interface which is configured with a DHCP server.
1.
When the WLC receives a DHCP request from the client on a WLAN, it relays the
request to the DHCP server with its management IP address.
request to the DHCP server with its management IP address.
2.
The WLC shows its Virtual IP address, which must be a non−routable address,
usually configured as 1.1.1.1, as the DHCP server to the client.
usually configured as 1.1.1.1, as the DHCP server to the client.
3.
The WLC forwards the DHCP reply from the DHCP server to the wireless client with
its Virtual IP address.
its Virtual IP address.
Note: You can also configure the WLC to act as a DHCP server. For more
information on how to configure a WLC as a DHCP server, refer to the Configuring
DHCP Scopes section of the document Cisco Wireless LAN Controller Configuration
Guide Release 5.1.
information on how to configure a WLC as a DHCP server, refer to the Configuring
DHCP Scopes section of the document Cisco Wireless LAN Controller Configuration
Guide Release 5.1.
4.
Q. How do I change power and channels for a LAP?
A. Once a LAP registers to a WLC, all the configuration for a LAP is done on the WLC.
There is a built−in feature in WLC called RRM, wherein the WLC internally runs an
algorithm and automatically adjusts the channel and power settings as per the deployment of
LAPs. RRM is turned on by default on the WLC. You need not change the channel and power
settings for a LAP, but you can override the RRM feature and statically assign power and
channel settings for a LAP. For more information on how to manually configure the channel
and power settings, refer to the Statically Assigning Channel and Transmit Power Settings to
Access Point Radios section of the document Cisco Wireless LAN Controller Configuration
Guide, Release 5.1.
There is a built−in feature in WLC called RRM, wherein the WLC internally runs an
algorithm and automatically adjusts the channel and power settings as per the deployment of
LAPs. RRM is turned on by default on the WLC. You need not change the channel and power
settings for a LAP, but you can override the RRM feature and statically assign power and
channel settings for a LAP. For more information on how to manually configure the channel
and power settings, refer to the Statically Assigning Channel and Transmit Power Settings to
Access Point Radios section of the document Cisco Wireless LAN Controller Configuration
Guide, Release 5.1.
Q. I have multiple WLCs in my network. Is there any device or software
available to manage multiple WLCs in my network?
available to manage multiple WLCs in my network?
A. Yes, the Wireless Control System (WCS) is a server software that can manage multiple
WLCs on the network. It manages the WLCs, their associated access points, and clients. For
more information on the WCS, refer to Cisco Wireless Control System Configuration Guide,
Release 5.0.
WLCs on the network. It manages the WLCs, their associated access points, and clients. For
more information on the WCS, refer to Cisco Wireless Control System Configuration Guide,
Release 5.0.
Q. How do I edit the WLC configuration file?
A. When you save the WLC configuration, the controller stores it in XML format in flash
memory. In order to enable you to easily read and modify the configuration file, the controller
software (release 5.2 or later) converts it to a CLI format.
memory. In order to enable you to easily read and modify the configuration file, the controller
software (release 5.2 or later) converts it to a CLI format.
When you upload the configuration file to a TFTP or FTP server, the controller initiates the
conversion from XML to CLI. You can then read or edit the configuration file in the CLI
format on the server. When you are finished, you download the file back to the controller,
where it is converted to an XML format and saved.
conversion from XML to CLI. You can then read or edit the configuration file in the CLI
format on the server. When you are finished, you download the file back to the controller,
where it is converted to an XML format and saved.
For step−by−step instructions on how to edit the configuration file, refer to the Editing
Configuration Files section of the WLC Configuration Guide 6.0.
Configuration Files section of the WLC Configuration Guide 6.0.