What is the function of a WLAN AC source or CAPWAP source

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As a network element, an AC must be configured with an IP address for communication with other devices. The WLAN AC Source or CAPWAP Source parameter is used to assign an IP address to the AC. Generally, the IP address of the loopback interface or VLANIF interface serves as the AC source.

In versions earlier than V200R005C00, WLAN AC Source is used. In V200R005C00 and later versions, WLAN AC Source is changed to CAPWAP Source.

Other related questions:
Source interface of the AC
Source interface of the AC
An AC uses the IP address of the specified interface as the source IP address in WLAN scenarios. All APs connected to the AC can learn this source IP address and use the IP address to communicate with the AC.

-Create the IP address of the corresponding interface in advance. VLANIF 1 is not recommended because VLAN 1 is the management VLAN;
-Use the VRRP virtual IP or loopback IP address;
-Use the interface or IP address;
-The AC supports only one source interface. To modify the source interface configuration, run the undo wlan ac source {interface|ip address} or undo capwap source {interface|ip address} command to delete the existing configuration first;
-Note that all APs will be disconnected when the source interface configuration is deleted.

Configuration example of V200R003:
[HUAWEI]wlan
[HUAWEI-WLAN-view]wlan ac source interface loopback 1 
[HUAWEI-WLAN-view]wlan ac source interface vlanif 10
[HUAWEI-WLAN-view]wlan ac source ip address 192.168.1.1
Check the configuration.
Run the display wlan ac source interface command to view the source interface of the AC;
Run the display wlan ac source ip-address command to view the source IP address of the AC.

From V200R005C10, commands are changed and the view is changed to the system view: 
[HUAWEI]capwap source interface vlanif 10
[HUAWEI]capwap source interface loopback 1
[HUAWEI]capwap source ip address 192.168.1.1
Check the configuration.
Run the display capwap configuration command to check the source interface or source address of an AC.

Function of the source-in and source-out on USG firewalls
When forwarding a response packet, the firewall directly uses the inbound interface as the outbound interface of the response packet instead of looking for the outbound interface in the routing table. In this way, packets can be received and sent over the same interface.

Interference sources on WLAN networks
Two frequency bands are available in WLAN: 2.4 GHz and 5 GHz. The 2.4 GHz frequency band is the industrial, scientific, and medical (ISM) band and is open to cordless phones, baby monitors, microwave ovens, wireless cameras, Bluetooth devices, infrared sensors, and fluorescent light ballasts. These devices are all interference sources. Compared with the 2.4 GHz frequency band, the 5 GHz frequency band has fewer interference sources. However, more devices begin to use the 5 GHz frequency band, such as cordless phones, radars, wireless sensors, and digital satellites. In most cases, microwave ovens work at frequency bands ranging from 2.4 GHz to 2.5 GHz, which overlap the 2.4 GHz frequency band used by WLAN devices. In addition, the power of microwave ovens ranges between 800 W and 2000 W, which is much higher than the transmit power of APs and STAs. Even though interference shielding is performed, microwave ovens still have severe interference on WLAN devices. Microwave ovens greatly reduce the throughput of WLAN devices if they are within a distance shorter than 8 meters from WLAN devices. The power of cordless phones is about 3 W, which is higher than APs' transmit power. According to the test analysis on the interference caused by cordless phones on WLAN devices, when the distance between cordless phones and APs (or STAs) is within 1 meter, interference increases significantly. When the distance is shorter than 0.5 meters, WLAN devices may go offline and the cordless phone voice is not clear. Therefore, you are advised to use cordless phones more than 2 meters away from APs or STAs. The transmit power of wireless cameras ranges from 500 mW to 1000 mW. In indoor scenarios, wireless cameras may affect the WLAN network but have lighter interference than microwave ovens and cordless phones. Therefore, you are advised to deploy APs far away from wireless cameras during WLAN planning. Bluetooth devices adopt frequency hopping spread spectrum technology, and each Bluetooth channel has a bandwidth of 1 MHz If a Bluetooth device is sending data at the frequency band overlapping with a WLAN channel that is being monitored by a WLAN device, the WLAN device selects a random backoff period. During this period, the Bluetooth device changes to work at a non-overlapping channel, allowing the WLAN device to send data. Therefore, Bluetooth devices have small interference on WLAN devices. This interference can be ignored during WLAN planning.

Where are interference sources on a WLAN and how is the interference strength
Two frequency bands are available on WLANs: 2.4 GHz and 5 GHz. The 2.4 GHz frequency band is the Industrial, Scientific, and Medical (ISM) open frequency band. Interference sources in the 2.4 GHz frequency band include cordless phones, baby monitors, microwave ovens, wireless cameras, bluetooth devices, infrared sensors, and fluorescent light ballasts. Compared with 2.4 GHz frequency band, 5 GHz frequency band has fewer interference sources and more devices begin to use the 5 GHz frequency band, such as cordless phones, radars, wireless sensors, and digital satellites. In most cases, microwave ovens work at the frequency band ranging from 2.4 to 2.5 GHz, which overlaps the 2.4 GHz frequency band used by WLAN devices. In addition, the power of microwave ovens ranges between 800 W and 2000 W, which is much higher than the transmit power of APs and STAs. Even though interference shielding is performed, microwave ovens still have severe interference on WLAN devices. Microwave ovens greatly reduce the throughput of WLAN devices if they are within a distance shorter than 8 meters around WLAN devices. The power of cordless phones is about 3 W, which is higher than the AP's transmit power. According to the test analysis on the interference caused by cordless phones on WLAN devices, when the distance between cordless phones and APs (or STAs) is within 1 meter, interference increases significantly. When the distance is shorter than 0.5 meter, WLAN devices are even offline and the cordless phone voice is not clear. Therefore, you are advised to deploy cordless phones more than 2 meters away from APs or STAs. The transmit power of wireless cameras ranges from 500 mW to 1000 mW. In indoor scenarios, wireless cameras may affect the WLAN network but have lighter interference than microwave ovens and cordless phones. Therefore, you are advised to deploy wireless cameras far away from WLAN devices during WLAN planning. Bluetooth devices use the frequency hopping spread spectrum (FHSS) technology and 1 MHz channel bandwidth. If a bluetooth device is sending data at the frequency band overlapping with a WLAN channel that is being monitored by a WLAN device, the WLAN device selects a random backoff period. During this period, the bluetooth device changes to work at a non-overlapping channel, allowing the WLAN device to send data. Therefore, bluetooth devices have small interference on WLAN devices. This interference can be ignored during WLAN planning.

Functions of the multicast-source-deny command on an S series switch
For S series switches excluding the S1700, the multicast-source-deny command filters out multicast data packets in a VLAN on a Layer 2 interface. After this command is executed on a Layer 2 interface, multicast data packets received from the specified VLAN are dropped on the interface. By default, an interface is disabled from filtering out multicast data packets sent from specified VLANs. This command can filter out only multicast data packets transmitted over UDP. Multicast data packets received from the specified VLAN are not dropped on the interface if they do not contain the UDP protocol field.

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