Example for Configuring Service Holding upon WLAN CAPWAP Link Disconnection

Wireless Access Controller (AC and Fit AP) V200R019C10 Web-based Configuration Guide

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Service Requirements

Enterprise users can access the network through WLANs, which is the basic requirement of mobile office. Furthermore, users' services are not affected during roaming in the coverage area.

The enterprise requires that data forwarding be not affected even when the AC is faulty to improve data transmission reliability.

Networking Requirements

AC networking mode: Layer 2 bypass mode
DHCP deployment mode: Switch functions as a DHCP server to assign IP addresses to APs and STAs.
Service data forwarding mode: direct forwarding

Figure 3-81 Networking for configuring service holding upon WLAN CAPWAP link disconnection

Data Planning

Table 3-81 AC data planning

Item	Data
Management VLAN for APs	VLAN 100
Service VLAN for STAs	VLAN 101
DHCP server	Switch functions as a DHCP server to assign IP addresses to APs and STAs.
IP address pool for APs	10.1.1.3-10.1.1.254/24
IP address pool for STAs	10.1.2.3-10.1.2.254/24
Gateway address for APs	10.1.1.1/24
Gateway address for STAs	10.1.2.1/24
AC source interface	VLANIF 100: 10.1.1.2/24
AP group	Name: ap-group1 Referenced profiles: AP system profile ap-system, VAP profile wlan-net, and regulatory domain profile default
Regulatory domain profile	Name: default Country code: China
SSID profile	Name: wlan-net SSID name: wlan-net
Security profile	Name: wlan-net Security policy: WPA-WPA2+PSK+AES Password: a1234567
VAP profile	Name: wlan-net Forwarding mode: direct forwarding Service VLAN: VLAN 101 Referenced profiles: SSID profile wlan-net and security profile wlan-net
AP system profile	Name: ap-system Service holding upon CAPWAP link disconnection: enabled

Configuration Roadmap

Configure network interworking of the AC, APs, and other network devices.
Select Config Wizard to configure system parameters for the AC.
Select Config Wizard to configure the APs to go online on the AC.
Select Config Wizard to configure WLAN services on the AC.
Configure service holding upon CAPWAP link disconnection to improve data transmission reliability so that data forwarding is not affected even when the AC is faulty.
Deliver the WLAN services to the APs and verify the configuration.

Configuration Notes

No ACK mechanism is provided for multicast packet transmission on air interfaces. In addition, wireless links are unstable. To ensure stable transmission of multicast packets, they are usually sent at low rates. If a large number of such multicast packets are sent from the network side, the air interfaces may be congested. You are advised to configure multicast packet suppression to reduce impact of a large number of low-rate multicast packets on the wireless network. Exercise caution when configuring the rate limit; otherwise, the multicast services may be affected.
- In direct forwarding mode, you are advised to configure multicast packet suppression on switch interfaces connected to APs.
- In tunnel forwarding mode, you are advised to configure multicast packet suppression in traffic profiles of the AC.
For details on how to configure traffic suppression, see How Do I Configure Multicast Packet Suppression to Reduce Impact of a Large Number of Low-Rate Multicast Packets on the Wireless Network?.
Configure port isolation on the interfaces of the device directly connected to APs. If port isolation is not configured and direct forwarding is used, a large number of unnecessary broadcast packets may be generated in the VLAN, blocking the network and degrading user experience.
In tunnel forwarding mode, the management VLAN and service VLAN cannot be the same. Only packets from the management VLAN are transmitted between the AC and APs. Packets from the service VLAN are not allowed between the AC and APs.

Procedure

Configure the network devices.

# Create VLAN 100 (management VLAN) and VLAN 101 (service VLAN) on the switch. Set the link type of GE0/0/1 that connects the switch to the APs to trunk and PVID of the interface to 100, and configure the interface to allow packets of VLAN 100 and VLAN 101 to pass. Set the link type of GE0/0/2 on the switch to trunk, and configure the interface to allow packets of VLAN 100 to pass.

<HUAWEI> system-view
[HUAWEI] sysname Switch
[Switch] vlan batch 100 101
[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] port link-type trunk
[Switch-GigabitEthernet0/0/1] port trunk pvid vlan 100
[Switch-GigabitEthernet0/0/1] port trunk allow-pass vlan 100 to 101
[Switch-GigabitEthernet0/0/1] port-isolate enable
[Switch-GigabitEthernet0/0/1] quit
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] port link-type trunk
[Switch-GigabitEthernet0/0/2] port trunk allow-pass vlan 100
[Switch-GigabitEthernet0/0/2] quit

# Add GE1/0/0 on Router to VLAN 101. Create VLANIF 101 and set its IP address to 10.1.2.2/24.

<Huawei> system-view
[Huawei] sysname Router
[Router] vlan batch 101
[Router] interface gigabitethernet 1/0/0
[Router-GigabitEthernet1/0/0] port link-type trunk
[Router-GigabitEthernet1/0/0] port trunk allow-pass vlan 101
[Router-GigabitEthernet1/0/0] quit
[Router] interface vlanif 101
[Router-Vlanif101] ip address 10.1.2.2 24
[Router-Vlanif101] quit

Configure the DHCP servers to assign IP addresses to APs and STAs.
Configure the DNS server as required. The common methods are as follows:
- In interface address pool scenarios, run the dhcp server dns-list ip-address &<1-8> command in the VLANIF interface view.
- In global address pool scenarios, run the dns-list ip-address &<1-8> command in the IP address pool view.
# Configure VLANIF 100 to use the interface address pool to allocate IP addresses to APs.
```
[Switch] dhcp enable
[Switch] interface vlanif 100
[Switch-Vlanif100] ip address 10.1.1.1 255.255.255.0
[Switch-Vlanif100] dhcp select interface
[Switch-Vlanif100] quit
```
# Configure VLANIF 101 to use the interface address pool to allocate IP addresses to STAs.
```
[Switch] interface vlanif 101
[Switch-Vlanif101] ip address 10.1.2.1 255.255.255.0
[Switch-Vlanif101] dhcp select interface
[Switch-Vlanif101] quit
```
Configure system parameters for the AC.
1. Perform basic AC configurations.
  # Choose Configuration > Config Wizard > AC. The Basic AC Configuration page is displayed.
  
  # Set Country/Region based on actual situations. For example, set Country/Region to China. Set System time to Manual and Date and time to PC.
  
  # Click Next. The Port Configuration page is displayed.
2. Configure interfaces.
  # Select GigabitEthernet0/0/1 and expand Batch Modify. Set Interface type to Trunk and add GigabitEthernet0/0/1 to VLAN 100 (management VLAN).
  
  If the AC and APs are directly connected, set the default VLAN of the interfaces connected to the APs to management VLAN 100.
  
  # Click Apply. In the dialog box that is displayed, click OK.
  
  # Click Next. The Network Interconnection Configuration page is displayed.
3. Configuring network interconnections.
  # Click Create under Interface Configuration. The Create Interface Configuration page is displayed.
  
  # Set the IP address of VLANIF 100 to 10.1.1.2/24.
  
  # Click OK. An address pool for VLANIF 100 is configured.
  
  # Click Next.
  
  # Click Next. The AC Source Address page is displayed.
4. Configure the source address for AC.
  # Set AC source address to VLANIF. Click the browse button and select Vlanif100.
  
  # Click Next. The Confirm Settings page is displayed.
5. Confirm the configuration.
  # Confirm the configuration and click Continue With AP Online.
Configure APs to go online.
1. Configure APs to go online.
  # Click Batch Import. The Batch Import page is displayed. Click to download an AP template file to your local computer.
  # Fill in the AP template file with AP information according to the following example. To add multiple APs, fill in the file with information of the APs.
  - AP MAC: 60de-4476-e360
  - AP SN: 210235419610CB002287
  - AP Name: area_1
  - AP Group: ap-group1
  If you set AP authentication mode to MAC address authentication, the AP's MAC address is mandatory and the AP's SN is optional.
  If you set AP authentication mode to SN authentication, the AP's SN is mandatory and the AP's MAC address is optional.
  
  You are advised to export the radio ID, AP channel, frequency bandwidth, and power planned on WLAN Planner to a .csv file, and then enter them in the AP template file. Set the longitude and latitude as required.
  # Click next to Import AP File, select the AP template file, and click Import.
  
  # On the page that displays the template import result, click OK.
  
  # Click Next. The Group APs page is displayed.
  
  # AP group information has been added in the AP template file. Click Next. The Confirm Configurations page is displayed.
2. Confirm the configuration.
  # Confirm the configuration and click Continue With Wireless Service Configuration.
Configure WLAN services.
# Click Create. The Basic Information page is displayed.

# Set the SSID name, forwarding mode, and service VLAN.

# Click Next. The Security Authentication page is displayed.

# Set Security settings to Key (applicable to personnel networks) and set the key.

# Click Next. The Access Control page is displayed.

# Set Binding the AP group to ap-group1.

# Click Finish.
Create an AP system profile and configure service holding upon link disconnection.
# Choose Configuration > AP Config > AP Group. The AP Group page is displayed.

# Click AP group ap-group1. The AP group configuration page is displayed.

# Choose AP > AP System Profile. The AP System Profile page is displayed.

# Click Create. On the Create AP System Profile page that is displayed, enter the profile name ap-system and click OK. The AP system profile configuration page is displayed.

# Set Policy for service holding upon link disconnection to Holding and prohibiting new user access.

# Click Apply. In the dialog box that is displayed, click OK.
Set the AP channel and power.
1. Disable automatic channel and power calibration functions of AP radios, and manually configure the AP channel and power.
  
  Automatic channel and power calibration functions are enabled by default. The manual channel and power configurations take effect only when these two functions are disabled.
  
  # Choose Configuration > AP Config > AP Config > AP Info. The AP List page is displayed.
  
  # Click the ID of the AP whose channel and power need to be configured. The AP customized settings page is displayed.
  
  # Click next to Radio Management. The profiles under Radio Management are displayed.
  
  # Click Radio 0. On the radio 0 configuration page that is displayed, disable the automatic channel and power calibration functions, and set the channel to 20-MHz channel 6 and transmit power to 127 dBm.
  
  # The configuration of Radio 1 is similar to that of Radio0. Disable automatic channel and power calibration functions, and set the AP channel to 20-MHz channel 149 and transmit power to 127 dBm.
  
  # Click Apply. In the dialog box that is displayed, click OK.
Verify the configuration.
The WLAN with the SSID wlan-net is available, and STAs can access the WLAN normally. When the CAPWAP link is disconnected due to an AC fault, service data forwarding of STAs in Area A is not affected.