[Knowledge sharingWireless Configuration Synchronization Overview

Hello everyone,

Starting from V200R007C20, Huawei Access Controllers support a new useful function which indicates that configurations are automatically synchronized between two ACs. In each network it's recommended to have reliability so we use 2 ACs.

VRRP HSB or dual-link HSB is often deployed on ACs to improve network reliability. HSB requires consistent WLAN service configurations on the master AC and backup master AC. In real-world scenarios, there may be hundreds or thousands of lines of WLAN service configurations, leading to a heavy configuration workload.

Wireless configuration synchronization allows configuring WLAN services on only one of the two ACs, ensures that these configurations are automatically synchronized to the other AC, and so greatly reduces the configuration workload. In addition, this function facilitates configuration maintenance because all configurations are synchronized between the two ACs.

Configurations that can be automatically synchronized are public configurations, while those that cannot be automatically synchronized are private configurations.

Common public configurations include:
- Configurations of roaming and wireless services including radio, SSID, WLAN security, radio resource management, and positioning
- Configurations of NAC and AAA, including MAC authentication, 802.1x authentication, external Portal authentication, AAA authentication, RADIUS authentication, and TACACS authentication, excluding access user configuration and built-in Portal configuration used for local authentication
- Configurations required by wireless services, including VLAN pool, time-range, ACL, free-rule, QoS, and passthrough-domain
- URL filtering, signature database upgrade, intrusion prevention, antivirus, and Smart Application Control (SAC) configurations
Common private configurations include:
- VLAN, interface, IP address, routing, DHCP, DNS, and IPSec configurations
- Wired configurations including basic configuration, device management, interface management, network interconnection, and network management configurations
- Wireless configuration synchronization, CAPWAP, backup, and AP online parameter configurations
- Access user configuration and built-in Portal authentication used for local authentication
- AP upgrade configurations, including the upgrade file, mode, and task, FTP server, SFTP server, and maximum number of APs that can be concurrently upgraded.
Procedure to configure Wireless Configuration Synchronization in VRRP HSB Scenarios:

Configure the master AC and backup master AC. The local and peer IP addresses configured on the master AC are the peer and local IP addresses configured on the backup master AC, respectively.
1. Run the system-view command to enter the system view.
2. Run the wlan command to enter the WLAN view.
3. Run:
```
master controller
```
  The master controller view is displayed.
4. Run:
```
master-redundancy peer-ip ip-address ipv4-address1 local-ip ip-address ipv4-address2 psk psk
```
  The local and peer IP addresses of the AC are set.
  By default, no local or peer IP address is configured for the AC.
  The psk values configured on the master AC and backup master AC must be the same.
5. Run:
```
master-redundancy track-vrrp vrid vrid interface interface-type interface-number
```
  VRRP is enabled to track the status of an interface to negotiate the master AC and backup master AC roles.
  By default, VRRP is disabled from tracking the status of an interface to negotiate the master AC and backup master AC roles.
Manually trigger wireless configuration synchronization on the master AC.
1. Run the system-view command to enter the system view.
2. Run:
```
synchronize-configuration
```
  Wireless configuration synchronization is triggered.

Procedure to configure Wireless Configuration Synchronization in dual-link HSB scenarios

To implement wireless configuration synchronization in dual-link HSB scenarios, you need to manually specify the master AC and local AC and specify each other's IP address on the two ACs. In this manner, the master AC and local AC can be identified correctly to establish a CAPWAP tunnel, over which wireless configuration synchronization data is transmitted between the two ACs.

After the master AC and local AC are configured, manually enable wireless configuration synchronization to ensure consistent public configurations on the two ACs. Any subsequent public configurations on the master AC will be automatically synchronized to the local AC.

NOTE:

The psk values configured on the master AC and local AC must be the same so that inter-AC CAPWAP tunnel can be properly established.

Each master AC can only have the unique IP address specified for the local AC, and each local AC can only have the unique IP address specified for the master AC. The configured IP address cannot be the IP address of the master or local AC.

Configure wireless configuration synchronization on the master AC.
1. Run the system-view command to enter the system view.
2. Run the wlan command to enter the WLAN view.
3. Run:
```
master controller
```
  The master controller view is displayed.
4. Run:
```
local-controller ip-address ipv4-address psk psk
```
  An IP address is specified for a local AC.
  By default, no IP address is set for a local AC on a master AC.
Configure wireless configuration synchronization on a local AC.
1. Run the system-view command to enter the system view.
2. Run the wlan command to enter the WLAN view.
3. Run:
```
master-controller ip-address ipv4-address psk psk
```
  The current AC is configured as a local AC and an IP address is set for the master AC.
  By default, the current AC is the master AC and no IP address is set for it.
Manually trigger wireless configuration synchronization on the master AC.
1. Run the system-view command to enter the system view.
2. Run:
```
synchronize-configuration
```
  Wireless configuration synchronization is triggered.