Example for Configuring Dynamic Load Balancing
Service Requirements
Enterprise users can access the network through WLANs, which is the basic requirement of mobile office. The enterprises also need to prevent one AP radio from being heavily loaded. Furthermore, users' services are not affected during roaming in the coverage area.
As shown in Figure 5-58, before load balancing is configured, 30 users are connected to AP area_1, and 10 users are connected to AP area_2.
Networking Requirements
- AP area_1 and AP area_2 are managed by the same AC.
- STAs can detect SSIDs of both the APs.
Data Planning
Item |
Data |
|---|---|
RRM profile |
|
2G radio profile |
|
5G radio profile |
|
Configuration Notes
Currently, the load balancing function is implemented in the STA access phase. In scenarios with complex user service types and unstable traffic, the expected load balancing effect cannot be achieved. In this case, you are not advised to enable load balancing based on the channel usage.
- 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.
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
- Check the basic configuration of the WLAN.
- Choose , and confirm that the AP group ap-group1 already exists.
- Click ap-group1. Choose , confirm that the VAP profile wlan-net already exists, and check all referenced profiles.
- Configure dynamic load balancing.
- In the RRM profile, enable dynamic load balancing, and set the start threshold for dynamic load balancing to 15 and load difference threshold to 25%.
# Choose . Click Create. The Create RRM Profile page that is displayed
# Enter the profile name wlan-net and click OK. The RRM Profile page is displayed.
# On the Advanced Configuration tab, enable dynamic load balancing, and set the start threshold for dynamic load balancing to 15 and load difference threshold to 25%.
# Click Apply. In the dialog box that is displayed, click OK.
# Choose . The RRM Profile page is displayed. Configure dynamic load balancing for radio 1. The configuration is similar to that of radio 0 and is not mentioned here.
- In the RRM profile, enable dynamic load balancing, and set the start threshold for dynamic load balancing to 15 and load difference threshold to 25%.
- Verify the configuration.
- Choose . The number of STAs on different APs is displayed under User Statistics List by AP.
- When a new STA requests to connect to AP area_1, the AC uses a dynamic load balancing algorithm to redirect the STA to the AP area_2 with a light load according to the information reported by APs.
