Scenario-based Recommended Configurations

Traffic Optimization in Broadcast Domain Scenarios

In enterprise and campus scenarios, a single large subnet is usually designed. Designing a single large subnet simplifies VLAN configuration, roaming configuration, and fault location. However, a single large subnet uses a large broadcast domain. As a result, a large number of packets are replicated and sent, causing high CPU usage.

Converting broadcast packets to unicast packets, suppressing unknown unicast packets, and rate-limiting APs' multicast and broadcast packets can reduce the CPU usage, supporting large broadcast domain scenarios.

# Enable the function of sending mDNS unicast response packets. So that the AC functions as the mDNS gateway to respond to mDNS service request packets using unicast packets, reducing the packet duplication load on the AC. This function is disabled by default. You are advised to enable it.

<AC6805> system-view
[AC6805] mdns unicast-reply enable

# Enable the IGMP snooping function and the function of discarding unknown multicast flows in a VLAN. IGMP snooping runs on a Layer 2 device and analyzes IGMP messages exchanged between a Layer 3 device and hosts to set up and maintain a Layer 2 multicast forwarding table. The Layer 2 device forwards multicast packets based on the Layer 2 multicast forwarding table. This function is disabled by default. You are advised to enable it.

<AC6805> system-view
[AC6805] wlan
[AC6805-wlan-view] traffic-profile name default
[AC6805-wlan-traffic-prof-default] igmp-snooping enable
[AC6805-wlan-traffic-prof-default] quit
[AC6805-wlan-view] quit
[AC6805] vlan 10 
[AC6805-vlan10] multicast drop-unknown

# Enable the function of converting ARP, ND, and DHCP packets to unicast packets. This function is enabled by default. You are advised to retain the default setting.

<AC6805> system-view
[AC6805] wlan
[AC6805-wlan-view] traffic-profile name default
[AC6805-wlan-traffic-prof-default] traffic-optimize bcmc unicast-send arp nd dhcp

# Enable the function of suppressing ARP, ND, and DHCP packets. When air interface broadcast or multicast packets fail to be converted to unicast packets, these packets are discarded. This function is enabled by default. You are advised to retain the default setting.

<AC6805> system-view
[AC6805] wlan
[AC6805-wlan-view] traffic-profile name default
[AC6805-wlan-traffic-prof-default] traffic-optimize bcmc unicast-send mismatch-action drop

Traffic Optimization in VR Scenarios

When an AP is connected to a VR device, retransmission of lost packets has a great impact on user experience. Therefore, you can set the service guarantee mode to reliability first. That is, when the VR throughput requirement is met, the air interface rate can be lowered properly to reduce jitter and delay caused by packet loss and retransmission, improving user experience. It is recommended that the service guarantee mode be set to reliability-first in VR gaming scenarios and to performance-first in VR video scenarios.

# Set the service guarantee mode to reliability first. The default service guarantee mode is performance-first.

<AC6805> system-view 
[AC6805] wlan  
[AC6805-wlan-view] ssid-profile name ssid1 
[AC6805-wlan-ssid-prof-ssid1] service-guarantee reliability-first