Multicast Packet Suppression Is Not Configured, Causing Slow Network Access of STAs

Symptom

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 amount of abnormal multicast traffic is received on the network side, the air interfaces may be congested, and STAs may suffer from slow network access. 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 on WLAN-ESS interfaces of the AC.

Procedure

Configure multicast packet suppression in direct forwarding mode.

Create the traffic classifier test and define a matching rule.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] traffic classifier test
[SwitchA-classifier-test] if-match destination-mac 0100-5e00-0000 mac-address-mask ffff-ff00-0000   //Match the destination MAC address of multicast packets.
[SwitchA-classifier-test] quit

Create the traffic behavior test, enable traffic statistics collection, and set the traffic rate limit.

[SwitchA] traffic behavior test
[SwitchA-behavior-test] statistic enable
[SwitchA-behavior-test] car cir 100   //Set the rate limit to 100 kbit/s. If multicast services are available, you are advised to set the rate limit according to the service traffic.
[SwitchA-behavior-test] quit

Create the traffic policy test and bind the traffic classifier and traffic behavior to the traffic policy.

[SwitchA] traffic policy test
[SwitchA-trafficpolicy-test] classifier test behavior test
[SwitchA-trafficpolicy-test] quit

Apply the traffic policy to inbound or outbound directions of interfaces.

[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] traffic-policy test inbound
[SwitchA-GigabitEthernet0/0/1] traffic-policy test outbound
[SwitchA-GigabitEthernet0/0/1] quit

Configure multicast packet suppression in tunnel forwarding mode.

Create the traffic classifier test and define a matching rule.

<HUAWEI> system-view
[HUAWEI] sysname AC
[AC] traffic classifier test
[AC-classifier-test] if-match destination-mac 0100-5e00-0000 mac-address-mask ffff-ff00-0000   //Match the destination MAC address of multicast packets.
[AC-classifier-test] quit

Create the traffic behavior test, enable traffic statistics collection, and set the traffic rate limit.

[AC] traffic behavior test
[AC-behavior-test] statistic enable
[AC-behavior-test] car cir 100   //Set the rate limit to 100 kbit/s. If multicast services are available, you are advised to set the rate limit according to the service traffic.
[AC-behavior-test] quit

Create the traffic policy test and bind the traffic classifier and traffic behavior to the traffic policy.

[AC] traffic policy test
[AC-trafficpolicy-test] classifier test behavior test
[AC-trafficpolicy-test] quit

Apply the traffic policy to inbound or outbound directions of interfaces.

[AC] interface wlan-ess 1
[AC-Wlan-Ess1] traffic-policy test inbound
[AC-Wlan-Ess1] traffic-policy test outbound
[AC-Wlan-Ess1] quit