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How Do I Configure Multicast Packet Suppression to Reduce Impact of a Large Number of Low-Rate Multicast Packets on the Wireless Network?
No ACK mechanism is available for multicast packet transmission over unstable wireless links of air interfaces. For this reason, multicast packets are usually sent at low rates to ensure stable transmission. However, if a large number of multicast packets are sent from the network side, air interfaces may be congested. Therefore, you are advised to configure multicast packet suppression to reduce the impact of numerous low-rate multicast packets on the wireless network. Exercise caution when configuring the rate limit if there are multicast services on the network, as this may affect the multicast services.
- In direct forwarding mode, you are advised to configure multicast packet suppression on the interfaces of a switch connected to APs.
- In tunnel forwarding mode, you are advised to configure multicast packet suppression on WLAN-ESS interfaces of the AC in V200R005 and configure this function in traffic profiles of the AC in V200R006 and later versions.
Example for Configuring 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 //Configure a matching rule to 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 involved, you are advised to limit the rate based on 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 the inbound and outbound directions of the interface.
[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
Example for Configuring Multicast Suppression in Tunnel Forwarding Mode
In V200R005, the configuration procedure is as follows:
- Create the traffic classifier test and define a matching rule.
<AC> system-view [AC] traffic classifier test [AC-classifier-test] if-match destination-mac 0100-5e00-0000 mac-address-mask ffff-ff00-0000 //Configure a matching rule to 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 involved, you are advised to limit the rate based on 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 the WLAN-ESS interface on the AC.
[AC] interface wlan-ess 1 [AC-Wlan-Ess1] traffic-policy test inbound [AC-Wlan-Ess1] traffic-policy test outbound [AC-Wlan-Ess1] quit
In V200R006 and later versions, the configuration procedure is as follows:
- Create the traffic profile test and set the maximum traffic volume of multicast packets in the profile.
<AC> system-view [AC] wlan [AC-wlan-view] traffic-profile name test [AC-wlan-traffic-prof-test] traffic-optimize multicast-suppression packets 100 //Set the maximum traffic volume of multicast packets to 100 pps. If multicast services are involved, you are advised to set the value based on service traffic. [AC-wlan-traffic-prof-test] quit
- Bind the traffic profile to the VAP profile.
[AC-wlan-view] vap-profile name test [AC-wlan-vap-prof-test] traffic-profile test [AC-wlan-vap-prof-test] quit