How Do I Configure Multicast Packet Suppression to Reduce Impact of a Large Number of Low-Rate Multicast Packets on the Wireless Network?

Latest reply: Sep 29, 2018 06:37:21 347 3 9 0
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 on WLAN-ESS interfaces of the AC in V200R8C00 and earlier versions and in traffic profiles of the AC in versions later than V200R008C00.

Example for Configuring Multicast Packet Suppression In Direct Forwarding Mode

  1. 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
    
  2. 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
    
  3. 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
    
  4. 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
    

Example for Configuring Multicast Suppression in Tunnel Forwarding Mode

In V200R8C00 and earlier versions, the configuration procedure is as follows:

  1. 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
    
  2. 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
    
  3. 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
    
  4. 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
    

In versions later than V200R008C00, the configuration procedure is as follows:

  1. Create the traffic profile test and set the maximum traffic volume of multicast packets in the profile.

    <HUAWEI> system-view
    [HUAWEI] sysname AC
    [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 available, you are advised to set the rate limit according to the service traffic.
    [AC-wlan-traffic-prof-test] quit
    
  2. 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
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Sergio93
Created Sep 14, 2018 14:47:37 Helpful(0) Helpful(0)

It's useful but I suggest to use ACLs to classify the packets, not just MAC addresses:) Thanks for sharing it.
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No.9527
Created Sep 29, 2018 05:51:54 Helpful(0) Helpful(0)

I am very interested for this post, which is very helpful to our daily troubleshooting. I always have similar problems in my daily work, but I do not know how to deal with them. Now I have a clear idea. Thank you very much for your sharing. Hope you can update continue like this
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SupperRobin
Created Sep 29, 2018 06:37:21 Helpful(0) Helpful(0)

Thanks for you share about this which is very useful for my daily work.
And now i can easy to check the CPCAR ISSUE if i face any issue about this.before this i aways do not know how to deal with them,and wasted a lot of time to serch this.Thanks agin for you selfless Sharing, Hope you can aways work like this.:):):)
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