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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 V200R005C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Example for Configuring IGMP Snooping

Example for Configuring IGMP Snooping

Networking Requirements

As shown in Figure 9-7, Router connects to user hosts through a Layer 2 Switch and Router runs IGMPv2. The multicast source (Source) sends data to multicast groups 225.1.1.1 to 225.1.1.5. There are three receivers HostA, HostB, and HostC on the network. The receivers are only allowed to receive data of groups 225.1.1.1 to 225.1.1.3.

Figure 9-7 Networking diagram for IGMP snooping configuration

Configuration Roadmap

To meet the preceding requirements, configure basic IGMP snooping functions and a multicast group policy on the Layer 2 Switch. The configuration roadmap is as follows:

  1. On the Switch, create a VLAN and add interfaces to the VLAN.
  2. Enable IGMP snooping globally and in the VLAN.
  3. Configure a multicast group policy and apply this policy to the VLAN.

Procedure

  1. Create a VLAN and add interfaces to the VLAN.

    <HUAWEI> system-view
    [~HUAWEI] sysname Switch
    [*HUAWEI] commit
    [~Switch] vlan 10
    [*Switch-vlan10] quit
    [*Switch] interface 10ge 1/0/1
    [*Switch-10GE1/0/1] port default vlan 10
    [*Switch-10GE1/0/1] quit
    [*Switch] interface 10ge 1/0/2
    [*Switch-10GE1/0/2] port default vlan 10
    [*Switch-10GE1/0/2] quit
    [*Switch] interface 10ge 1/0/3
    [*Switch-10GE1/0/3] port link-type trunk
    [*Switch-10GE1/0/3] port trunk allow-pass vlan 10
    [*Switch-10GE1/0/3] commit
    [~Switch-10GE1/0/3] quit

  2. Enable IGMP snooping.

    # Enable IGMP snooping globally.

    [~Switch] igmp snooping enable

    # Enable IGMP snooping in VLAN 10.

    [*Switch] vlan 10
    [*Switch-vlan10] igmp snooping enable
    [*Switch-vlan10] commit
    [~Switch-vlan10] quit

  3. Configure a multicast group policy and apply this policy.

    # Configure a multicast group policy.

    [~Switch] acl 2000
    [*Switch-acl4-basic-2000] rule deny source 225.1.1.4 0
    [*Switch-acl4-basic-2000] rule deny source 225.1.1.5 0
    [*Switch-acl4-basic-2000] commit
    [~Switch-acl4-basic-2000] quit

    # Apply the multicast group policy in VLAN 10.

    [~Switch] vlan 10
    [~Switch-vlan10] igmp snooping group-policy 2000
    [*Switch-vlan10] commit
    [~Switch-vlan10] quit

  4. Verify the configuration.

    # Check the member port information on the Switch.

    [~Switch] display igmp snooping port-info vlan 10 
     -------------------------------------------------------------------------------
      Flag: S:Static     D:Dynamic     M:Ssm-mapping                                
            A:Active     P:Protocol    T:Trill                               
                         (Source, Group)  Port                                  Flag
     -------------------------------------------------------------------------------
     VLAN 10, 5 Entry(s)                                                            
                          (*, 225.1.1.1)                                        PA- 
                                          10GE1/0/1                             -D- 
                                          10GE1/0/2                             -D- 
                                                            2 port(s) include       
                          (*, 225.1.1.2)                                        PA- 
                                          10GE1/0/1                             -D- 
                                          10GE1/0/2                             -D- 
                                                            2 port(s) include       
                          (*, 225.1.1.3)                                        PA- 
                                          10GE1/0/1                             -D- 
                                          10GE1/0/2                             -D- 
                                                            2 port(s) include       
                          (*, 225.1.1.4)                                        -A- 
                          (*, 225.1.1.5)                                        -A- 
     -------------------------------------------------------------------------------

    The command output shows that multicast groups 225.1.1.1 to 225.1.1.3 have dynamically generated member ports 10GE1/0/1 and 10GE1/0/2 on the Switch, whereas groups 225.1.1.4 and 225.1.1.5 have no member ports.

    # Check the router port information on the Switch.

    [~Switch] display igmp snooping router-port vlan 10 
     Port Name                            UpTime        Expires       Flags
     -------------------------------------------------------------------------- 
     VLAN 10, 1 router-port(s)
     10GE1/0/3                            12h03m12s     00h02m31s     DYNAMIC

    The command output shows that the router port is 10GE1/0/3.

    # Check the Layer 2 multicast forwarding table on the Switch.

    [~Switch] display multicast layer-2 ip fib vlan 10
    -------------------------------------------------------------------------------- 
    Forwarding Mode: IP 
    VLAN  Total                      (Source,Group)  Interface
    -------------------------------------------------------------------------------- 
    10     5
                                     (*, 225.1.1.1)  10GE1/0/1
                                                     10GE1/0/2
                                                     10GE1/0/3
                                     (*, 225.1.1.2)  10GE1/0/1 
                                                     10GE1/0/2
                                                     10GE1/0/3
                                     (*, 225.1.1.3)  10GE1/0/1 
                                                     10GE1/0/2
                                                     10GE1/0/3
                                     (*, 225.1.1.4)  10GE1/0/3
                                     (*, 225.1.1.5)  10GE1/0/3
    -------------------------------------------------------------------------------- 
    

    According to the preceding command output, only groups 225.1.1.1 to 225.1.1.3 have member ports in the multicast forwarding table, and multicast data of these groups can be forwarded to the hosts. Groups 225.1.1.4 and 225.1.1.5 have no member ports, and multicast data of the two groups is not forwarded to the host.

Configuration Files

  • Switch configuration file

    #
    sysname Switch
    #
    vlan batch 10
    #
    igmp snooping enable
    #
    vlan 10
     igmp snooping enable
     igmp snooping group-policy 2000
    #
    acl number 2000
     rule 5 deny source 225.1.1.4 0
     rule 10 deny source 225.1.1.5 0
    #
    interface 10GE1/0/1
     port default vlan 10
    #
    interface 10GE1/0/2
     port default vlan 10
    #
    interface 10GE1/0/3
     port link-type trunk
     port trunk allow-pass vlan 10
    #
    return
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Updated: 2019-04-20

Document ID: EDOC1100039595

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