「Network」- 组播，Multicast，常见问题处理

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配置命令（Huawei）

常用命令

<Huawei> display pim interface
<Huawei> display pim neighbor

// 查看更多详细信息
<Huawei> display pim fsm

简单实验（PIM-Dense Mode）

配置： 

// 路由器的互联接口
[Huawei] multicast routing-enable
[Interface] pim dm

// 在接收端的路由器
[Huawei] multicast routing-enable
[Interface] pim dm
[Interface] igmp enable # igmp static-group 239.1.1.1

// 注意事项
// 1）设备设备都要正确配置，否则组播流量是不会下发的。比如，如果没有终端加入组播组，则组播流量不会下发。
// 2）在下游接口中，如果单纯开启 IGMP 而没有开启 pim dm 指令，那生成的 PIM 路由将无法学习到下游接口，则无法下发流量；

查看： 

// 查看路由表 以及 RPF 信息

<AR1>display multicast routing-table
(Empty)

<AR1>display pim routing-table
(Empty)

<AR1>display multicast rpf-info 192.168.1.2
 VPN-Instance: public net
 RPF information about source: 192.168.1.2
     RPF interface: GigabitEthernet0/0/0
     Referenced route/mask: 192.168.1.0/24
     Referenced route type: unicast
     Route selection rule: preference-preferred
     Load splitting rule: disable
...

通过 eNSP 支持的 VLC 来播放视频，并在接收端查看视频……

查看： 

<AR1>display multicast routing-table 
Multicast routing table of VPN-Instance: public net 
 Total 1 entry

 00001. (192.168.1.2, 239.2.2.2)
       Uptime: 00:00:16
       Upstream Interface: GigabitEthernet0/0/0
       List of 1 downstream interface
           1:  GigabitEthernet0/0/2

<AR1>display pim routing-table 
 VPN-Instance: public net
 Total 0 (*, G) entry; 1 (S, G) entry

 (192.168.1.2, 239.2.2.2)
     Protocol: pim-dm, Flag: LOC ACT 
     UpTime: 00:00:37
     Upstream interface: GigabitEthernet0/0/0
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/0/2
             Protocol: pim-dm, UpTime: 00:00:37, Expires: never

<AR1>display multicast rpf-info 192.168.1.2
 VPN-Instance: public net
 RPF information about source: 192.168.1.2
     RPF interface: GigabitEthernet0/0/0
     Referenced route/mask: 192.168.1.0/24
     Referenced route type: unicast
     Route selection rule: preference-preferred
     Load splitting rule: disable