安装pimd

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apt install pimd

拓扑

TOPO

配置ospf

参考《linux网络1_ospf》分别对routeA和routeB进行ospf功能配置，或者设置默认路由，使得组播源、接收端1、接收端2这三者之间能两两相互ping通

搭建组播源与接收端

参考《vlc组播测试Server及Client使用》

配置RouterA

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# root @ routerA in / [14:27:40]
$ grep -v "^#" /etc/pimd.conf
phyint eth2 disable #重要：关掉不参与组播功能的端口，免得影响组播
phyint eth3 disable #重要：关掉不参与组播功能的端口，免得影响组播
phyint eth4 disable #重要：关掉不参与组播功能的端口，免得影响组播
bsr-candidate priority 5
rp-candidate time 30 priority 20 #动态选举汇聚点RP路由器(也可设置为静态RP,但所有路由必须设置同一个)
spt-threshold packets 0 interval 100

# root @ routerA in / [14:27:47]
$ systemctl restart pimd.service

配置RouterB

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# root @ routerB in / [14:33:40]
$ grep -v "^#" /etc/pimd.conf
phyint eth2 disable #重要：关掉不参与组播功能的端口，免得影响组播
phyint eth3 disable #重要：关掉不参与组播功能的端口，免得影响组播
phyint eth4 disable #重要：关掉不参与组播功能的端口，免得影响组播
bsr-candidate priority 5
rp-candidate time 30 priority 20 #动态选举汇聚点RP路由器(也可设置为静态RP,但所有路由必须设置同一个)
spt-threshold packets 0 interval 100

# root @ routerB in / [14:33:47]
$ systemctl restart pimd.service

调试

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$ journalctl -u pimd.service
...

查看结果

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# root @ routerA in / [15:04:54]
$ ip mroute show to 239.255.255.249
(10.2.1.2, 239.255.255.249)      Iif: eth0       Oifs: eth1

# root @ routerA in / [15:05:01]
$ pimd --show-routes
Virtual Interface Table ======================================================
Vif  Local Address    Subnet              Thresh  Flags      Neighbors
---  ---------------  ------------------  ------  ---------  -----------------
  0  10.2.1.1         10.2.1/24                1  DR NO-NBR
  1  30.1.1.2         30.1.1/24                1  DR PIM     30.1.1.1
  2  192.168.255.1    192.168.255              1  DISABLED
  3  10.2.1.1         register_vif0            1

 Vif  SSM Group        Sources

Multicast Routing Table ======================================================
----------------------------------- (*,G) ------------------------------------
Source           Group            RP Address       Flags
---------------  ---------------  ---------------  ---------------------------
INADDR_ANY       239.255.255.249  30.1.1.2         WC RP
Joined   oifs: ....
Pruned   oifs: ....
Leaves   oifs: .l..
Asserted oifs: ....
Outgoing oifs: .o..
Incoming     : ...I

TIMERS:  Entry    JP    RS  Assert VIFS:  0  1  2  3
             0    45     0       0        0  0  0  0
----------------------------------- (S,G) ------------------------------------
Source           Group            RP Address       Flags
---------------  ---------------  ---------------  ---------------------------
10.2.1.2         239.255.255.249  30.1.1.2         SPT CACHE SG
Joined   oifs: ....
Pruned   oifs: ....
Leaves   oifs: .l..
Asserted oifs: ....
Outgoing oifs: .o..
Incoming     : I...

TIMERS:  Entry    JP    RS  Assert VIFS:  0  1  2  3
           175    30     0       0        0  0  0  0
...

routerA的组播路由表出现了 (10.2.1.2, 239.255.255.249) Iif: eth0 Oifs: eth1

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# root @ routerB in / [15:08:16]
$ ip mroute show to 239.255.255.249
(30.1.1.2, 239.255.255.249)      Iif: eth1       Oifs: eth0

# root @ routerB in / [15:10:21]
$ pimd --show-routes
Virtual Interface Table ======================================================
Vif  Local Address    Subnet              Thresh  Flags      Neighbors
---  ---------------  ------------------  ------  ---------  -----------------
  0  10.1.1.1         10.1.1/24                1  DR NO-NBR
  1  30.1.1.1         30.1.1/24                1  PIM        30.1.1.2
  2  192.168.20.1     192.168.20               1  DISABLED
  3  192.168.30.1     192.168.30               1  DISABLED
  4  10.1.1.1         register_vif0            1

 Vif  SSM Group        Sources

Multicast Routing Table ======================================================
----------------------------------- (*,G) ------------------------------------
Source           Group            RP Address       Flags
---------------  ---------------  ---------------  ---------------------------
INADDR_ANY       239.255.255.249  30.1.1.2         WC RP
Joined   oifs: .....
Pruned   oifs: .....
Leaves   oifs: l....
Asserted oifs: .....
Outgoing oifs: o....
Incoming     : .I...

TIMERS:  Entry    JP    RS  Assert VIFS:  0  1  2  3  4
             0    40     0       0        0  0  0  0  0
----------------------------------- (S,G) ------------------------------------
Source           Group            RP Address       Flags
---------------  ---------------  ---------------  ---------------------------
30.1.1.2         239.255.255.249  30.1.1.2         SPT CACHE SG
Joined   oifs: .....
Pruned   oifs: .....
Leaves   oifs: l....
Asserted oifs: .....
Outgoing oifs: o....
Incoming     : .I...

TIMERS:  Entry    JP    RS  Assert VIFS:  0  1  2  3  4
           190    45     0       0        0  0  0  0  0

routerB的组播路由表出现了 (30.1.1.2, 239.255.255.249) Iif: eth1 Oifs: eth0

备注：可以看到routerA和routerB的汇聚点选举结果为 RP Address:30.1.1.2

测试组播通路

接收端1和接收端2上面的vlc都能播放udp://@239.255.255.249:1249的视频。