注意事项
在配置过程中，请注意以下几点：
l 如果没有配置SSM的组地址，默认为232.0.0.0～232.255.255.255；
l 必须使用IGMPv3指定源加入
l 目前不支持以exclude模式加入组。
组网需求
RouterA、RouterB和RouterC组成一个PIM-SM的组播网络，其中RouterA连接组播源，RouterB和RouterC连接不同的接收者，接收者指定源加入。通过配置改变SSM组地址范围。如组网图所示：
配置思路
l
RouterA、RouterB和RouterC上分别配置单播路由协议，使各设备和组播源、接收
者之间路由可达
l
RouterA、RouterB和RouterC上分别使能组播路由协议，并配置各接口的PIM-SM
协议，连接接收者的接口配置IGMPv3协议
l
配置SSM组地址范围
1、配置步骤
＃全局启动组播路由
[RouterA]multicast
routing-enable
＃配置连接组播源的接口地址，并且启用PIM-SM协议
[RouterA]interface
gigabitethernet3/1/1
[RouterA-GigabitEthernet3/1/1]ip
address 10.10.1.1 24
[RouterA-GigabitEthernet3/1/1]pim
sm
＃配置连接RouterB的接口地址，并且启用PIM-SM协议
[RouterA]interface
gigabitethernet3/1/3
[RouterA-GigabitEthernet3/1/3]ip
address 10.30.1.1 24
[RouterA-GigabitEthernet3/1/3]pim
sm
＃配置连接RouterC的接口地址，并且启用PIM-SM协议
[RouterA]interface
gigabitethernet3/1/2
[RouterA-GigabitEthernet3/1/2]ip
address 10.20.1.1 24
[RouterA-GigabitEthernet3/1/2]pim
sm
＃配置SSM组地址范围
[RouterA]acl
number 2000
[RouterA-acl-basic-2000]rule
permit source 225.0.0.0 0.255.255.255
[RouterA-acl-basic-2000]pim
[RouterA-pim]ssm-policy
2000
＃发布PIM接口单播路由
[RouterA]ospf
[RouterA-ospf-1]import-route
direct
[RouterA-ospf-1]area
0.0.0.0
[RouterA-ospf-1-area-0.0.0.0]network
10.0.0.0 0.255.255.255
2、配置文件
#
multicast
routing-enable
#
acl
number 2000
rule permit source 225.0.0.0
0.255.255.255
#
interface
GigabitEthernet3/1/1
ip address 10.10.1.1
255.255.255.0
pim sm
#
interface
GigabitEthernet3/1/2
ip address 10.20.1.1
255.255.255.0
pim sm
#
interface
GigabitEthernet3/1/3
ip address 10.30.1.1
255.255.255.0
pim sm
#
ospf
1
import-route direct
area 0.0.0.0
network 10.0.0.0
0.255.255.255
network 1.1.1.1 0.0.0.0
#
pim
ssm-policy 2000
#
1、配置步骤
＃全局启动组播路由
[RouterB]multicast
routing-enable
＃配置连接RouterA的接口地址，并且启用PIM-SM协议
[RouterB]interface
gigabitethernet3/1/3
[RouterB-GigabitEthernet3/1/3]ip
address 10.30.1.2 24
[RouterB-GigabitEthernet3/1/3]pim
sm
＃配置连接RouterC的接口地址，并且启用PIM-SM协议
[RouterB]interface
gigabitethernet3/1/2
[RouterB-GigabitEthernet3/1/2]ip
address 10.40.1.1 24
[RouterB-GigabitEthernet3/1/2]pim
sm
＃配置连接HostA的接口地址，并且启用PIM-SM和IGMPv3协议
[RouterB]interface
gigabitethernet3/1/1
[RouterB-GigabitEthernet3/1/1]ip
address 10.101.1.1 24
[RouterB-GigabitEthernet3/1/1]pim
sm
[RouterC-GigabitEthernet3/1/1]igmp
enable
[RouterC-GigabitEthernet3/1/1]igmp
version 3
＃配置SSM组地址范围
[RouterB]acl
number 2000
[RouterB-acl-basic-2000]rule
permit source 225.0.0.0 0.255.255.255
[RouterB-acl-basic-2000]pim
[RouterB-pim]ssm-policy
2000
＃发布PIM接口单播路由
[RouterB]ospf
[RouterB-ospf-1]import-route
direct
[RouterB-ospf-1]area
0.0.0.0
[RouterB-ospf-1-area-0.0.0.0]network
10.0.0.0 0.255.255.255
2、配置文件
#
multicast
routing-enable
#
acl
number 2000
rule permit source 225.0.0.0
0.255.255.255
#
interface
GigabitEthernet3/1/1
ip address 10.101.1.1
255.255.255.0
pim sm
igmp enable
igmp version 3
#
interface
GigabitEthernet3/1/2
ip address 10.40.1.1
255.255.255.0
pim sm
#
interface
GigabitEthernet3/1/3
ip address 10.30.1.2
255.255.255.0
pim sm
#
ospf
1
import-route direct
area 0.0.0.0
network 10.0.0.0
0.255.255.255
#
pim
ssm-policy 2000
#
1、配置步骤
＃全局启动组播路由
[RouterC]multicast
routing-enable
＃配置连接RouterA的接口地址，并且启用PIM-SM协议
[RouterC]interface
gigabitethernet3/1/2
[RouterC-GigabitEthernet3/1/2]ip
address 10.20.1.2 24
[RouterC-GigabitEthernet3/1/2]pim
sm
＃配置连接RouterB的接口地址，并且启用PIM-SM协议
[RouterC]interface
gigabitethernet3/1/3
[RouterC-GigabitEthernet3/1/3]ip
address 10.40.1.2 24
[RouterC-GigabitEthernet3/1/3]pim
sm
＃配置连接HostB的接口地址，并且启用PIM-SM和IGMPv3协议
[RouterC]interface
gigabitethernet3/1/1
[RouterC-GigabitEthernet3/1/1]ip
address 10.102.1.1 24
[RouterC-GigabitEthernet3/1/1]pim
sm
[RouterC-GigabitEthernet3/1/1]igmp
enable
[RouterC-GigabitEthernet3/1/1]igmp
version 3
＃配置SSM组地址范围
[RouterC]acl
number 2000
[RouterC-acl-basic-2000]rule
permit source 225.0.0.0 0.255.255.255
[RouterC-acl-basic-2000]pim
[RouterC-pim]ssm-policy
2000
＃发布PIM接口单播路由
[RouterC]ospf
[RouterC-ospf-1]import-route
direct
[RouterC-ospf-1]area
0.0.0.0
[RouterC-ospf-1-area-0.0.0.0]network
10.0.0.0 0.255.255.255
2、配置文件
#
multicast
routing-enable
#
acl
number 2000
rule permit source 225.0.0.0
0.255.255.255
#
interface
GigabitEthernet3/1/1
ip address 10.101.1.1
255.255.255.0
pim sm
igmp enable
#
interface
GigabitEthernet3/1/2
ip address 10.40.1.1
255.255.255.0
pim sm
#
interface
GigabitEthernet3/1/3
ip address 10.30.1.2
255.255.255.0
pim sm
#
ospf
1
import-route direct
area 0.0.0.0
network 10.0.0.0
0.255.255.255
#
pim
ssm-policy 2000
#
可通过以下方式验证上述配置：
假如HostA需要接收组播组G（225.1.1.1）的信息，通过使用display pim
routing-table命令可以查看路由器的PIM路由表信息。通过配置改变SSM组地址范围。
比如：
#查看RouterB上的PIM路由表信息:
[RouterB]
display pim routing-table
Total
0 (*, G) entry; 1 (S, G) entry
(10.10.1.2,
225.1.1.1)
RP: 1.1.1.1
Protocol: pim-sm, Flag: SPT ACT
UpTime:
Upstream interface: GigabitEthernet3/1/3
Upstream neighbor: 10.30.1.1
RPF prime neighbor: 10.30.1.1
Downstream interface(s) information:
Total number of downstreams: 1
1: GigabitEthernet3/1/1
Protocol: pim-sm, UpTime:
