《第四章 PIM SSM实现域间组播》由会员分享，可在线阅读，更多相关《第四章 PIM SSM实现域间组播（5页珍藏版）》请在金锄头文库上搜索。
1、第四章 PIM SSM实现域间组播在网络中实现SSM有以下优点：1、 不需要管理组播地址2、 防止了不明的组播源服务的攻击3、 便于安装、管理4、 用于Internet的广播应用（IPTV）非常理想PIM SSM默认情况下使用232.0.0.0/8的组播地址，路由器识别出是加入在这个范围内的组播组，均采用SSM的方式来运行。这个案例将会测试SSM的基本运行情况，SSM不再以来与RP来完成组播树的建设，因此在一个纯IPM SSM的环境下，不需要配置RP地址，启用SSM使用全局命令ip pim ssm default使用的拓扑如下：R1的具体配置hostname R1no ip domain lo
2、okupip multicast-routing interface Loopback0 ip address 1.1.1.1 255.255.255.255interface Serial1/0 ip address 12.1.1.1 255.255.255.0 ip pim sparse-modeclock rate 64000interface Serial2/0 ip address 13.1.1.1 255.255.255.0 ip pim sparse-moderouter ospf 1 router-id 1.1.1.1network 0.0.0.0 255.255.255.25
3、5 area 0ip pim ssm default R2的具体配置hostname R2no ip domain lookupip multicast-routing interface Loopback0 ip address 2.2.2.2 255.255.255.255interface Ethernet0/0 ip address 10.1.1.2 255.255.255.0 ip pim sparse-modeinterface Serial1/0 ip address 24.1.1.2 255.255.255.0 ip pim sparse-modeclock rate 6400
4、0interface Serial2/0 ip address 12.1.1.2 255.255.255.0 ip pim sparse-moderouter ospf 1 router-id 2.2.2.2network 0.0.0.0 255.255.255.255 area 0ip pim ssm defaultR3的具体配置hostname R3no ip domain lookupip multicast-routing interface Loopback0 ip address 3.3.3.3 255.255.255.255interface Ethernet0/0 ip add
5、ress 10.1.1.3 255.255.255.0 ip pim sparse-modeinterface Serial1/0 ip address 13.1.1.3 255.255.255.0 ip pim sparse-modeclock rate 64000interface Serial2/0 ip address 35.1.1.3 255.255.255.0 ip pim sparse-mode serial restart-delay 0router ospf 1 router-id 3.3.3.3network 0.0.0.0 255.255.255.255 area 0ip
6、 pim ssm defaultR4的具体配置hostname R4no ip domain lookupip multicast-routing interface Loopback0 ip address 4.4.4.4 255.255.255.255interface Serial2/0 ip address 24.1.1.4 255.255.255.0 ip pim sparse-moderouter ospf 1 router-id 4.4.4.4network 0.0.0.0 255.255.255.255 area 0ip pim ssm defaultR5的具体配置hostna
7、me R5no ip domain lookupip multicast-routing interface Loopback0 ip address 5.5.5.5 255.255.255.255interface Serial1/0 ip address 35.1.1.5 255.255.255.0 ip pim sparse-modeclock rate 64000router ospf 1 router-id 5.5.5.5network 0.0.0.0 255.255.255.255 area 0ip pim ssm default注意一点的就是：末节客户端主机支持IGMPv3，即可
8、加入到SSM网络中，如果不支持IGMPv3，还有另外3种解决方案：1：IGMPv3 lite主机信令，即在客户端安装一个程序库使之支持部分IGMPv3（这一部分正是SSM所需要的）。2：URD主机信令，以来URP web服务器及Cisco路由器在末跳（最接近客户位置）截获客户（S，G）信道订阅（同时客户端使用IGMPv2加入组）。3：DNS解析，SSM Mapping 建立组播加入组和源的映射关系。（新版本IOS似乎已经取消这个功能）。我们把R4作为一个支持IGMPv3的客户端主机，加入到（5.5.5.5,232.1.1.1）这个源组里：ip igmp static-group 232.1.1
9、.1 source 5.5.5.5R2# sh ip mrou IP Multicast Routing TableFlags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT, M - MSDP created entry, X - Proxy Join Timer Running, A - Candidate for MSDP
10、 Advertisement, U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel, z - MDT-data group sender, Y - Joined MDT-data group, y - Sending to MDT-data groupOutgoing interface flags: H - Hardware switched, A - Assert winner Timers: Uptime/Expires Interface state: Interface, Next-Hop o
11、r VCD, State/Mode(5.5.5.5, 232.1.1.1), 00:00:15/00:03:15, flags: sT Incoming interface: Ethernet0/0, RPF nbr 10.1.1.3 Outgoing interface list: Serial1/0, Forward/Sparse, 00:00:15/00:03:15(*, 224.0.1.40), 00:33:07/stopped, RP 0.0.0.0, flags: DCL Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing inte
12、rface list:Serial1/0, Forward/Sparse, 00:33:07/00:00:52R3#sh ip mrou IP Multicast Routing TableFlags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT, M - MSDP created entry, X - Proxy Join
13、Timer Running, A - Candidate for MSDP Advertisement, U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel, z - MDT-data group sender, Y - Joined MDT-data group, y - Sending to MDT-data groupOutgoing interface flags: H - Hardware switched, A - Assert winner Timers: Uptime/Expires I
14、nterface state: Interface, Next-Hop or VCD, State/Mode(5.5.5.5, 232.1.1.1), 00:00:22/00:03:08, flags: sT Incoming interface: Serial2/0, RPF nbr 35.1.1.5 Outgoing interface list: Ethernet0/0, Forward/Sparse, 00:00:22/00:03:08(*, 224.0.1.40), 00:31:35/stopped, RP 0.0.0.0, flags: DCL Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list:Serial1/0, Forward/Sparse, 00:31:35/00:00:23SSM只有最短路径树，在R1上面是看不到（5.5.5.5,232.1.1.1）组信息的：R1#show ip mroute 5.5.5.5 232.1.1.1Group 232.1.1.1 not found但是ip igmp static-group 是不支持用ping 测试的，无法从R5上面以5.5.5.5为源ping通232.1.1.1组地址。
