GE 2/0/0 VLANIF 400 192.168.3.1/24
SwitchD GE 1/0/0 VLANIF 500 192.168.4.2/24
GE 2/0/0 VLANIF 200 192.168.1.2/24
GE 3/0/0 VLANIF 103 10.110.5.1/24
GE 4/0/0 VLANIF 104 10.110.4.1/24
SwitchE GE 1/0/0 VLANIF 400 192.168.3.2/24
GE 2/0/0 VLANIF 300 192.168.2.2/24
GE 3/0/0 VLANIF 100 192.168.9.2/24
GE 4/0/0 VLANIF 500 192.168.4.1/24
Configuration Roadmap
The ISP network connects to the Internet. The PIM-SM protocol is used to configure the
multicast function, which facilitates service expansion. The ASM and SSM models provide
multicast services. The configuration roadmap is as follows:
1. Configure the IP addresses of interfaces and the unicast routing protocol. PIM is an intra-
domain multicast routing protocol that depends on a unicast routing protocol. The multicast
routing protocol can work normally after the unicast routing protocol works normally.
2. Enable multicast on all Switches providing multicast services. Before configuring other
PIM-SM functions, you must enable the multicast function.
3. Enable PIM-SM on all the interfaces of Switches. After PIM-SM is enabled, you can
configure other PIM-SM functions.
NOTE
If IGMP is also required on this interface, PIM-SM must be enabled before IGMP is enabled. The
configuration order cannot be reversed; otherwise, the configuration of PIM fails.
4. Enable IGMP on the interfaces of Switches connected to hosts. A receiver can join and
leave a multicast group freely by sending an IGMP message. The leaf Switches maintain
the multicast membership through IGMP.
5. Enable the PIM silent function on interface that is directly connected to hosts. In this
manner, malicious hosts are prevented from simulating PIM Hello messages and security
of multicast routers is ensured.
NOTE
PIM silent is applicable only to the interfaces of a Switch directly connected to the host network
segment that is connected only to this Switch.
6. Configure the RP. The RP is a root node of an RPT on the PIM-SM network. It is
recommended that you configure the RP on a device that has more multicast flows, for
example, SwitchE in Figure 6-2.
NOTE
l After creating an (*, G) entry according to the new multicast membership, the DR on the user
side sends Join/Prune messages towards the RP and updates the shared tree on the path.
l When a multicast data source starts to send data to groups, the DR unicasts the Register message
to the RP. After receiving the Register message, the RP decapsulates it and then forwards it to
other multicast members along the shared tree. At the same time, the RP sends a Register-Stop
message to the DR on the multicast source side. After the Register-Stop is performed, the RPT
can be switched to the SPT.
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 6 PIM-SM (IPv4) Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
197
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