Planet XGS3-24042 User Manual download pdf (Page 431)

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Source Specific Multicast (PIM-SSM) is a new kind of multicast service protocol. With PIM-SSM, a multicast

session is distinguished by the multicast group address and multicast source address. In SSM, hosts can be

added into the multicast group manually and efficiently like the traditional PIM-SM, but leave out the shared

tree and RP management in PIM-SM. In SSM, SPT tree will be constructed with (S, G). G for the multicast

group address and S for the source address of the multicast which sends datagram to G. (S, G) in a pair is

named as a channel of SSM. SSM serves best for the application of multicast service which is from one

station to many ones, for example, the network sports video channel, and the news channel. By default, the

multicast group address of SSM is limited between 232.0.0.0 and 232.255.255.255. However this address

range can be extended according to actual situations.

48.6.2 PIM-SSM Configuration Task List

Command

Explanation

Global Configuration Mode

ip multicast ssm {default|range

<access-list-number >}

no ip multicast ssm

To configure the address range for pim-ssm. The

no form command will disable the configuration.

48.6.3 PIM-SSM Configuration Examples

As the figure shows, ethernet interfaces from SwitchA, SwitchB, SwitchC, and SwitchD are configured to be in

separate VLANs. And PIM-SSM is enabled globally by enabling the PIM-SM or PIM-DM protocol on the VLAN

interfaces. Take PIM-SM for example.

Figure 48-7 PIM-SSM typical environment

Configurations of SwitchA, SwitchB, SwitchC, and SwitchD are shown as below.

(1) Configuration of Switch A

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