Manual

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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.
28.6.2 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.
28.6.3 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.
PIM-SSM typical environment
Configurations of SwitchA, SwitchB, SwitchC, and SwitchD are shown as below.
(1) Configuration of SwitchA.
switch A
switch B
switch C
switch D
Ethernet 1/0/2
vlan 2 bsr
Ethernet 1/0/1
vlan 1
Ethernet 1/0/1
vlan 1
Ethernet 1/0/2
vlan 2
Ethernet 1/0/2
vlan 2
Ethernet 1/0/2
vlan 2 rp
Ethernet 1/0/3
vlan 3
Ethernet 1/0/1
vlan 1
Ethernet 1/0/1
vlan 1
Ethernet 1/0/3
vlan 3