Siemens S323 User Manual

User Manual                                                                               UMN:CLI 
SURPASS hiD 6615 S223/S323 R1.5 

A50010-Y3-C150-2-7619                                                                         315 

To define the Source Specific Multicast (SSM) range of IP multicast addresses, use the 
following command. When an SSM range of IP multicast addresses is defined by the ip 
pim ssm

 command, no Multicast Source Discovery Protocol (MSDP) Source-Active (SA) 

messages will be accepted or originated in the SSM range. 

 {<1-99> | AC-

} 

Defines the SSM range of IP multicast address. 
1-99: simple access list 
ACCESS-LIST: IP named standard access list 

Configures the SSM by default. 

Global 

Disables the command. 

 

PIM Snooping is used to reduce unnecessary bandwidth by restricting data and multicast 
control packets which transmitted between each port. In networks where a Layer 2 switch 
interconnects several routers, the switch floods IP multicast packets on all multicast router 
ports by default, even if there are no multicast receivers downstream. If PIM Snooping is 
enabled, the switch restricts multicast packets for each IP multicast group to only those 
multicast router ports that have downstream receivers joined to that group. And the switch 
learns which multicast router ports need to receive the multicast traffic within a specific 
VLAN by listening to the PIM hello messages, PIM join and prune messages. 

To configure PIM Snooping, use the following command. 

Enables PIM Snooping function on the switch. 

 VLANS 

Enables PIM Snooping function on a specific interface.

 

 vlan VLANS 

Global 

Disables the PIM Snooping command. 

 

To delete all L2 PIM snooping multicast groups of a specified port, multicast address or 
vlan, use the following command.   

[A.B.C.D] 

Deletes all PIM snooping groups and source addresses 
of a specified multicast group address. 

[port PORTS] 

Deletes all PIM snooping groups and source addresses 
of a specified port. 

[vlan VLANS] 

Enable 

Global 
Bridge 

Deletes all of the multicast router addresses and DR of 
a specified VLAN. 

 

By default, PIM Snooping is disabled. To operate PIM Snooping, IGMP Snooping should 
be enabled as well.