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DES-7200 Configuration Guide Chapter 10 PIM-Snooping Configuration
10-3
Caution
The IGMP Snooping must be enabled before enabling PIM Snooping.
The PIM Snooping only deals with the Layer 2 multicast flow management for
PIM-SM. If the Layer 3 multicast is enabled with PIM-DM protocol, it is possible
that the multicast flow cannot be forwarded normally.
10.4.2 Enabling the PIM Snooping on the interface
The PIM Snooping must be enabled on the SVI interfaces respectively. With the
PIM Snooping enabled on the interface, you can snoop the PIM messages,
maintain and update the Layer 2 multicast forwarding table on the interface.
To enable the PIM snooping on the interface, execute the following commands:
Command Function
DES-7200(config)# interface vlan
vlan_ID
Enter the SVI interface configuration
mode.
DES-7200(config-if)# ip pim snooping
Enable the PIM Snooping on the interface.
The following example will show how to enable the PIM Snooping on the interface
and verify the configurations.
DES-7200(config)# interface vlan 199
DES-7200(config-if)# ip pim snooping
DES-7200(config-if)# end
DES-7200# show ip pim snooping
Global runtime mode: Enabled
Global admin mode : Enabled
DR Flooding status: Enabled
Number of user enabled VLANs: 1
User enabled VLANs: 199
Caution
When the VLAN and the multicast source are connected, PIM Snooping floods
the multicast flow to the interface connected to DR only. If another device in this
VLAN becomes the forwarder for the STP creation, PIM Snooping fails to
forward the multicast flow.
It is not recommended to enable the PIM Snooping in the VLAN with multicast
source.
10.5 Monitoring and Maintaining PIM-Snooping
PIM Snooping offers command show to monitor and maintain PIM Snooping. You
can view PIM Snooping information such as global configuration, neighboring list
and Layer 2 forwarding table by executing command show.
Use the following command to view PIM Snooping running status information:
Command Function
show ip pim snooping
Show global configuration information of
PIM Snooping.
show ip pim snooping neighbor
Show PIM Snooping neighbor
information.
show ip pim snooping vlan
Show PIM Snooping in a VLAN.
For the detailed usage of the above command, please refer to PIM-Snooping
Command Reference.