DELL S50V User Manual

PIM Sparse-Mode | 767

•

It is recommended that you do not enable IGMP snooping on a PIM-SM snooping-enabled VLAN 
interface unless until it is necessary for VLAN operation.

 is supported on VLAN interfaces on platform: 

e

x

In a Layer 2 VLAN, a switch normally floods multicast traffic to all member ports in the VLAN. PIM-SM 
snooping is designed to restrict multicast traffic to only the PIM-SM-enabled routers and IGMP hosts that 
should receive the traffic. When PIM-SM snooping is enabled, the switch learns the multicast ports on 
which receivers are listening through PIM hello and PIM-SM join/prune messages, and forwards multicast 
traffic only to the VLAN ports connected to valid receivers.

Known multicast data 
packets

PIM-SM snooping DR flood with IGMP snooping flood

PIM-SM snooped VLANs
PIM DR port
IGMP snooped ports
IGMP mrouter ports

PIM-SM snooping DR flood with no IGMP snooping flood

PIM-SM snooped VLANs
PIM DR port
IGMP snooped ports
IGMP mrouter ports

IGMP flood with no PIM-SM snooping DR flood 

PIM-SM snooped VLANs
IGMP snooped ports
IGMP mrouter ports

No PIM-SM snooping DR flood and no IGMP snooping flood

PIM-SM snooped VLANs
IGMP snooped ports
IGMP mrouter ports

Unknown multicast 
data packets

PIM-SM snooping DR flood with IGMP snooping flood

PIM DR port

PIM-SM snooping DR flood with no IGMP snooping flood

PIM DR port
IGMP mrouter ports

IGMP flood with no PIM-SM snooping DR flood

None

No PIM-SM snooping DR flood and no IGMP snooping flood

IGMP mrouter ports