Filter
Top Products
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.
For information on how to enable PIM-SM snooping and disable PIM DR flooding, refer to PIM-SM
Snooping on page 767.
PIM-SM Snooping
PIM-SM Snooping 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.
Table 34-1. Egress Ports Used for Multicast Traffic with PIM-SM and IGMP Snooping
Multicast Traffic PIM-SM and IGMP Snooping Configuration Egress Ports
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