Enabling PIM6 SM Snooping

Use IPv6 PIM-Sparse Mode (PIM6 SM) snooping only in topologies where multiple PIM sparse routers connect through a device. PIM6 SM snooping does not work on a PIM dense mode router which does not send join messages and traffic to PIM dense ports is stopped. A PIM6 SM snooping-enabled device displays a warning if it receives PIM dense join or prune messages.

The PIM6 SM traffic snooping feature assumes that the network has routers that are running PIM6 SM.
  1. Enter global configuration mode.
    device# configure terminal
  2. Enable MLD snooping passive globally.
    
    device(config)# ipv6 multicast passive
    The device must be in passive mode before it can be configured for PIM SM snooping.
  3. Enable PIM6 SM snooping globally.
    
    device(config)# ipv6 pimsm-snooping