Shortest Path Bridging (SPB) and Protocol Independent Multicast (PIM) cannot interoperate with each other on the switch at the same time. The boot flag called spbm-config-mode ensures that SPB and PIM stay mutually exclusive.
The spbm-config-mode boot flag is enabled by default. This enables you to configure SPB and IS-IS, but you cannot configure PIM either globally or on an interface.
If you disable the boot flag, save the configuration and reboot with the saved configuration. After you enable the flag, you can configure PIM and IGMP Snooping, but you cannot configure SPB or IS-IS.
Important
Any change to the spbm-config-mode boot flag requires a reboot for the change to take effect.
If you disable the boot flag, save the configuration and reboot with the saved configuration. After you disable the flag, you can configure PIM and IGMP Snooping, but you cannot configure SPB or IS-IS.
For more information, see IP Multicast.