About global ports

A global port is a virtual port on the master device, such as a Layer 2 aggregate interface. A global port that acts as a neighbor port, downstream port, or router port is called a global neighbor port, global downstream port, and global router port, respectively.

Perform this task to decrease Layer 2 IPv6 multicast data interruption caused by the aging of IPv6 PIM snooping entries after a master/subordinate switchover.