The stp snooping enable command enables STP snooping.
The undo stp snooping enable command disables STP snooping.
By default, STP snooping is disabled on interfaces.
After you run the l2protocol-tunnel command to enable transparent transmission of Layer 2 protocol packets on untagged interfaces or the l2protocol-tunnel vlan command to enable transparent transmission of Layer 2 protocol packets on tagged interfaces, the untagged or tagged interfaces directly forward Layer 2 protocol packets sent from user networks over the ISP network but not send them to the CPU for processing. When a device enabled with Layer 2 protocol tunneling receives TC packets, the device clears the MAC entries and ARP entries and updates the forwarding table after the stp snooping enable command is executed.