Which is a protocol used on the management plane?

The Simple Network Management Protocol (SNMP) is a protocol used on the management plane. SNMP is used for the management of routers and switches because it can be writeable and allow for configuration. The Cisco Discovery Protocol (CDP) is a control protocol because it communicates port properties via layer 2 frames, such as power requirements. The Internet Control Message Protocol (ICMP) is a control protocol, because it is used to send control messages back to the originating device. The VLAN Trunking Protocol (VTP) is used to communicate the control information of VLANs to other participating switches.