Information About CDP
This section includes information about CDP.
The Cisco Discovery Protocol (CDP) is an advertisement protocol used by Cisco devices to advertise itself to other Cisco devices in the same network. CDP runs on the data link layer and is independent of Layer 3 protocols. Cisco devices that receive the CDP packets cache the information to make it accessible through the CLI and SNMP.
The Cisco NX-OS software supports CDP on the management Ethernet (mgmt0) interface on the supervisor module and the Gigabit Ethernet interfaces on the IP Storage Services (IPS) and 14/2-port Multiprotocol Services (MPS-14/2) modules. The CDP daemon is restartable and switchable. The running and startup configurations are available across restarts and switchovers.
CDP version 1 (v1) and version 2 (v2) are supported in Cisco MDS 9000 Family switches. CDP packets with any other version number are silently discarded when received.
When the interface link is established, CDP is enabled by default and three CDP packets are sent at 1-second intervals. Following this action, the CDP frames are sent at the globally configured refresh interval.
High Availability for CDP
The Cisco NX-OS software supports stateless restarts for CDP. After a reboot or a supervisor module switchover, the Cisco NX-OS software applies the running configuration. For more information on high availability, see the .