https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cdp/configuration/15-mt/cdp-15-mt-book/nm-cdp-discover.html
The information contained in Cisco Discovery Protocol advertisements varies based on the type of device and the installed version of the operating system. Some of the information that Cisco Discovery Protocol can learn includes:
Cisco IOS version running on Cisco devices
Hardware platform of devices
IP addresses of interfaces on devices
Locally connected devices advertising Cisco Discovery Protocol
Interfaces active on Cisco devices, including encapsulation type
Hostname
Duplex setting
***VLAN Trunking Protocol (VTP) domain
***Native VLAN
The information contained in Cisco Discovery Protocol advertisements varies based on the type of device and the installed version of the operating system. Some of the information that Cisco Discovery Protocol can learn includes:
Cisco IOS version running on Cisco devices
Hardware platform of devices
IP addresses of interfaces on devices
Locally connected devices advertising Cisco Discovery Protocol
Interfaces active on Cisco devices, including encapsulation type
Hostname
Duplex setting
VLAN Trunking Protocol (VTP) domain
Native VLAN
CDP is primarily used to share basic device information, such as device names, IP addresses, capabilities, native VLAN, and VTP domain. It does not share detailed Layer 2 protocol configurations like trunking protocols or spanning-tree details.
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