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Cisco Certified Network Associate (CCNA) · Cisco
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If a neighbor has no IP address on an interface enabled with Cisco Discovery Protocol, the IP address of another interface will be updated as IP address for the non-IP address interface. refer-https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cdp/configuration/15-mt/cdp-15-mt-book/nm-cdp-discover.html
CDP (Cisco Discovery Protocol) operates at Layer 2, so the interface itself does not need an IP address for CDP to function. If the CDP-enabled interface has no IP address, the device can advertise an IP address from another interface as its management/address information.
“If a neighbor has no IP address on an interface enabled with Cisco Discovery Protocol, the IP address of another interface will be updated as IP address for the non-IP address interface.” https://www.cisco.com/c/en/us/td/docs/routers/ios/config/17-x/syst-mgmt/b-system-management/m_nm-cdp-discover-xe.html