The Cisco Discovery Protocol does not possess inherent security mechanisms and is vulnerable to attacks. The Secure Cisco Discovery Protocol feature allows users to select the type, length, value (TLV) fields that are sent on a particular interface to filter information sent through Cisco Discovery Protocol packets.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cdp/configuration/15-mt/cdp-15-mt-book/nm-cdp-secure-cdp.html
CDP is supported of FR interface and subinterfaces, but not by default:
=================================
Hub#sh run int s1/0.901
!
interface Serial1/0.901 point-to-point
ip address 10.0.91.9 255.255.255.0
frame-relay interface-dlci 901
end
Hub#sh run int s1/0.902
!
interface Serial1/0.902 point-to-point
ip address 10.0.92.9 255.255.255.0
frame-relay interface-dlci 902
end
!
Hub#sh cdp neighbors | b Device
Device ID Local Intrfce Holdtme Capability Platform Port ID
Spoke2 Ser 1/0.902 14 R 7206VXR Ser 1/0
Spoke1 Ser 1/0.901 15 R 7206VXR Ser 1/0
==============================
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