A short note on how to get available CDP (Cisco Discovery Protocol) information on Linux systems.

The following example is for Ubuntu GNU/Linux:

$ sudo dnf install -y lldpd
$ sudo systemctl enable --now lldpd.service
$ sudo lldpctl

The result will look somewhat similar:

root@host:~# lldpctl ens6f0np0
-------------------------------------------------------------------------------
LLDP neighbors:
-------------------------------------------------------------------------------
Interface:    ens6f0np0, via: LLDP, RID: 2, Time: 0 day, 00:00:22
  Chassis:
    ChassisID:    mac 5c:xx:xx:xx:41:40
    SysName:      swic.domain.tdl
    SysDescr:     Cisco Nexus Operating System (NX-OS) Software 10.3(6)
                  TAC support: http://www.cisco.com/tac
                  Copyright (c) 2002-2024, Cisco Systems, Inc. All rights reserved.
    MgmtIP:       192.168.178.250
    MgmtIface:    83886080
    Capability:   Bridge, on
    Capability:   Router, on
  Port:
    PortID:       ifname Ethernet1/25
    PortDescr:    hostname-nic1
    TTL:          120
    MFS:          9216
  VLAN:         50, pvid: no VLAN0050
  VLAN:         60, pvid: no VLAN0060
  VLAN:         70, pvid: yes VLAN0070
  VLAN:         75, pvid: no VLAN0075
  Unknown TLVs:
    TLV:          OUI: 00,01,42, SubType: 1, Len: 1 01
    TLV:          OUI: 00,80,C2, SubType: 7, Len: 5 01,00,00,00,00
-------------------------------------------------------------------------------