If you don't enable CDP, there's something wrong with you.

Hmmm….I wonder what switch port this box is connected to???

[~]> apt-get install cdpr
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  cdpr
0 upgraded, 1 newly installed, 0 to remove and 31 not upgraded.
Need to get 17.4 kB of archives.
After this operation, 102 kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu/ trusty/universe cdpr amd64 2.4-1ubuntu1 [17.4 kB]
Fetched 17.4 kB in 0s (150 kB/s)
Selecting previously unselected package cdpr.
(Reading database ... 103666 files and directories currently installed.)
Preparing to unpack .../cdpr_2.4-1ubuntu1_amd64.deb ...
Unpacking cdpr (2.4-1ubuntu1) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Setting up cdpr (2.4-1ubuntu1) ...

[~]> ifconfig
eth0      Link encap:Ethernet  HWaddr 00:25:90:a8:e6:1e
          inet addr:10.1.1.188  Bcast:10.1.25.255  Mask:255.255.254.0
          inet6 addr: fe80::225:90ff:fea8:e61e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1014405338 errors:0 dropped:167145 overruns:0 frame:0
          TX packets:237792710 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1507693997786 (1.5 TB)  TX bytes:17683235227 (17.6 GB)
          Interrupt:16 Memory:dfa00000-dfa20000

eth1      Link encap:Ethernet  HWaddr 00:25:90:a8:e6:1f
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::225:90ff:fea8:e61f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4028437871 errors:0 dropped:594 overruns:0 frame:0
          TX packets:347873995 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:6080452972041 (6.0 TB)  TX bytes:29736430772 (29.7 GB)
          Interrupt:18 Memory:df900000-df920000

And finally, we can get some damn useful info:

[~]> cdpr -d eth0
cdpr - Cisco Discovery Protocol Reporter
Version 2.4
Copyright (c) 2002-2010 - MonkeyMental.com

Using Device: eth0
Waiting for CDP advertisement:
(default config is to transmit CDP packets every 60 seconds)
Device ID
  value:  awesomeswitchbr0
Addresses
  value:  10.1.1.2
Port ID
  value:  GigabitEthernet3/0/2

So don’t leave work today until you’ve ensured CDP is enabled on all your equipment. Additionally, there isn’t that much overhead as announcements only occur every 60 seconds by default.