CCNA Cisco Certified Network Associate Study Guide - FTP Server

CDP with the 1900 Switch 607
The above command does not affect the switch too much unless you have
VLANs set. The switch will work fine without a configuration. However,
adding an IP address for management is recommended.
CDP with the 1900 Switch
CDP works with all Cisco devices, including the Catalyst 1900 switch.
The output on the 1900 switch looks like this:
switch#sh cdp
Global CDP information :
CDP version: 2
Sending CDP packets every 60 seconds
Sending a holdtime value of 180 seconds
#
Notice that both the router and the switch have a CDP timer of 60 seconds
and a holdtime of 180 seconds. (See Chapter 7 for a refresher on CDP
with Cisco routers). This means that CDP information received from neighbor
routers will be kept for 180 seconds. If the router or switch does not hear
from the neighbor again before the holdtime expires, the information will be
discarded.
The 1900 switch has an option to advertise CDP version 2, which is a newer
version of CDP running on some new Cisco devices. The 1900 switch can send
both version CDP 1 and 2 and receive version 1 of CDP. CDP version 2 is not
discussed in this appendix.
You can change the timers on both devices with the cdp timer and cdp
holdtime commands from global configuration mode:
switch#config t
Enter configuration commands, one per line. End with
CNTL/Z
switch(config)#cdp ?
advertise-v2 CDP sends version-2 advertisements