CCNA Cisco Certified Network Associate Study Guide - FTP Server

Using Cisco Discovery Protocol 347
The following output shows the show cdp neighbor command used on
a 2509 router.
Todd2509#sh cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
1900Switch Eth 0 238 T S 1900 2
2500B Ser 0 138 R 2500 Ser 0
Todd2501#
Table 7.5 summarizes the information displayed by the show cdp
neighbor command for each device.
TABLE 7.5 Output of the show cdp neighbor Command
Field Description
Device ID The hostname of the device directly connected.
Local Interface The port or interface on which you are receiving the CDP
packet.
Holdtime The amount of time the router will hold the information
before discarding it if no more CDP packets are received.
Capability The neighbor’s capability, such as router, switch, or repeater.
The capability codes are listed at the top of the
command output.
Platform The type of Cisco device. In the above output, a Cisco
2509, Cisco 2511, and Catalyst 5000 are attached to the
switch. The 2509 only sees the switch and the 2501
router connected through its serial 0 interface.
Port ID The neighbor device’s port or interface on which the
CDP packets are broadcast.
Another command that provides neighbor information is the show cdp
neighbor detail command (show cdp nei de for short), which also can