Cisco Discovery Protocol (CDP)

Let's look at exactly what CDP is looking at and we will use the following topology to test:

We are going to use this topology to use the CDP protocol, but before we can use CDP, it must be turned on globally and under each interface. Within global configuration, we would type cdp run, and under each interface, we would type cdp enable:

Once we have turned on CDP on all routers and their interfaces, we can now see who our neighbors are. The two commands we are going to look at are show cdp neighbor and show cdp ...

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