I had made a typo configuring one of my switches and assigned an access port to a vlan that didn't exist on the switch. While trying to troubleshoot why I had no connectivity I noticed I had a one way CDP relationship. In other words I could see the router from the switch, but the router didn't see a cdp neighbor on the interface. Once I put the switchport in the right vlan I could see the switch.
Could anyone explain why this happens? It might help me understand CDP better. Thank you, Marc
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