Not really an error. As far as direct communication no vlan needs to exist to receive traffic. The switch just will not send traffic until the port is operating properly. Wouldn't it be a bad thing if the switch sent traffic when it shouldn't?
Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Managing Partner / Sr. Instructor - IPexpert, Inc. Mailto: <mailto:[email protected]> [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: <http://www.ipexpert.com/chat> www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at <http://www.ipexpert.com/communities> www.ipexpert.com/communities and our public website at <http://www.ipexpert.com/> www.ipexpert.com From: [email protected] [mailto:[email protected]] On Behalf Of Abel ... Sent: Friday, August 20, 2010 10:09 AM To: marc abel Cc: [email protected] Subject: Re: [OSL | CCIE_RS] CDP question Maybe CPD have a behavior went a vlan is configure in a port. CDP is L1 protocol but in a switch the traffic must flow over a vlan no matter the type (by default 1). Maybe your config error create this error on the switch. Just maybe.. I never saw that behavior On Thu, Aug 19, 2010 at 9:47 PM, marc abel <[email protected]> wrote: 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 _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
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