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Community Member

CDP

Does CDP use VLAN1 or will it communicate over other VLANS?

4 REPLIES
Community Member

Re: CDP

CDP will comunicate over every port on a switch regardless of it's vlan configuration. So if a port is connected to another cisco device and configured assigned to another vlan, cdp will still work.

Purple

Re: CDP

This also comes with the caveat that cdp can be turned on and off on a per port basis if wanted or needed .

Community Member

Re: CDP

I believe CDP uses layer 2 multicasts?

Community Member

Re: CDP

CDP uses L2 Multicast, specifically a cisco reserved group address.

If you are communicating 2 access ports, messages will go on the configured vlan. If messages go through a trunk link, it will use VLAN ID 1 for ISL or dot1q.

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