Assuming you're using a provider's network, you should contact your provider and have them check it out.
It could be a provisioning error, it could be a DLCI available for monitoring services (provider offering a paid service for trap & interface monitoring).
If it's coming from the cloud, the provider should be able to track it down.
If you're running a private "cloud," then it could be a provisioning error on your head-end router(s) or something left over from a previous implementation.
Good Luck
Scott
