In general, techniques are described herein for implementing priority channels by prioritizing and communicating control packets on an interface between a disaggregated Broadband Network Gateway control plane and the disaggregated Broadband Network Gateway user plane. In some examples, a method includes assigning, by a disaggregated broadband network gateway (DBNG) user plane device, a control packet for a control protocol to an assigned priority channel of a plurality of priority channels within a common tunnel for a shared interface with a DBNG control plane system, the DBNG user plane device physically separate from the DBNG control plane system; and sending the control packet to the DBNG control plane system using the assigned priority channel.