Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 770

Figure 104. Controlling Bridge with Port Extenders 1. Controlling Bridge (C9010) 3. 10GbE uplink ports on PEs 5. PE stack 2. Cascade ports on controlling bridge 4. Standalone PE (C1048P) 6. Cable connections in a ring topology 802.1BR Terms and Definitions The 802.1BR protocol uses the following terms to describe the operation of a controlling bridge and attached port extenders. 802.1BR Term Definition Cascade port A port on a controlling bridge or bridge port extender that connects to an upstream port. In the case of the connection between two bridge port extenders, the cascade port is the port closest to the controlling bridge. Controlling bridge A bridge that supports one or more bridge port extenders. Port extender (PE) A bridge port extender that is not physically part of a controlling bridge, but is controlled by the controlling bridge. 770 Port Extenders (PEs)