Administrator Guide

Figure 107. Controlling Bridge with Port Extenders
1.
Controlling Bridge (C9010) 2. Cascade ports on controlling bridge
3. 10GbE uplink ports on PEs 4. Standalone PE
5. PE stack 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.
Upstream port A port on a bridge port extender that connects to a cascade port. In the case of the connection between
two bridge port extenders, the upstream port is the port furthest from the controlling bridge.
Port Extenders (PEs) 701