Port Rate Description
The port rate is the nominal value of the rate at which a port transmits data. To meet various transmission rate requirements, pluggable modules with different rates are provided, including 100GE, 40GE, 10GE, and GE optical modules, and GE copper modules. Generally, the rate supported by a port corresponds to the rate of the pluggable module on the port, but it is also affected by the following factors: port rate auto-sensing, port auto-negotiation, port splitting, and port rate configuration.
Port Rate Auto-Sensing
Typically, port rate auto-sensing allows a port to automatically work at the rate of the medium that is installed, and you do not need to run a command to change the port rate.
Port Auto-Negotiation
Different from auto-sensing, auto-negotiation provides a mode of exchanging information between two ports on connected devices. You can connect the two ports through media that support rate auto-negotiation so that some port attribute settings can be negotiated and the two ports can automatically configure their transmission capabilities. The duplex mode, rate, and FEC of the two ports are negotiated. Ports at both ends of a physical link automatically select the same operating parameter settings by exchanging information. In this way, the transmission capabilities of the ports can reach the maximum supported by them.
Port Split
Port split allows a high-bandwidth physical port on the switch to be split into multiple independent low-bandwidth ports. With the port split function, ports on a card can connect to various types of ports on the remote device, allowing for flexible networking and lowering hardware costs. For example, a 40GE port on the CEL36LQFD-G can be split into 4 10GE ports.
Port Rate Configuration
In addition to the preceding methods, you can also run commands to change the port rate. For details, see "Configuring the Interface Rate" in the Configuration Guide - Interface Management Configuration Guide.