Switches Are Directly Connected
As shown in Figure 1, traffic of services with different priorities is sent to the core network through the UPE and PE-AGG. To ensure the bandwidth and reliability of the link between the UPE and PE-AGG, a LAG, Eth-Trunk 1, is established.
You can determine the working mode for the Eth-Trunk according to the following situations:
If devices at both ends of the Eth-Trunk support LACP, the LACP mode is recommended.
If the device at either end of the Eth-Trunk does not support LACP, you must use the manual mode.
QoS can be implemented on an Eth-Trunk as a common interface. At both ends (UPE and PE-AGG) of Eth-Trunk 1, traffic shaping, congestion management, and congestion avoidance can be performed for outgoing traffic, ensuring that packets of high priorities are sent in a timely manner.