1-7Enabling Forwarding of Jumbo FramesDue to tremendous amount of traffic occurring on an Ethernet interface, it is likely that some framesgreater than the standard Ethernet frame size are received. Such frames (called jumbo frames) will bedropped. With forwarding of jumbo frames enabled, the system does not drop all the jumbo frames.Instead, it continues to process jumbo frames with a size greater than the standard Ethernet frame sizeand yet within the specified parameter range.In global configuration mode (system view), you can set the length of jumbo frames that can passthrough the Ethernet interface.Follow these steps to enable the forwarding of jumbo frames:To do… Use the command… RemarksEnter system view system-view —Enable the forwarding of jumboframes jumboframe enableRequiredBy default, the deviceallows jumbo frames withthe length of 10.240 bytesto pass through allEthernet interfaces.Enabling Loopback Detection on an Ethernet InterfaceIf a port receives a packet that it sent out, a loop occurs. Loops may cause broadcast storms. Thepurpose of loopback detection is to detect loops on an interface.When loopback detection is enabled on an Ethernet interface, the device periodically checks whetherthe ports have any external loopback. If it detects a loopback on a port, the device will set that port to beunder loopback detection mode.z If loops are detected on an access port, the port will be blocked. Meanwhile, trap messages will besent to the terminal, and the corresponding MAC address forwarding entries will be removed.z If loops are detected on a trunk port or a hybrid port, trap messages are sent to the terminal. If theloopback detection control function is also enabled on the port, the port will be blocked, trapmessages will be sent to the terminal, and the corresponding MAC address forwarding entries willbe removed.Follow these steps to configure loopback detection:To do… Use the command… RemarksEnter system view system-view —Enable global loopbackdetection loopback-detection enable RequiredDisabled by defaultConfigure the interval for portloopback detectionloopback-detectioninterval-time timeOptional30 seconds by defaultEnter Ethernet interface view interface interface-typeinterface-number —
