1-9Enabling Forwarding of Jumbo FramesDue to tremendous amount of traffic occurring on an Ethernet port, it is likely that some frames greaterthan the standard Ethernet frame size are received. Such frames (called jumbo frames) will be dropped.With forwarding of jumbo frames enabled, the system does not drop all the jumbo frames. Instead, itcontinues to process jumbo frames with a size greater than the standard Ethernet frame size and yetwithin the specified parameter range.In global configuration mode (system view), you can set the length of jumbo frames that can passthrough the Ethernet port.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 enableOptional.By default, the deviceallows jumbo frames withthe length of 10240 bytesto pass through all Layer 2Ethernet ports.Enabling Loopback Detection on an Ethernet PortIf an interface 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 enabledon an Ethernet port, the device periodically checks for loops on the interface. If a loop is detected on theinterface, the device operates on the port according to the pre-configured loopback detection actions,and sends a trap message to the terminal.z When a loop is detected on an access port, the device puts the port in control mode. In this mode,inbound packets on the port are all discarded, while outbound packets on the port are forwardednormally. Meanwhile, the device sends trap messages to the terminal, and deletes thecorresponding MAC address forwarding entry.z When a loop is detected on a trunk port or a hybrid port, the device sends a trap message to theterminal. If loopback detection control is enabled on the port, the device places the port in controlmode and discards all inbound packets on the port while normally forwarding outbound packets onit. Meanwhile, the device sends trap messages to the terminal, and deletes the corresponding MACaddress forwarding entry..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 default
