Set the interval for collecting
statistics on the Ethernet port
Enabling Forwarding of Jumbo Frames
Due to tremendous amount of traffic occurring on an Ethernet port, it is likely that some frames greater
than 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, it
continues to process jumbo frames with a size greater than the standard Ethernet frame size and yet
within the specified parameter range.
In port configuration mode (Ethernet port view/port-group view), you can enable jumbo frames that can
pass through the Ethernet port.
If you execute the command in Ethernet port view, the configurations take effect only on the current
If you execute the command in port-group view, the configurations take effect on all ports in the port
Follow these steps to enable the forwarding of jumbo frames:
Enter system view
Enabling Loopback Detection on an Ethernet Port
If a port receives a packet that it sent out, a loop occurs. Loops may cause broadcast storms. The
purpose of loopback detection is to detect loops on a port.
When loopback detection is enabled on an Ethernet port, the device periodically checks whether the
ports have any external loopback. If it detects a loopback on a port, the device will set that port to be
under loopback detection mode.
If loops are detected on an access port, the port will be blocked. Meanwhile, trap messages will be
sent to the terminal, and the corresponding MAC address forwarding entries will be removed.
If loops are detected on a trunk port or a hybrid port, trap messages are sent to the terminal. If the
loopback detection control function is also enabled on the port, the port will be blocked, trap
messages will be sent to the terminal, and the corresponding MAC address forwarding entries will
Follow these steps to configure loopback detection:
In Ethernet port
Use the command...
Use the command...
By default, the interval for
collecting port statistics is 300
Use any command.
By default, the device
allows jumbo frames with
the length of 1.522 bytes to
pass through all Layer 2