H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 119)

14-6
To do... Use the command... Remarks
Configure unknown unicast
storm suppression ratio unicast-suppression { ratio |
pps max-pps }
Optional
By default, all unknown unicast traffic is
allowed to pass through a port, that is,
unknown unicast traffic is not suppressed.
If you set storm suppression ratios in Ethernet port view or port group view repeatedly for an Ethernet
port that belongs to a port group, only the latest settings take effect.
Enabling Forwarding of Jumbo Frames
Due to tremendous amount of traffic occurring in Ethernet, it is likely that some frames might have a
frame size greater than the standard Ethernet frame size. By allowing such frames (called jumbo
frames) to pass through Ethernet ports, you can forward frames with a size greater than the standard
Ethernet frame size and yet still within the specified parameter range.
You can set the jumbo frame length in Ethernet port view or port group view.
z
If you set the jumbo frame length in Ethernet port view, the configuration takes effect only on the
current port.
z
If you set the jumbo frame length in port group view, the configuration takes effect on all ports in the
port group.
Follow these steps to enable the forwarding of jumbo frames:
To do... Use the command... Remarks
Enter system view system-view —
Enter port-group
port-group { manual
port-group-name | aggregation
agg-id }
Enter the
corresponding
view
Enter Ethernet
port view interface interface-type
interface-number
Use either approach.
Set the maximum frame length
allowed on an Ethernet port to
9212 bytes
jumboframe enable
By default, the maximum frame
length allowed on an Ethernet
port is 9212 bytes.
Enabling Loopback Detection on an Ethernet Port
Loop occurs when a port receives the packets that it sent out. Loops may cause broadcast storm. The
purpose of loopback detection is to detect loops on a port.
With loopback detection enabled on an Ethernet port, the device checks the port for external loopback
periodically. Once a loopback is detected on the port, the system does the following:
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If loops are detected on a port that is of access type, the port will be shutdown. Meanwhile, trap
messages will be sent to the terminal, and the corresponding MAC address forwarding entries will
be removed.