H3C Technologies H3C S10500 Series Switches - Manual (Page 23)

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NOTE:
For an Ethernet interface that belongs to a port group, if you set a traffic suppression threshold for the
interface in both Ethernet interface view and port group view, the threshold configured last takes effect.
Setting the statistics polling interval
Follow these steps to set the statistics polling interval globally or on an Ethernet interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet interface view
interface interface-type
interface-number
—
Set the statistics polling interval on
the Ethernet interface
flow-interval interval
Optional
The default interface statistics
polling interval is 300 seconds.
To display the interface statistics collected in the last polling interval, use the display interface command.
To clear interface statistics, use the reset counters interface command.
Enabling loopback detection on an Ethernet interface
If a switch receives a packet that it sent out, a loop has occurred to the switch. Loops might cause
broadcast storms, which degrade network performance. You can use this feature to detect whether a
loop has occurred.
Depending on whether the receiving interface is the same as the sending interface, loops fall into the
following type: single-port loopback and multi-port loopback.
• Single-port loopback occurs when an interface receives a packet that it sent out and the receiving
interface is the same as the sending interface, as shown in
Figure 4 .
• Multi-port loopback occurs when a switch receives a packet that it sent out but the receiving
interface might not be the sending interface, as shown in
Figure 5 .
Figure 4 Single-port loopback