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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
To set the statistics polling interval globally or on an Ethernet interface:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter Ethernet interface view.
interface interface-type
interface-number
N/A
3. 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, 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 types:
• Single-port loop—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 3.
• M
ulti-port loop—Occurs when a switch receives a packet that it sent out but the receiving interface
is not the sending interface. For example, as shown in Figure 4, w
hen Port 2 receives the packet sent
out of Port 1, a loop occurs between Port 1 and Port 2, and Port 2 is the looped port.
Figure 3 Single-port loop
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