H3C Technologies H3C S10500 Series Switches - Manual (Page 17)

6
To do… Use the command… Remarks
Set a link-down event
suppression interval
link-delay delay-time
Required
Link-down event suppression is disabled by
default.
Configuring link-up event suppression
Follow these steps to configure link-up event suppression 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 a link-up event
suppression interval
link-delay delay-time mode up
Required
Link-up event suppression is disabled by
default.
NOTE:
The link-delay mode up command and the link-delay command supersedes each other, and whichever is
configured last takes effect.
Configuring loopback testing on an Ethernet interface
You can perform loopback testing on an Ethernet interface to determine whether the interface functions
properly. The Ethernet interface cannot forward data packets during the testing. Loopback testing falls
into the following categories:
• Internal loopback testing: As shown in Figure 1 , an interface in this mode (Port 2) returns a received
packet back to the switching chip. This function is used to identify whether a problem has occurred
on a network device, such as Switch A in the figure.
Figure 1 Internal loopback testing
• External loopback testing, or called “remote loopback testing.” As shown in Figure 2 , an interface
in this mode (Port 1) returns a received packet back to the packet sender. This function is used to
identify link failures between network devices.