H3C S5500-SI Series, Operation Manual

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signals; pin 3 and pin 6 are used for transmitting signals. To enable normal communication, you should
connect the local transmit pins to the remote receive pins. Therefore, you should configure the MDI
mode depending on the cable types.
z
Normally, the auto mode is recommended. The other two modes are useful only when the device
cannot determine the cable type.
z
When straight-through cables are used, the local MDI mode must be different from the remote MDI
mode.
z
When crossover cables are used, the local MDI mode must be the same as the remote MDI mode,
or the MDI mode of at least one end must be set to auto .
Follow these steps to configure the MDI mode for an Ethernet interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet interface view
interface interface-type
interface-number
—
Configure the MDI mode for the
Ethernet interface
mdi { across | auto | normal }
Optional
Defaults to auto . That is, the
Ethernet interface determines
the physical pin roles (transmit
or receive) through negotiation.
Testing the Cable on an Ethernet Interface
z
10-Gigabit Ethernet ports and optical interfaces of SFP ports do not support this feature.
z
A link in the up state goes down and then up automatically if you perform the operation described in
this section on one of the Ethernet interfaces forming the link.
Follow these steps to test the current operating state of the cable connected to an Ethernet interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet interface view
interface interface-type
interface-number
—
Test the cable connected to the
Ethernet interface once
virtual-cable-test Required
Configuring the Storm Constrain Function on an Ethernet Interface
The storm constrain function suppresses packet storms in an Ethernet. With this function enabled on an
interface, the system detects the multicast traffic, or broadcast traffic passing through the interface