H3C Technologies H3C SecBlade NetStream Cards - Manual (Page 71)

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• Null interface: A software-only virtual interface. A null interface is always up and can neither
forward data packets nor be configured with an IP address or any link layer protocol. With a null
interface specified as the next hop of a static route to a specific network segment, any packets
routed to the network segment are dropped. The null interface provides a simpler way to filter
packets than access control list (ACL). You can filter uninteresting traffic by transmitting it to a null
interface instead of applying an ACL.
General configuration
This section describes the attributes and configurations common to Layer 2 and Layer 3 Ethernet
interfaces or subinterfaces. For more information about the attributes and configuration, see
“ Configuring a Layer 2 Ethernet interface or subinterface ” and “ Configuring a Layer 3 Ethernet interface
or subinterface .”
Configuring a combo interface
Introduction to combo interfaces
A combo interface is a logical interface that comprises one optical (fiber) port and one electrical (copper)
port. The two ports share one forwarding interface, so they cannot work simultaneously. When you
enable either port, the other port is automatically disabled.
The fiber combo port and copper combo port share one interface view, in which you can activate the
fiber or copper port, and configure other port attributes such as the interface rate and duplex mode.
Configuration prerequisites
Before you configure combo interfaces, complete the following tasks:
• Find out the combo interfaces on your device by checking the product specifications and identify
the two physical interfaces that comprise each combo interface.
• Use the display interface command to find out which port (fiber or copper) of the combo interface
is active. If the output includes “Media type is twisted pair, Port hardware type is 1000_BASE_T”,
the copper combo port is active; if the output includes “Media type is not sure, Port hardware type
is No connector”, the fiber combo port is active.
Changing the active port of a combo interface
Follow these steps to change the active port of a combo interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter the Ethernet interface view
interface interface-type
interface-number
—
Activate the copper combo port or
fiber combo port
combo enable { copper | fiber }
Optional
By default, the copper combo port
is active.