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Command mode: Interface Mode
Default: The default setting for combo mode of combo ports is fiber cable port first.
Usage Guide: The combo mode of combo ports and the port connection condition
determines the active port of the combo ports. A combo port consists of one fiber port and
a copper cable port. It should be noted that the speed-duplex command applies to the
copper cable port while the negotiation command applies to the fiber cable port, so they
will not conflict. Only one of the fiber cable port or the copper cable port of the same
combo port can be active at a time. Only the active port can send and receive data
normally.
For the determination of active port in a combo port, see the table below. The headline row
in the table indicates the combo mode of the combo port, while the first column indicates
the connection conditions of the combo port, in which “connected” refers to a good
connection of fiber cable port or copper cable port to the other devices.
Copper
forced
Copper
preferred
SFP forced
SFP
preferred
Fiber connected,
copper not connected
Copper
cable port
Fiber cable
port
Fiber cable
port
Fiber cable
port
Copper connected,
fiber not connected
Copper
cable port
Copper
cable port
Fiber cable
port
Copper
cable port
Both fiber and copper
are connected
Copper
cable port
Copper
cable port
Fiber cable
port
Fiber cable
port
None of fiber and
copper are
connected
Copper
cable port
Fiber cable
port
Fiber cable
port
Fiber cable
port
Note:
& Combo port is a conception involving physical layer and the LLC sublayer of datalink
layer. The status of combo port will not affect any operation in the MAC sublayer of
datalink layer and upper layers. If the bandwidth limit for a combo port is 1 Mb, then
this 1 Mb applies to the active port of this combo port, regardless of the port type
being copper or fiber.
& If a combo port connects to another combo port, it is recommended for both parties to
use copper- or fiber-forced mode.
& Run “show interfaces status” under Admin Mode to check for the active port of a
combo port The following result indicates the active port for a combo port is the fiber
cable port (or copper cable port): Hardware is Gigabit-combo, active is fiber (copper).
Example: Set Port 1/25 -28 to fiber-forced.
Switch(Config)#interface ethernet 1/25-28
Switch(Config-Port-Range)#combo-forced-mode sfp-forced