mac

Commands for Network Port Configuration
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can be active at a time, and only this port can send and receive data normally. For the
determination of the 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
Note:
1. Combo port is a conception involving the physical layer and the LLC sublayer of the
datalink layer. The status of a combo port will not affect any operation in the MAC
sublayer of the datalink layer and upper layers. If the bandwidth limit for a combo port is
1Mbps, then this 1Mbps applies to the active port of this combo port, regardless of the
port type being copper or fiber.
2. If a combo port connects to another combo port, it is recommended for both parties to
use the forced copper or the forced fiber mode.
3. Run show interface under Admin Mode to check for the active port of a combo
port .The following result indicates if the active port for a combo port is the fiber (or
copper) cable port: Hardware is Gigabit-combo, active is fiber (or copper)
Example: Setting ports 1/21-24 to the forced fiber mode.
Switch(config)#interface ethernet 1/21-24
Switch(Config-Port-Range)#media-type fiber
3.1.9 negotiation
Command: negotiation {on | off}
Function: Enables/Disables the auto-negotiation function of a 1000Base-FX port.
Parameters: on: enables the auto-negotiation; off: disable the auto-negotiation.
Command mode: Port configuration Mode.
Default: Auto-negotiation is enabled by default.
Usage Guide: This command applies to 1000Base-FX interface only. The negotiation
command is not available for 1000Base-TX or 100Base-TX interface. For combo port,
this command applies to the 1000Base-FX port only but has no effect on the
1000Base-TX port. To change the negotiation mode, speed and duplex mode of
1000Base-TX port, use speed-duplex command instead.
Example: Port 21 of Switch1 is connected to port 21 of Switch2, the following will disable
the negotiation for both ports.
Switch1(config)#interface ethernet1/21
Switch1(Config-If-Ethernet1/21)#negotiation off
Switch2(config)#interface ethernet1/21
Switch2(Config-If-Ethernet1/21)#negotiation off