Configuring The Interface Transmission And Speed Modes - Cisco CISCO7204VXR Installation And Configuration Manual

(sfp) for NPE-G2, RJ-45 (rj45) port.
Changing the Media Type of the Native Gigabit Ethernet GBIC or SFP or RJ-45 Ports
the media-type interface command:
media-type gbic | sfp | rj45
media-type rj45
end

Configuring the Interface Transmission and Speed Modes

Step 1
These commands are only applicable when using the RJ-45 media.
speed { 10 | 100 | 1000 | auto }
duplex { full | half | auto }
The following speed/duplex settings are supported:
media-type interface command to select the media type, either the GBIC (gbic) for NPE-G1 or SFP
1000 auto
duplex
1000 Mbps