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Configuring the Ethernet Interface
Figure 13
GRP LEDs (Partial Front Panel View)
Configuring the Ethernet Interface
The IEEE 802.3 Ethernet interface, located on the GRP, allows connections to external Ethernet
networks and is capable of data transmission rates of 10 Mbps and 100 Mbps. At the auto-sensed data
transmission rate of 100 Mbps, the Ethernet port provides maximum usable bandwidth that is less than
100 Mbps; expect a maximum usable bandwidth of approximately 20 Mbps for either the MII or RJ-45
connection. Transmission speed, which is not user configurable, is determined by the network to which
the Ethernet interface is connected.
The Ethernet interface does not provide external routing functions; it is primarily designed as a Telnet
port into the GRP, and for booting and/or accessing Cisco IOS software images over a network to which
the Ethernet interface is directly connected.
An Ethernet port is used primarily as a Telnet port into the Cisco 12000 Series Router, or for booting
Caution
or accessing Cisco IOS software images over a network to which an Ethernet port is directly
connected. Cisco Express Forwarding (CEF) functions are switched off by default for security
reasons. Cisco strongly cautions you to consider the security implications of switching on CEF
routing functions on these ports.
The following sections provide two methods for configuring the Ethernet interface.
Configuring the Ethernet Interface
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