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Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide
78-13983-04
Chapter 4 Configuring with the Command-Line Interface
Configuring Fast Ethernet Interfaces
Configuring Fast Ethernet Interfaces
To configure the FE interface of the MWR 1900, complete the following tasks:
• Configuring the FE Interface IP Address
• Setting the Speed and Duplex Mode
• Configuring Routing Protocol Attributes
• Configuring PIM
• Configuring HSRP Support
• Enabling the FE Interface
Configuring the FE Interface IP Address
To configure the FE interface, do the following starting in global configuration mode:
Step 1 Specify the port adapter type and the location of the interface to be configured.
Router(config)# interface fastethernet slot/port
The slot is always 0 and the port is the number of the port (0 or 1).
Step 2 Assign an IP address and subnet mask to the interface.
Router(config-if)# ip address ip_address subnet_mask
Setting the Speed and Duplex Mode
The Fast Ethernet ports of the MWR 1900 can run in full or half duplex mode and at 100 Mbps or 10
Mbps. The MWR 1900 also has an auto-negotiation feature that allows the router to negotiate the speed
and duplex mode with the corresponding interface on the other end of the connection.
Auto negotiation is the default setting for the speed and transmission mode.
When configuring an interface speed and duplex mode, note these guidelines:
• If both ends of the line support auto negotiation, we highly recommend the default auto negotiation
settings.
• When the auto negotiation is turned on for either speed or duplex, it auto negotiates both speed and
duplex.
• If one interface supports auto negotiation and the other end does not, configure duplex and speed on
both interfaces; do not use the auto setting on the supported side or the duplex setting will be half.