Cisco 1604 - Manual (Page 8)

3-8
Cisco IOS Dial Services Quick Configuration Guide
Chapter 3 Configuring the Cisco 1604 Router
Verifying the Ethernet Interface Configuration
Step 2 Bring up the interface. This command changes the state of the interface from administratively down to
up.
robo-austin(config-if)# no shutdown
Verifying the Ethernet Interface Configuration
To verify the Cisco 1604’s Ethernet interface configuration:
Step 1 Enter the show ip interface brief command, which enables you to quickly check the status of all router
interfaces.
The field “ administratively down ” means that the interface is configured with the shutdown
command.
Step 2 To bring the interface up, you must enter the no shutdown command. In the example below, the Status
column refers to the ability to physically connect the network at Layer 1—needed for getting clocks
(timing signals) and carrier signals. The Protocol column refers to the ability to see traffic flow, which
typically occurs at the data link layer. For example, the Ethernet interface sends a loopback Ethernet
packet out to itself through the Ethernet LAN:
robo-austin# show ip interface brief
Interface IP-Address OK? Method Status Protocol
BRI0 unassigned YES unset administratively down down
BRI0:1 unassigned YES unset administratively down down
BRI0:2 unassigned YES unset administratively down down
Ethernet0 10.1.4.1 YES manual up up
Serial0 unassigned YES unset administratively down down
In the next example, note that the status is up but the protocol is down. The following logging message
appears at 00:40:20: “
Unit 0, lost carrier. Transceiver problem? .” After the Ethernet cable is
plugged into the Ethernet port, the interface comes up. See 00:40:25.
robo-austin# show ip interface brief
Interface IP-Address OK? Method Status Protocol
BRI0 unassigned YES unset administratively down down
BRI0:1 unassigned YES unset administratively down down
BRI0:2 unassigned YES unset administratively down down
Ethernet0 10.1.4.1 YES manual up down
Serial0 unassigned YES unset administratively down down
robo-austin#
00:40:20 : %QUICC_ETHER-1-LOSTCARR: Unit 0, lost carrier. Transceiver problem?
00:40:25 : %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed sta
te to up
robo-austin#