Cisco 10720 Configuration Guide - Page 120

Basic Troubleshooting Ethernet for the Access Card Chapter 4 Troubleshooting 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Router# Use the show interfaces GigabitEthernet slot/port command to verify the configuration of a Gigabit Ethernet interface. Router# show interfaces GigabitEthernet 2/1 GigabitEthernet2/1 is up, line protocol is up Internet address is 195.16.1.1/16 MTU 9100 bytes, BW 1000000 Kbit, DLY 10 usec, rely 255/255, load 0/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex mode, link type is autonegotiation, media type is SX output flow-control is off, input flow-control is off ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:02, output 00:00:00, output hang never Last clearing of "show interface" counters 03:41:33 Queueing strategy: PXF First-In-First-Out Output queue 0/8192, 0 drops; input queue 0/75, 0 drops 30 second input rate 0 bits/sec, 0 packets/sec 30 second output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 1 packets output, 64 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out Router# FastEthernet/GigabitEthernet Is up If the interface is down, check the following conditions: • The cable is fully connected. • The cable is bent or damaged. If the cable is bent or damaged, the signal will be degraded. • A hardware failure has not occurred. Observe the LEDs or use the show commands to determine if a failure has occurred. If the hardware has failed, replace the card or cable. • If the interface is administratively down, use the no shutdown command to enable the interface. See the "Verifying Interface Configuration" section on page 4-19 for an example output that shows interface status. Line Protocol Is up Check to see if the status is line protocol is up, in the first line of the output; see the "Verifying Interface Configuration" section on page 4-19. The status of the interface follows the slot/port configuration: • The line protocol software processes determine that the line is unusable. Swap the cable. • Check local or remote interface for misconfiguration. • Swap interface module when there is a hardware failure. 4-20 Cisco 10720 Internet Router Installation and Configuration Guide 78-13062-10