Troubleshooting guide

11-22
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 11 Troubleshooting Layer 3 Network Connections
Troubleshooting Half- or Full-Duplex Negotiation
Switch# show controllers fastEthernet 3/0/0
IF Name: FastEthernet3/0/0
Port Status UP
Loopback Reg [3-0]|[7-4]: 0x8|0x8
Duplex/Speed Reg [3-0]|[7-4]: 0xFFF7|0x0
FPGA Rev : 3.8
Internal Reset Trigger Count: 0
Slicer registers
SMDR 0x0060 (Tx En,Rx En)
SSTR 0x1000
EVER 0x1704 (C1)
SSMR 0x4000 SIMR 0x0000 MBXW 0x0000 MBXR 0x0000
SPER 0xF000 GMUX VER 0xF000 MARKER 0x0000
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(Information Deleted)
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Half- and Full-Duplex Troubleshooting Commands
To troubleshoot half- and full-duplex negotiation problem, use the following commands:
Follow these steps to troubleshoot the half- and full-duplex negotiation problem on an interface:
Step 1 Use the show interfaces fastEthernet card/subcard/port command to check the half-duplex and
full-duplex autonegotiation configuration.
Switch# show interfaces fastEthernet 3/0/0
FastEthernet3/0/0 is up, line protocol is up
Hardware is epif_port, address is 0090.2156.d837 (bia 0090.2156.d837)
Internet address is 172.20.52.36/27
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto Speed, 100BaseTX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 1000 bits/sec, 2 packets/sec
33684 packets input, 11817561 bytes
Received 9 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 abort
0 watchdog, 33546 multicast
0 input packets with dribble condition detected
61232 packets output, 13584791 bytes, 0 underruns(0/0/0)
Command Purpose
show interfaces {fastethernet | gigabitethernet}
slot/subslot/port
Displays interface configuration, status, and
statistics.
show controllers {fastethernet | gigabitethernet}
slot/subslot/port
Displays controller status for the specified
interface.