Below is the sho int of the LAN and WAN interface of our 2811 (WAN) router. I'm seeing input errors and ignored increment at the same time on the LAN interface. I have hard coded speed and duplex on this interface and the core switch interface. You can see I cleared counters this morning, so what you see is less than a days worth. Now, the WAN circuit size is only 10 Mb and I'm also seeing output drops on that interface. Utilization has hit close to 100% a few times today so I would expect that, but I'm trying to decipher overruns, oversubscription from maybe a layer 1 issue somewhere.
LAN
FastEthernet0/0 is up, line protocol is up
Hardware is MV96340 Ethernet, address is 0023.33b8.5b20 (bia 0023.33b8.5b20)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 14/255, rxload 10/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 07:05:54
Input queue: 0/75/29812/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 4179000 bits/sec, 1147 packets/sec
5 minute output rate 5588000 bits/sec, 1111 packets/sec
23417003 packets input, 457914313 bytes
Received 215388 broadcasts, 0 runts, 0 giants, 950 throttles
38060 input errors, 0 CRC, 0 frame, 0 overrun, 38060 ignored
0 watchdog
0 input packets with dribble condition detected
24589901 packets output, 365544187 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
851 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
WAN
USHSBINYCNY01R1#show int fa0/2/0
FastEthernet0/2/0 is up, line protocol is up
Hardware is FastEthernet, address is e8b7.48a5.7283 (bia e8b7.48a5.7283)
Description: link to PE
MTU 1500 bytes, BW 10000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 151/255, rxload 112/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 07:14:29
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1909
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 4408000 bits/sec, 855 packets/sec
30 second output rate 5948000 bits/sec, 1049 packets/sec
19405395 packets input, 3564727991 bytes
Received 7 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
18290288 packets output, 4058721976 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
