we are seeing a very high number of "input errors" on our cisco switches. These errors only occur under heavy load (like backups) and only appear on the interfaces between src and dest ports involved with the backup process.
I know a number of errors is to be expected during bursting on these interfaces, but it seems that the error counts we are seeing are quite extensive.
common causes of this i know can be autoneg for speed and duplex, but would this not constantly error, not just under heavy load?
All of the interfaces are connected to HP proliant servers with NICs in a variety of modes (Teamed TLB, Teamed NFT, and un-teamed) and patch cables have been checked and swapped yet still the issue persists.
I am planning to test a few interfaces by hardcoding the speed/duplex, but wonder if anyone else has seen this sort of behaviour and has any ideas what i can do to resolve.
the switches are 4500s, servers HP Proliants, and ports are configured as follows:
#sh run int gi3/31
Current configuration : 112 bytes
switchport access vlan 11
switchport mode access
#sh int gi3/31
GigabitEthernet3/31 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet Port, address is 0012.430d.505e (bia 0012.430d.505e)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 80/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2339315
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 316568000 bits/sec, 26290 packets/sec
5 minute output rate 6324000 bits/sec, 10104 packets/sec
2110384561 packets input, 2144877692248 bytes, 0 no buffer
Received 8456236 broadcasts (3272658 multicast)
0 runts, 0 giants, 0 throttles
103139 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
3498749824 packets output, 1651942536917 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 output buffer failures, 0 output buffers swapped out
thanks for your time!