Anndd you're both correct. To

Barry · ‎05-21-2014

Platform is a WS-C2960-48TC-L. Began by troubleshooting CRC errors on our COO's drop. Interface configuration is a Fa port that was forced 100 Full. He was still getting errors after I replaced both the drop and patch cord. To rule out premise wiring I patched him to a port on another switch and he was functional again.

I'm currently duplicating the issue on a test machine on the same problematic port(0/44); however, I'm noticing 3 blocks of 3 other ports that are also showing errors. Configurations are also forced 100 Full on these as well. See output below.

The three blocks of three interfaces had me thinking it may be isolated to an ASIC, but I didn't find any correlation.

Am I dealing with a switch that is about to fail ??

interface gid gpn lpn asic hw-i flags sp dp bundle vlan mvid mac so_di i_vlan
-----------------------------------------------------------------------------
Fa0/1 1 1 1 0 2 D 0 0 no 0 0 0 61441 0
Fa0/2 2 2 2 0 3 U 2 2 no 0 0 0 61442 0
Fa0/3 3 3 3 0 4 D 0 0 no 0 0 0 61443 0
Fa0/4 4 4 4 0 5 U 2 2 no 0 0 0 61444 0
Fa0/5 5 5 5 0 6 U 2 2 no 0 0 0 61445 0
Fa0/6 6 6 6 0 7 D 0 0 no 0 0 0 61446 0
Fa0/7 7 7 7 0 8 D 0 0 no 0 0 0 61447 0
Fa0/8 8 8 8 0 9 D 0 0 no 0 0 0 61448 0
Fa0/9 9 9 9 0 10 D 0 0 no 0 0 0 61449 0
Fa0/10 10 10 10 0 11 D 0 0 no 0 0 0 61450 0
Fa0/11 11 11 11 0 12 D 0 0 no 0 0 0 61451 0
Fa0/12 12 12 12 0 13 D 0 0 no 0 0 0 61452 0
Fa0/13 13 13 13 0 14 D 0 0 no 0 0 0 61453 0
Fa0/14 14 14 14 0 15 D 0 0 no 0 0 0 61454 0
Fa0/15 15 15 15 0 16 D 0 0 no 0 0 0 61455 0
Fa0/16 16 16 16 0 17 U 2 2 no 0 0 0 61456 0
Fa0/17 17 17 17 0 18 U 2 2 no 0 0 0 61457 0
Fa0/18 18 18 18 0 19 U 2 2 no 0 0 0 61458 0
Fa0/19 19 19 19 0 20 D 0 0 no 0 0 0 61459 0
Fa0/20 20 20 20 0 21 D 0 0 no 0 0 0 61460 0
Fa0/21 21 21 21 0 22 D 0 0 no 0 0 0 61461 0
Fa0/22 22 22 22 0 23 D 0 0 no 0 0 0 61462 0
Fa0/23 23 23 23 0 24 D 0 0 no 0 0 0 61463 0
Fa0/24 24 24 24 0 25 D 0 0 no 0 0 0 61464 0
Fa0/25 25 25 25 1 2 U 2 2 no 0 0 0 61465 0
Fa0/26 26 26 26 1 3 U 2 2 no 0 0 0 61466 0
Fa0/27 27 27 27 1 4 D 0 0 no 0 0 0 61467 0
Fa0/28 28 28 28 1 5 U 2 2 no 0 0 0 61468 0
Fa0/29 29 29 29 1 6 U 2 2 no 0 0 0 61469 0
Fa0/30 30 30 30 1 7 U 2 2 no 0 0 0 61470 0
Fa0/31 31 31 31 1 8 U 2 2 no 0 0 0 61471 0
Fa0/32 32 32 32 1 9 U 2 2 no 0 0 0 61472 0
Fa0/33 33 33 33 1 10 U 2 2 no 0 0 0 61473 0
Fa0/34 34 34 34 1 11 D 0 0 no 0 0 0 61474 0
Fa0/35 35 35 35 1 12 U 2 2 no 0 0 0 61475 0
Fa0/36 36 36 36 1 13 U 2 2 no 0 0 0 61476 0

interface gid gpn lpn asic hw-i flags sp dp bundle vlan mvid mac so_di i_vlan
-----------------------------------------------------------------------------
Fa0/37 37 37 37 1 14 D 0 0 no 0 0 0 61477 0
Fa0/38 38 38 38 1 15 U 2 2 no 0 0 0 61478 0
Fa0/39 39 39 39 1 16 U 2 2 no 0 0 0 61479 0
Fa0/40 40 40 40 1 17 U 2 2 no 0 0 0 61480 0
Fa0/41 41 41 41 1 18 U 2 2 no 0 0 0 61481 0
Fa0/42 42 42 42 1 19 D 0 0 no 0 0 0 61482 0
Fa0/43 43 43 43 1 20 U 2 2 no 0 0 0 61483 0
Fa0/44 44 44 44 1 21 U 2 2 no 0 0 0 61484 0
Fa0/45 45 45 45 1 22 U 2 2 no 0 0 0 61485 0
Fa0/46 46 46 46 1 23 D 0 0 no 0 0 0 61486 0
Fa0/47 47 47 47 1 24 D 0 0 no 0 0 0 61487 0
Fa0/48 48 48 48 1 25 D 0 0 no 0 0 0 61488 0
Gi0/1 49 49 49 1 1 D 0 0 no 0 0 0 61489 0
Gi0/2 50 50 50 1 0 U 3 2 no 0 0 0 61490 0
Po1 56 56 0 0 0 D 0 0 no 0 0 0 61496 0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
Fa0/1 0 0 0 0 0 0
Fa0/2 0 1763 0 1763 0 1224
Fa0/3 0 0 0 0 0 0
Fa0/4 0 2664 0 2664 0 439
Fa0/5 0 4479 0 4479 0 1005
Fa0/6 0 0 0 0 0 0
Fa0/7 0 0 0 0 0 0
Fa0/8 0 0 0 0 0 0
Fa0/9 0 0 0 0 0 0
Fa0/10 0 0 0 0 0 0
Fa0/11 0 0 0 0 0 0
Fa0/12 0 0 0 0 0 0
Fa0/13 0 0 0 0 0 0
Fa0/14 0 0 0 0 0 0
Fa0/15 0 0 0 0 0 0
Fa0/16 0 16 0 16 0 320
Fa0/17 0 6507 0 6507 0 77
Fa0/18 0 2853 0 2853 0 379
Fa0/19 0 0 0 0 0 0
Fa0/20 0 0 0 0 0 0
Fa0/21 0 0 0 0 0 0
Fa0/22 0 0 0 0 0 0
Fa0/23 0 0 0 0 0 0
Fa0/24 0 0 0 0 0 0
Fa0/25 0 0 0 0 0 180
Fa0/26 0 0 0 0 0 29533
Fa0/27 0 0 0 0 0 0
Fa0/28 0 0 0 0 0 4955
Fa0/29 0 0 0 0 0 2326
Fa0/30 0 0 0 0 0 523
Fa0/31 0 0 0 0 0 5274
Fa0/32 0 0 0 0 0 54
Fa0/33 0 0 0 0 0 793
Fa0/34 0 0 0 0 0 0
Fa0/35 0 0 0 0 0 4504
Fa0/36 0 0 0 0 0 266
Fa0/37 0 0 0 0 0 0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
Fa0/38 0 0 0 0 0 0
Fa0/39 0 0 0 0 0 310
Fa0/40 0 0 0 0 0 2281
Fa0/41 0 0 0 0 0 579
Fa0/42 0 0 0 0 0 0
Fa0/43 0 1494 0 1494 0 1544
Fa0/44 1554 1760 0 3314 0 0
Fa0/45 0 3349 0 3349 0 513
Fa0/46 0 0 0 0 0 0
Fa0/47 0 0 0 0 0 0
Fa0/48 0 0 0 0 0 0
Gi0/1 0 0 0 0 0 0
Gi0/2 0 0 0 0 0 0
Po1 0 0 0 0 0 0

Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giants
Fa0/1 0 0 0 0 0 0 0
Fa0/2 0 0 0 0 0 0 0
Fa0/3 0 0 0 0 0 0 0
Fa0/4 0 0 0 0 0 0 0
Fa0/5 0 0 0 0 0 0 0
Fa0/6 0 0 0 0 0 0 0
Fa0/7 0 0 0 0 0 0 0
Fa0/8 0 0 0 0 0 0 0
Fa0/9 0 0 0 0 0 0 0
Fa0/10 0 0 0 0 0 0 0
Fa0/11 0 0 0 0 0 0 0
Fa0/12 0 0 0 0 0 0 0
Fa0/13 0 0 0 0 0 0 0
Fa0/14 0 0 0 0 0 0 0
Fa0/15 0 0 0 0 0 0 0
Fa0/16 0 0 0 0 0 0 0
Fa0/17 0 0 0 0 0 0 0
Fa0/18 0 0 0 0 0 0 0
Fa0/19 0 0 0 0 0 0 0
Fa0/20 0 0 0 0 0 0 0
Fa0/21 0 0 0 0 0 0 0
Fa0/22 0 0 0 0 0 0 0
Fa0/23 0 0 0 0 0 0 0

Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giants
Fa0/24 0 0 0 0 0 0 0
Fa0/25 0 0 0 0 0 0 0
Fa0/26 0 0 0 0 0 0 0
Fa0/27 0 0 0 0 0 0 0
Fa0/28 0 0 0 0 0 0 0
Fa0/29 0 0 0 0 0 0 0
Fa0/30 0 0 0 0 0 0 0
Fa0/31 0 0 0 0 0 0 0
Fa0/32 0 0 0 0 0 0 0
Fa0/33 0 0 0 0 0 0 0
Fa0/34 0 0 0 0 0 0 0
Fa0/35 0 0 0 0 0 0 0
Fa0/36 0 0 0 0 0 0 0
Fa0/37 0 0 0 0 0 0 0
Fa0/38 0 0 0 0 0 0 0
Fa0/39 0 0 0 0 0 0 0
Fa0/40 0 0 0 0 0 0 0
Fa0/41 0 0 0 0 0 0 0
Fa0/42 0 0 0 0 0 0 0
Fa0/43 0 0 0 0 0 0 0
Fa0/44 0 0 0 0 0 0 0
Fa0/45 0 0 0 0 0 0 0
Fa0/46 0 0 0 0 0 0 0
Fa0/47 0 0 0 0 0 0 0
Fa0/48 0 0 0 0 0 0 0
Gi0/1 0 0 0 0 0 0 0
Gi0/2 0 0 0 0 0 0 0
Po1 0 0 0 0 0 0 0

NDCRP0201#sh run int fa0/2
Building configuration...

Current configuration : 127 bytes
!
interface FastEthernet0/2
description -2D-
switchport access vlan 636
switchport mode access
speed 100
duplex full
end

NDCRP0201#sh run int fa0/4
Building configuration...

Current configuration : 127 bytes
!
interface FastEthernet0/4
description -4D-
switchport access vlan 636
switchport mode access
speed 100
duplex full
end

NDCRP0201#sh run int fa0/5
Building configuration...

Current configuration : 127 bytes
!
interface FastEthernet0/5
description -5D-
switchport access vlan 636
switchport mode access
speed 100
duplex full
end

NDCRP0201#sh run int fa0/16
Building configuration...

Current configuration : 153 bytes
!
interface FastEthernet0/16
description -16D-
switchport access vlan 634
switchport mode access
speed 100
duplex full
spanning-tree portfast
end

NDCRP0201#sh run int fa0/17
Building configuration...

Current configuration : 153 bytes
!
interface FastEthernet0/17
description -17D-
switchport access vlan 634
switchport mode access
speed 100
duplex full
spanning-tree portfast
end

NDCRP0201#sh run int fa0/18
Building configuration...

Current configuration : 153 bytes
!
interface FastEthernet0/18
description -18D-
switchport access vlan 634
switchport mode access
speed 100
duplex full
spanning-tree portfast
end

NDCRP0201#sh run int fa0/43
Building configuration...

Current configuration : 153 bytes
!
interface FastEthernet0/43
description -43D-
switchport access vlan 633
switchport mode access
speed 100
duplex full
spanning-tree portfast
end

NDCRP0201#sh run int fa0/44
Building configuration...

Current configuration : 153 bytes
!
interface FastEthernet0/44
description -44D-
switchport access vlan 635
switchport mode access
speed 100
duplex full
spanning-tree portfast
end

NDCRP0201#sh run int fa0/45
Building configuration...

Current configuration : 153 bytes
!
interface FastEthernet0/45
description -45D-
switchport access vlan 636
switchport mode access
speed 100
duplex full
spanning-tree portfast
end

NDCRP0201#sh int fa0/44 controller
FastEthernet0/44 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0022.911c.482c (bia 0022.911c.482c)
Description: -44D-
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)
Full-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters 01:26:43
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 183000 bits/sec, 1 packets/sec
239630 packets input, 52089210 bytes, 0 no buffer
Received 1268 broadcasts (448 multicasts)
0 runts, 0 giants, 0 throttles
3314 input errors, 1760 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 448 multicast, 0 pause input
0 input packets with dribble condition detected
312314 packets output, 358696369 bytes, 0 underruns
0 output errors, 0 collisions, 2 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

Transmit FastEthernet0/44 Receive
4047044964 Bytes 320976459 Bytes
3548826 Unicast frames 2145333 Unicast frames
38160 Multicast frames 8884 Multicast frames
86655 Broadcast frames 11375 Broadcast frames
0 Too old frames 306339450 Unicast bytes
0 Deferred frames 3030596 Multicast bytes
0 MTU exceeded frames 1111268 Broadcast bytes
0 1 collision frames 1554 Alignment errors
0 2 collision frames 16884 FCS errors
0 3 collision frames 0 Oversize frames
0 4 collision frames 0 Undersize frames
0 5 collision frames 719467 Collision fragments
0 6 collision frames
0 7 collision frames 1457580 Minimum size frames
0 8 collision frames 183263 65 to 127 byte frames
0 9 collision frames 336415 128 to 255 byte frames
0 10 collision frames 99274 256 to 511 byte frames
0 11 collision frames 39884 512 to 1023 byte frames
0 12 collision frames 67614 1024 to 1518 byte frames
0 13 collision frames 0 Overrun frames
0 14 collision frames 0 Pause frames
0 15 collision frames
0 Excessive collisions 0 Symbol error frames
0 Late collisions 0 Invalid frames, too large
0 VLAN discard frames 0 Valid frames, too large
0 Excess defer frames 719467 Invalid frames, too small
125085 64 byte frames 0 Valid frames, too small
107105 127 byte frames
282375 255 byte frames 0 Too old frames
153304 511 byte frames 0 Valid oversize frames
64399 1023 byte frames 0 System FCS error frames
2941373 1518 byte frames 0 RxPortFifoFull drop frame
0 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames

Leo Laohoo · ‎05-21-2014

The line errors are caused by the "Collision fragments". Collision fragments commonly occurs when you hard-code the speed and duplex settings of an interface.

Barry · ‎05-21-2014

The other ports that other users machines are on are all configured at 100 Full. I do this to avoid half-duplex negotiations. Additionally, the functional port that I moved him to on our other switch is forced 100 Full and is non-erroneous. I can also duplicate the issue with different NIC hardware on the machine side.

Leo Laohoo · ‎05-21-2014

Ok, so try this.

1. Clear the counters;

2. The set interface to auto-duplex/auto-speed;

3. Ensure the PC's NIC is also auto/auto.

Barry · ‎05-22-2014

It does function without error when I configure in the manner you suggested. I've always forced on the switch and utilized a-duplex and a-speed on client side to prevent half duplex negotiations. This is the first instance where the client side has negotiated half duplex. Strangely enough when I move them to the other switch (a 3560) the client side doesn't negotiate half on that switch.

Leo Laohoo · ‎05-22-2014

Forgot to mention that you can use the command "speed auto 100".

glen.grant · ‎05-21-2014

My guess is your COO's nic card is set as auto for speed and duplex and you have the switchport hardcoded. Can't do that , that's causes all kinds of errors and slowness on the ports. Both the switchport and the nic card settings must match. These days unless you are having a specific problem with a given nic everything should be left as auto .

Barry · ‎05-21-2014

The other ports that other users machines are on are all configured at 100 Full. I do this to avoid half-duplex negotiations. Additionally, the functional port that I moved him to on our other switch is forced 100 Full and is non-erroneous. I can also duplicate the issue with different NIC hardware on the machine side.

Barry · ‎05-21-2014

Anndd you're both correct. To rule it out I forced 100 Full client side. Errors disappeared. So it seems that I'm dammed either way. What is the best way to prevent half-duplex negotiations happening when you can't force on the client side ? This is the first instance I've ran into where this occurred on the system side instead of the switch side.

Switchport issues. Possibly a failing unit?