We recently installed a WS-C3750-48TS-E and loaded the newest Enterprise IOS image on it.
There are a few trunks configured on the switch and there are also about 10 servers connected to it. We periodically get flashing amber lights on only the server ports. Errors occur occasionally on these ports. I have included the controller output of one of the periodic blinking amber ports below.
I opened up a TAC case, but the tech was less than helpful. He quoted the following bug, but this is definitely not the problem.
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CSCec14238
Externally found moderate defect: Verified (V)
3750 connected using dot1q cause Runts increase on interface.
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The Catalyst 3750 documentation states that ports should only blink amber if "the port is blocked by STP and is transmitting or receiving packets". Well, we have "switchport host" issued on each of the server ports with BPDU guard and BPDU filter enabled. I know that the STP port state never changes, so I know this is not the problem. We never lose connectivity to the server when its port is blinking amber.
There are only 2 possibilities that I can think of:
1) The documentation is incorrect - the port blinks amber if there are errors
2) There is a cosmetic bug
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aus-core1#show controllers ethernet-controller fast 1/0/38
Transmit FastEthernet1/0/38 Receive
2470495362 Bytes 1518647103 Bytes
24502910 Unicast frames 32513196 Unicast frames
749706 Multicast frames 0 Multicast frames
2956574 Broadcast frames 2608 Broadcast frames
0 Too old frames 1518187216 Unicast bytes
0 Deferred frames 0 Multicast bytes
0 MTU exceeded frames 319302 Broadcast bytes
0 1 collision frames 456 Alignment errors
0 2 collision frames 0 FCS errors
0 3 collision frames 0 Oversize frames
0 4 collision frames 0 Undersize frames
0 5 collision frames 73 Collision fragments
0 6 collision frames
0 7 collision frames 2935484 Minimum size frames
0 8 collision frames 7232091 65 to 127 byte frames
0 9 collision frames 1820568 128 to 255 byte frames
0 10 collision frames 1355735 256 to 511 byte frames
0 11 collision frames 1379397 512 to 1023 byte frames
0 12 collision frames 17792985 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 73 Invalid frames, too small
15990751 64 byte frames 0 Valid frames, too small
6453030 127 byte frames
1092956 255 byte frames 0 Too old frames
1234441 511 byte frames 0 Valid oversize frames
551685 1023 byte frames 0 System FCS error frames
2886327 1518 byte frames 0 RxPortFifoFull drop frame
0 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames
Receive
1518647103 Bytes
32513196 Unicast frames
0 Multicast frames
2608 Broadcast frames
1518187216 Unicast bytes
0 Multicast bytes
319302 Broadcast bytes
456 Alignment errors
0 FCS errors
0 Oversize frames
0 Undersize frames
73 Collision fragments
2935484 Minimum size frames
7232091 65 to 127 byte frames
1820568 128 to 255 byte frames
1355735 256 to 511 byte frames
1379397 512 to 1023 byte frames
17792985 1024 to 1518 byte frames
0 Overrun frames
0 Pause frames
0 Symbol error frames
0 Invalid frames, too large
0 Valid frames, too large
73 Invalid frames, too small
0 Valid frames, too small
0 Too old frames
0 Valid oversize frames
0 System FCS error frames
0 RxPortFifoFull drop frame
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Can anyone offer any advise or suggestions?
Thanks,
Jordan
