Hello.
I have strange tx drops on gi ports of cat 2960. All ports have small transfer rates. Errors look strange and inexplicable. What is the possible reason?
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 50 WS-C2960S-48TS-S 12.2(58)SE C2960S-UNIVERSALK9-M
sh int gi0/1 controller
GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is dc7b.94b7.9c01 (bia dc7b.94b7.9c01)
Description: trunk
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 4/255, rxload 6/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:16, output 00:00:00, output hang never
Last clearing of "show interface" counters 06:52:13
Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 2828
Queueing strategy: fifo
Output queue: 0/4096 (size/max)
5 minute input rate 24862000 bits/sec, 8752 packets/sec
5 minute output rate 18520000 bits/sec, 4672 packets/sec
246908278 packets input, 65467325427 bytes, 0 no buffer
Received 213948 broadcasts (117704 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 117704 multicast, 0 pause input
0 input packets with dribble condition detected
142702266 packets output, 84278358054 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
820 unknown protocol drops
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 GigabitEthernet0/1 Receive
1498118500 Bytes 2527123071 Bytes
715192093 Unicast frames 1231007062 Unicast frames
926287 Multicast frames 1073674 Multicast frames
4262 Broadcast frames 904655 Broadcast frames
0 Too old frames 2313965628 Unicast bytes
0 Deferred frames 79012047 Multicast bytes
0 MTU exceeded frames 82825789 Broadcast bytes
0 1 collision frames 0 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 0 Collision fragments
0 6 collision frames
0 7 collision frames 1075799 Minimum size frames
0 8 collision frames 646043936 65 to 127 byte frames
0 9 collision frames 310520183 128 to 255 byte frames
0 10 collision frames 71221231 256 to 511 byte frames
0 11 collision frames 53776772 512 to 1023 byte frames
0 12 collision frames 150328405 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 19065 Valid frames, too large
0 Excess defer frames 0 Invalid frames, too small
1048624 64 byte frames 0 Valid frames, too small
369803960 127 byte frames
121338068 255 byte frames 0 Too old frames
51240107 511 byte frames 0 Valid oversize frames
27503328 1023 byte frames 0 System FCS error frames
145173196 1518 byte frames 0 RxPortFifoFull drop frame
15359 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames
