I have a certain number of packets droped on my 10gb/s interface, on Cisco 6500 with Sup 720. You can see underneath the number of dropped packet within a minute, after I cleared the counters.
We don't see any performance degradation, and none of our customers complained. Is this going to be a serious problem in future? I've never seen a single packet in the queue. I'm considering changing the input queue size to 1024 because it is 75 packet in the queue by default, but I'm wondering why packets don't enter in the queue at all before being dropped. On 1gb/s interfaces I don't see any dropped packets at all and everything is fine. Please help me resolve the problem with packet drops.
sh int TenGigabitEthernet1/1 Hardware is C6k 10000Mb 802.3, address is 000f.3589.ac00 (bia 000f.3589.ac00) Description: transit Internet address is MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec, reliability 255/255, txload 84/255, rxload 3/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 10Gb/s input flow-control is off, output flow-control is off ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:01, output hang never Last clearing of "show interface" counters 00:00:40 Input queue: 0/75/8097/0 (size/max/drops/flushes); Total output drops: 0 <----- ^^^^ Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 138646000 bits/sec, 99380 packets/sec 5 minute output rate 3321988000 bits/sec, 329345 packets/sec L2 Switched: ucast: 158 pkt, 51401 bytes - mcast: 0 pkt, 0 bytes L3 in Switched: ucast: 4120795 pkt, 695621509 bytes - mcast: 0 pkt, 0 bytes mcast L3 out Switched: ucast: 13774697 pkt, 17424995312 bytes mcast: 0 pkt, 0 bytes 3484933 packets input, 608041136 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 40 giants, 0 throttles 8097 input errors, 7120 CRC, 894 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 0 input packets with dribble condition detected 11742838 packets output, 14837984934 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 PAUSE output 0 output buffer failures, 0 output buffers swapped out