[c-nsp] Output Packet drops on ethernet interface

[William Jackson]

Hi all

I have a 6509 10/100/1000 TX port facing a 10/100 on a 7204-vrx.

Both sides are hard coded to 100/Full and the link does not exhibit any layer 2 errors for this link yet on the 6509 side I am seeing many output drops.

And causing some packet loss, if I do a 5000 packet ping I get a dropped packet every 20 or so.

These are connected directly with a cat6 cable

6509 output

sh int gig 9/46
GigabitEthernet9/46 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is 0015.c761.3000 (bia 0015.c761.3000)
  Description: 
  Internet address is 
  MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 32/255, rxload 22/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:02, output 00:00:03, output hang never
  Last clearing of "show interface" counters 00:07:05
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 33255
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 8719000 bits/sec, 2929 packets/sec
  30 second output rate 12585000 bits/sec, 2842 packets/sec
  L2 Switched: ucast: 2037 pkt, 240423 bytes - mcast: 59 pkt, 7630 bytes
  L3 in Switched: ucast: 1080261 pkt, 404550799 bytes - mcast: 0 pkt, 0 bytes mcast
  L3 out Switched: ucast: 1074724 pkt, 578040580 bytes mcast: 0 pkt, 0 bytes
     1101559 packets input, 411802765 bytes, 0 no buffer
     Received 67 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     1062119 packets output, 569997724 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

7204 router
FastEthernet1/0 is up, line protocol is up 
  Hardware is i82543 (Livengood), address is 0005.9a69.d81c (bia 0005.9a69.d81c)
  Description: 
  Internet address is 
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, 
     reliability 255/255, txload 21/255, rxload 31/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:05:55
  Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 12159000 bits/sec, 2725 packets/sec
  30 second output rate 8507000 bits/sec, 2804 packets/sec
     922901 packets input, 488079048 bytes
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     957072 packets output, 353542000 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

Any ideas or things to check?