[c-nsp] Cisco 9k TenGig interface Output drops

[Simon Allard]

Hi Guys

I have a Cisco 9k (IOS XR), out of the blue we have started to see output drops on one of our 10Gig interfaces, and we are stumped to why.

I have checked the QoS rules (show policy-map interface Te0/1/0/3) and I am not seeing any drops, and the interface is not showing any errors (other than the drop counter).

The interface is not close to saturation, as noted by the TX/RX load counters. (It's a 10Gig circuit).

Does anyone have any more ideas on where to check?

RP/0/RSP0/CPU0:AVL-9006-1#show interfaces Te0/1/0/3
Mon Jun  9 12:20:30.637 NST
TenGigE0/1/0/3 is up, line protocol is up
  Interface state transitions: 1
  Hardware is TenGigE, address is d867.d933.713b (bia d867.d933.713b)
  Layer 1 Transport Mode is LAN
  Description: To JAD-9006-1 Ten0/1/0/3 [cct description here]
  Internet address is 10.111.252.21/30
  MTU 9200 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)
     reliability 255/255, txload 71/255, rxload 17/255
  Encapsulation ARPA,
  Full-duplex, 10000Mb/s, LR, link type is force-up
  output flow control is off, input flow control is off
  loopback not set,
  ARP type ARPA, ARP timeout 04:00:00
  Last input 00:00:00, output 00:00:00
  Last clearing of "show interface" counters 2d04h
  30 second input rate 683789000 bits/sec, 246805 packets/sec
  30 second output rate 2800879000 bits/sec, 313047 packets/sec
     43078016592 packets input, 16596075514641 bytes, 170 total input drops
     0 drops for unrecognized upper-level protocol
     Received 0 broadcast packets, 43093 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     56873325966 packets output, 64034079075262 bytes, 3306387 total output drops
     Output 0 broadcast packets, 43123 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions



Cheers,
Simon