[c-nsp] IOS-XR and interface discards (input)

[Hank Nussbacher]

We have an ASR 9010 running IOS-XR v 5.1.3.  We see a high level of input 
discards:

TenGigE0/1/1/7 is up, line protocol is up
   Interface state transitions: 25
   Layer 1 Transport Mode is WAN
   MTU 9028 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)
      reliability 255/255, txload 13/255, rxload 99/255
   Encapsulation ARPA,
   Full-duplex, 10000Mb/s, link type is force-up
   output flow control is on, input flow control is on
   Carrier delay (up) is 100 msec, Carrier delay (down) is 4000 msec
   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 1d13h
   30 second input rate 3886868000 bits/sec, 392410 packets/sec
   30 second output rate 527057000 bits/sec, 154557 packets/sec
      55223825999 packets input, 63505398737673 bytes, 116320028 total 
input drops
      0 drops for unrecognized upper-level protocol
      Received 111 broadcast packets, 1499584 multicast packets
               0 runts, 0 giants, 0 throttles, 0 parity
      10 input errors, 5 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

The config on the interface looks like this:

interface TenGigE0/1/1/7
  mtu 9028
  ipv4 unreachables disable
  ipv6 nd dad attempts 5
  ipv6 address 2001:798:28:20aa::6/126
  monitor-session No1 ethernet
  flow-control bidirectional
  carrier-delay up 100 down 4000
  load-interval 30
  flow ipv4 monitor fmp-nfsen sampler fsm-nfsen ingress
  transport-mode wan
  ipv4 access-group catch13-ing ingress
!

Any clue would be helpful for us to begin to debug this issue.

Thanks,
Hank