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

[brad dreisbach]

> On May 14, 2015, at 21:04, Hank Nussbacher <hank at efes.iucc.ac.il> wrote:
> 
> 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.

https://supportforums.cisco.com/document/59721/asr9000xr-troubleshooting-packet-drops-and-understanding-np-drop-counters

> 
> Thanks,
> Hank
> 
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