[c-nsp] ASR9000 SFP/XFP Input Error troubleshooting

[Curtis Piehler]

Hello all,

I was wondering if anyone could help me out with some Input Error
Troubleshooting.  This mostly pertains to XFPs.

I am using a mix of LR, SR and ER XFPs on my routers.  I notice the Input
Errors increment every now and again throughout the day.  It isn't
excessive but mostly like ones and twosies type thing.  I notice this more
on my PE routers' interface that connects to my P routers.

There are 0 Runts 0 Giants 0 Throttles 0 Parity 0 CRC 0 Frame 0 Overrun 0
Ignored 0 Abort just some regular old Input Errors.  The light levels
measured on each end of the devices are well within the Optic Threshold.  I
don't notice any packet loss from end to end over the the direct span.

Below is an example of a show controller stats on one of the XFPs that is
utilizing SR:

Statistics for interface TenGigE0/2/0/0 (cached values):

Ingress:
    Input total bytes           = 1306747860076739
    Input good bytes            = 1306747860076739

    Input total packets         = 1705370671687
    Input 802.1Q frames         = 0
    Input pause frames          = 0
    Input pkts 64 bytes         = 247950113768
    Input pkts 65-127 bytes     = 235546529699
    Input pkts 128-255 bytes    = 356869974054
    Input pkts 256-511 bytes    = 48710082541
    Input pkts 512-1023 bytes   = 34453174463
    Input pkts 1024-1518 bytes  = 539598267306
    Input pkts 1519-Max bytes   = 242242529856

    Input good pkts             = 1705370671687
    Input unicast pkts          = 1705359409225
    Input multicast pkts        = 11262462
    Input broadcast pkts        = 0

    Input drop overrun          = 0
    Input drop abort            = 0
    Input drop invalid VLAN     = 0
    Input drop invalid DMAC     = 0
    Input drop invalid encap    = 0
    Input drop other            = 0

    Input error giant           = 0
    Input error runt            = 0
    Input error jabbers         = 0
    Input error fragments       = 0
    Input error CRC             = 0
    Input error collisions      = 0
    Input error symbol          = 0
    Input error other           = 0

    Input MIB giant             = 242242529856
    Input MIB jabber            = 0
    Input MIB CRC               = 0

All of my physical interface MTUs are set for 9114.  The MIB Giants
increment but the Input Errors do not increment with them.

Thanks