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XR12K T3 Ships Interface Statistics Even If Admin Down

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On the XR12K due to the design of the T3 SPA if the controller and interface are admin down we will continue sending statistics. This can happen if the other side is still up and sending frames.

There is no workaround for this issue and it does not cause any impact on the system.

In the outputs below we can see that both the controller and interface are admin down, yet the input errors are incrementing (while last input doesn't change) as runts.

RP/0/7/CPU0:xr12k#show int se0/1/0/3
Mon Sep 21 16:04:35.252 UTC
Serial0/1/0/3 is administratively down, line protocol is administratively down
  Interface state transitions: 2
  Hardware is Serial network interface(s)
  Internet address is Unknown
  MTU 4474 bytes, BW 44210 Kbit (Max: 44210 Kbit)
     reliability 109/255, txload 0/255, rxload 0/255
  Encapsulation FRAME-RELAY, crc 32,
  Scrambling is disabled,  Invert data is disabled
  LMI enq sent  0, LMI stat recvd 0, LMI upd recvd 0
  LMI enq recvd 0, LMI stat sent  0, LMI upd sent  0 , DCE LMI down
  LMI DLCI 1023  LMI type is CISCO  frame relay DCE
  Last input 5d00h, output never
 Last clearing of "show interface" counters 00:21:46

  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 92325 total input drops
     0 drops for unrecognized upper-level protocol
     Received 92325 runts, 0 giants, 0 throttles, 0 parity
     92325 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 total output drops
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out

RP/0/7/CPU0:xr12k#show int se0/1/0/3 | inc input errors
Mon Sep 21 16:05:32.344 UTC
     92327 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

RP/0/7/CPU0:xr12k#show int se0/1/0/3 | inc input errors
Mon Sep 21 16:06:00.418 UTC
     92329 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

RP/0/7/CPU0:xr12k#show controller t3 0/1/0/3
Mon Sep 21 16:04:48.232 UTC
  T3 0/1/0/3 is administratively down
  Lower Layer is Down
  Receiver has loss of frame.
  mode: Serial
  Control parent : None
  FEAC code received: DS3 AIS Received
  Framing is C-BIT Parity, Line Code is B3ZS, Cablelength is 10ft
  Clock Source(Configured) is line
  Clock Source(Actual) is line
  Subrate is enabled. Mode: Digital-link, Bandwidth: 44210 kbps
  Remote accept is enabled
  Remote fullrate has no request outstanding
  Data in current interval (280 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation, 0 P-bit Err Secs
     0 P-bit Severely Err Secs, 0 Severely Err Framing Secs
     279 Unavailable Secs, 0 Line Errored Secs
     0 C-bit Errored Secs, 0 C-bit Severely Errored Secs
  Data in Interval 1:

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