[c-nsp] OC48 with line proto down still routes via that interface

[Aaron Daubman]

To follow up my previous question of ignored packets, I'm now seeing
perfect traffic flow through the LC, however line protocol remains
down - I didn't think this was possible...

I'm using HDLC encap on an ISE OC48 LC connected to an ONS15454
connected to an Ixia.

Even though the GSR's pos1/0:1 shows line protocol down, I'm sending
in 10000fps via that OC48 and routing it successfully out a GigE LC.
Shouldn't an up/down state of an interface still prevent traffic flow?

Thanks again,
     ~Aaron

GSR-1#sh int pos1/0:1 cont
POS1/0:1 is up, line protocol is down
  Hardware is Packet over SONET
  MTU 4470 bytes, BW 2488000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation HDLC, crc 32, loopback not set
  Keepalive set (10 sec)
  Scramble enabled
  Carrier delay is 0 msec
  Last input never, output 00:00:04, output hang never
  Last clearing of "show interface" counters 00:01:32
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
        Available Bandwidth 2395851 kilobits/sec
  30 second input rate 97239000 bits/sec, 9913 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     925179 packets input, 1134269454 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
              0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     9 packets output, 216 bytes, 0 underruns
     0 output errors, 0 applique, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

POS1/0:1
PATH
  AIS = 0          RDI    = 0          FEBE = 0          BIP(B3) = 0
  LOP = 0          NEWPTR = 0          PSE  = 0          NSE     = 0

Active Defects: None
Active Alarms:  None
Alarm reporting enabled for: PLOP B3-TCA

  S1S0 = 00, C2 = 16
PATH TRACE BUFFER : STABLE
  Remote hostname :
  Remote interface:
  Remote IP addr  :
  Remote Rx(K1/K2):   /    Tx(K1/K2):   /

BER thresholds:  B3 = 10e-6