Cisco Support Community
Community Member

POS Loopback Testing

I am trying to put up a loopback to my self by issueing the looback internal command but when I do so the interface shows up/down looped.  Shouldnt it show up up looped?  Do I need to do somehting else? 

pcf-ipfr#sh int pos2/0

POS2/0 is up, line protocol is down (looped)

  Hardware is Packet over Sonet

  Internet address is 172.x.x.x.x.xx.x.x

  MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation PPP, LCP REQsent, crc 32, loopback set (internal)

  Keepalive set (10 sec)

  Scramble enabled

  Last input 00:00:00, output never, output hang never

  Last clearing of "show interface" counters 00:12:57

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: Class-based queueing

  Output queue: 0/1000/64/0 (size/max total/threshold/drops)

     Conversations  0/205/256 (active/max active/max total)

     Reserved Conversations 1/1 (allocated/max allocated)

     Available Bandwidth 139500 kilobits/sec

  30 second input rate 0 bits/sec, 0 packets/sec

  30 second output rate 0 bits/sec, 0 packets/sec

     217 packets input, 29697 bytes, 0 no buffer

     Received 0 broadcasts, 1 runts, 0 giants, 0 throttles

              0 parity

     42 input errors, 68 CRC, 0 frame, 0 overrun, 0 ignored, 2 abort

     195 packets output, 3986 bytes, 0 underruns

     0 output errors, 0 applique, 4 interface resets

     0 output buffer failures, 0 output buffers swapped out

     1 carrier transitions

Everyone's tags (3)
Hall of Fame Super Gold

POS Loopback Testing

That is normal with PPP.

If you were to use HDLC encap, it would would show up/up (looped).

Community Member

POS Loopback Testing

Ok then I would be able to run the ping test correct?  Would I be pinging my local interface?

Hall of Fame Super Gold

POS Loopback Testing

Yes, but that is irrelevant for diagnostic purposes.

Please remember to rate useful posts clicking on the stars below.

CreatePlease to create content