Router1#show spanning-tree 

No spanning tree instances exist.

Router2#show spanning-tree 

No spanning tree instances exist

Router1#show ip inter br | i 1/0
Serial1/0                  192.168.1.1     YES manual up                    up

Router2#show ip inter br | i 1/0
Serial1/0                  192.168.1.2     YES manual up                    up


Router1#show inter ser 1/0
Serial1/0 is up, line protocol is up (looped)
  Hardware is M1T-T3+ pa
  Internet address is 192.168.1.1/30
  MTU 4470 bytes, BW 44210 Kbit/sec, DLY 200 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  Restart-Delay is 0 secs
  Last input 00:00:01, output 00:00:01, output hang never
  Last clearing of "show interface" counters 1d20h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 0 bits/sec, 0 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     57844 packets input, 4084007 bytes, 0 no buffer
     Received 18888 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
              0 parity
     62 input errors, 62 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     57844 packets output, 4084007 bytes, 0 underruns
     0 output errors, 0 applique, 6 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     8 carrier transitions
   rxLOS inactive, rxLOF inactive, rxAIS inactive
   txAIS inactive, rxRAI inactive, txRAI inactive

Router2#show inter ser 1/0
Serial1/0 is up, line protocol is up (looped)
  Hardware is M1T-T3+ pa
  Internet address is 192.168.1.2/30
  MTU 1600 bytes, BW 44210 Kbit, DLY 200 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  Restart-Delay is 0 secs
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 1d20h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     54742 packets input, 3692135 bytes, 0 no buffer
     Received 18518 broadcasts, 0 runts, 0 giants, 0 throttles
              0 parity
     98 input errors, 88 CRC, 0 frame, 6 overrun, 0 ignored, 4 abort
     54744 packets output, 3692223 bytes, 0 underruns
     0 output errors, 0 applique, 5 interface resets
     0 output buffer failures, 0 output buffers swapped out
     9 carrier transitions
   rxLOS inactive, rxLOF inactive, rxAIS inactive
   txAIS inactive, rxRAI inactive, txRAI inactive