求助个思科路由的问题

snakeviper

2M点对点专线，端口配置都相同，封装协议都是PPP，但是S口协议起不了，有CRC报错
Serial0/1/0:0 is up, line protocol is down
  Hardware is GT96K Serial
  Internet address is 29.1.4.98/30
  MTU 1500 bytes, BW 2048 Kbit/sec, DLY 20000 usec,
     reliability 184/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP REQsent, loopback not set
  Keepalive set (10 sec)
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters 07:42:37
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/1/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1536 kilobits/sec
  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, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     4635 input errors, 4635 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     5534 packets output, 77476 bytes, 0 underruns
     0 output errors, 0 collisions, 553 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions
  Timeslot(s) Used: UNFRAMED, SCC: 0, Transmitter delay is 0 flags

chris3687994

二层是down，看看二层哪里错了吧