c4006的RSM问题

powerlimited

Router#show interface f1
FastEthernet1 is administratively down, line protocol is down
  Hardware is AmdFE, address is 0006.2a78.7c11 (bia 0006.2a78.0000)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 252/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 02:37:01, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  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
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 watchdog, 0 multicast
     0 input packets with dribble condition detected
     21 packets output, 5208 bytes, 0 underruns
     0 1-collision pkt cntrs, 0 more-collision pkt cntrs,
     0 excessive-collision pkt cntrs
     21 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     21 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
Router#



我把3COM交换机级联到RSM的其中一个快速以太口会造成网络瘫痪,任何机器都
不通;但是,我把它接到RSM   WS-4232-L3的10/100MGT口却无任何问题.管理模块没任何问题,是SUPERVISOR 2版本.IOS已经升级过一次了.今天刚出现这种问题.
以上是RSM的FSATETHERNET1口的接口状态输出结果,请高手帮我分析一下
故障原因.谢谢!!!!!