网络工程 - 暗光纤点对点链路上的间歇性问题 - 吾爱随笔录

在对间歇性问题提出一些建议后，我正在调查。我们在同一地点有两座建筑物，由我们拥有的 548 米光纤连接，大约 10 年前安装。在过去的 6-8 个月中，我们遇到了许多连接中断和间歇性问题。边缘交换机是运行软件版本 03.03.03se 的 Cisco 3650 (WS-C3650-24PS)，通过 SM 光纤上的 1000BaseLX SFP 连接 - 连接到运行软件版本 15.2(6)E1 的 Cisco 2960 (WS-C2960XR-24TS-I)通过 SM 光纤上的 1000BaseLX SFP 连接。

该站点正在经历看似随机的连接丢失（60-80% 的数据包丢失），如果我们在边缘交换机端口上执行关闭/不关闭，它将在短时间内恢复连接。

我们已经使用 OTDR 对光纤运行进行了测试，运行中没有明显的问题，但在远端有一些损失会说它需要清洁。我已经对光纤进行了粗略的清洁，用新的替换了 SFP 和跳线，我们仍然看到 2960 上的残次/输入错误和 3650 上的未知协议丢失，但没有输入错误。

从 3650 上的接口输出

 MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 541000 bits/sec, 211 packets/sec
  5 minute output rate 2726000 bits/sec, 322 packets/sec
     1596899766 packets input, 440076865414 bytes, 0 no buffer
     Received 86226449 broadcasts (53907138 multicasts)
     0 runts, 0 giants, 0 throttles
     302323 input errors, 302323 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 53907138 multicast, 0 pause input
     0 input packets with dribble condition detected
     3026685808 packets output, 2453674763063 bytes, 0 underruns
     0 output errors, 0 collisions, 24 interface resets
     616832 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

2960接收接口：

 MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:15, output 00:00:00, output hang never
  Last clearing of "show interface" counters 1d00h
  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 1966000 bits/sec, 232 packets/sec
  5 minute output rate 424000 bits/sec, 152 packets/sec
     16712081 packets input, 13739039186 bytes, 0 no buffer
     Received 193868 broadcasts (170085 multicasts)
     6147 runts, 0 giants, 0 throttles
     48719 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 170085 multicast, 0 pause input
     0 input packets with dribble condition detected
     9738314 packets output, 2762251700 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

有没有人有任何可能的建议？

更新：思科 2960

思科 3650