某局接口收光功率低导致USG9500ALM灯亮红灯

主控上ATM灯亮红灯，具体见下图。

#Nov 13 2014 00:49:20 imau-firewall SRM_BASE/2/PORTPHYSICALDOWN: OID 1.3.6.1.4.1.2011.5.25.129.2.5.1 Physical state of the port changed to down. (EntityPhysicalIndex=16842760, BaseTrapSeverity=3, BaseTrapProbableCause=74752, BaseTrapEventType=5, EntPhysicalName="GigabitEthernet1/0/4")
#Nov 13 2014 00:51:02 imau-firewall SRM_BASE/2/PORTPHYSICALUP: OID 1.3.6.1.4.1.2011.5.25.129.2.5.2 Physical state of the port changes to up. (EntityPhysicalIndex=16842760, BaseTrapSeverity=3, BaseTrapProbableCause=74752, BaseTrapEventType=5, EntPhysicalName="GigabitEthernet1/0/4")

1.产品文档对状态灯介绍如下图，表示有告警。

2.通过display alarm all查看告警，发现GigabitEthernet1/0/4 出现异常。
=====================================================
  ===============display alarm all===============
=====================================================
15:52:58  2014/11/23
----------------------------------------------------------------------------
Index  Level      Date      Time                        Info

1      Emergency  14-11-23  09:23:27    The optical module worked abnormally.[
                                        GigabitEthernet1/0/4]
3.告警日志logbuffer中也出现up/down信息(见告警信息)。
4.查看接口GigabitEthernet1/0/4 接口信息，如下，发现有光功率低于阀值的情况。建议排查光链路和对端模块，更换新光纤尾纤后问题解决。
GigabitEthernet1/0/4 current state : UP
Line protocol current state : UP
Last line protocol up time : 2014-11-13 00:51:02
Description:Ctc_out
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 222.74.205.98/27
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 9017-acaf-5a5e
The Vendor PN is 02315200
The Vendor SN is J2248047405
The Vendor Name is HUAWEI
Port BW: 1G, Transceiver max BW: 1G, Transceiver Mode: SingleMode
WaveLength: 1310nm, Transmission Distance: 10km
Rx Power: -20.52dBm, Warning range: [-19.97, -2.97]dBm
Tx Power: -4.96dBm, Warning range: [-9.00, -3.00]dBm
Loopback:none, full-duplex mode, negotiation: disable, Pause Flowcontrol:Receive Enable and Send Enable
Last physical up time   : 2014-11-13 00:51:02
Last physical down time : 2014-11-13 00:49:21
Max input bit rate: 275306064 bits/sec at 2014-11-13 16:16:05
Max output bit rate: 94741952 bits/sec at 2014-11-17 15:14:45
Max input packet rate: 31188 packets/sec at 2014-11-13 16:16:05
Max output packet rate: 34865 packets/sec at 2014-11-19 11:05:23
Statistics last cleared:never
    Last 300 seconds input rate: 66330736 bits/sec, 9231 packets/sec
    Last 300 seconds output rate: 38893376 bits/sec, 8539 packets/sec
    Input: 6744109757571 bytes, 6918633094 packets
    Output: 2165795963624 bytes, 5669928792 packets
    Input:
      Unicast: 6916906994 packets, Multicast: 0 packets
      Broadcast: 1726100 packets, JumboOctets: 22 packets
      CRC: 0 packets, Symbol: 0 packets
      Overrun: 0 packets, InRangeLength: 0 packets
      LongPacket: 0 packets, Jabber: 0 packets, Alignment: 0 packets
      Fragment: 0 packets, Undersized Frame: 0 packets
      RxPause: 0 packets
    Output:
      Unicast: 5666873082 packets, Multicast: 0 packets
      Broadcast: 3055710 packets, JumboOctets: 0 packets
      Lost: 0 packets, Overflow: 0 packets, Underrun: 0 packets
      System: 0 packets, Overruns: 0 packets
      TxPause: 0 packets
    Input bandwidth utilization  : 6.78%
    Output bandwidth utilization : 4.03%
5.配置中发现snmp-agent trap type entity-trap；entity-trap方式会将所有的告警信息上送给网管，base-trap和dc-trap方式只会将部分告警信息上送给网管；与base-trap和dc-trap方式相比，entity-trap方式向用户提供的信息的易读性强，准确性高，但可以看出只是接口的收发光问题就会引起设备主控ATM灯告警，根据不同需求，可以通过配置snmp-agent trap type base-trap，消除接口收发光对ATM灯影响。

USG9500接口收光过低导致主控ALM灯告警

排查光链路和对端模块，对端更换新光纤尾纤减小光衰后，问题解决。