1.产品文档对状态灯介绍如下图，表示有告警。
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2.通过display alarm all查看告警，发现GigabitEthernet1/0/4 出现异常。
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===============display alarm all===============
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15:52:58 2014/11/23
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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。
