cisco2960交换机

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2023年4月6日发(作者：eset nod32 用户名和密码)

公司一个楼层交换机cisco2960的F0/21端口自己down了，一片怨声载道，人生鼎沸，

妈了个B的。

通过命令：shintf0/21看到如下结果：

cisco12#shintf0/21

FastEthernet0/21isdown,lineprotocolisdown(err-disabled)

HardwareisFastEthernet,addressis0024.1351.2e95(bia0024.1351.2e95)

MTU1500bytes,BW100000Kbit,DLY100usec,

reliability255/255,txload1/255,rxload1/255

EncapsulationARPA,loopbacknotset

Keepaliveset(10sec)

Auto-duplex,Auto-speed,mediatypeis10/100BaseTX

inputflow-controlisoff,outputflow-controlisunsupported

ARPtype:ARPA,ARPTimeout04:00:00

Lastinput19:29:25,output19:29:20,outputhangnever

Lastclearingof"showinterface"countersnever

Inputqueue:0/75/0/0(size/max/drops/flushes);Totaloutputdrops:0

Queueingstrategy:fifo

Outputqueue:0/40(size/max)

5minuteinputrate0bits/sec,0packets/sec

5minuteoutputrate0bits/sec,0packets/sec

130997686packetsinput,2bytes,0nobuffer

Received3733082broadcasts(0multicasts)

0runts,0giants,0throttles

38inputerrors,0CRC,0frame,0overrun,0ignored

0watchdog,3191174multicast,0pauseinput

0inputpacketswithdribbleconditiondetected

121355446packetsoutput,78684231708bytes,0underruns

0outputerrors,0collisions,1interfaceresets

0babbles,0latecollision,0deferred

0lostcarrier,0nocarrier,0PAUSEoutput

0outputbufferfailures,0outputbuffersswappedout

通过红色部分了解端口处于故障状态，然后通过命令shlogging看看日志，结果如下：

cisco12#shlogging

Sysloglogging:enabled(0messagesdropped,1messagesrate-limited,0flushes,0overruns,

xmldisabled,filteringdisabled)

Consolelogging:leveldebugging,219messageslogged,xmldisabled,

filteringdisabled

Monitorlogging:leveldebugging,0messageslogged,xmldisabled,

filteringdisabled

Bufferlogging:leveldebugging,219messageslogged,xmldisabled,

filteringdisabled

ExceptionLogging:size(4096bytes)

Countandtimestamploggingmessages:disabled

Filelogging:disabled

Traplogging:levelinformational,222messagelineslogged

LogBuffer(4096bytes):

hernet0/5,changedstatetodown

7w5d:%LINK-3-UPDOWN:InterfaceFastEthernet0/5,changedstatetoup

7w5d:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceFastEthernet0/5,changed

statetoup

7w5d:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceFastEthernet0/5,changed

statetodown

7w5d:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceFastEthernet0/5,changed

statetoup

7w5d:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceFastEthernet0/5,changed

statetodown

7w5d:%LINK-3-UPDOWN:InterfaceFastEthernet0/5,changedstatetodown

7w5d:%LINK-3-UPDOWN:InterfaceFastEthernet0/5,changedstatetoup

7w5d:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceFastEthernet0/5,changed

statetoup

7w5d:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceFastEthernet0/5,changed

statetodown

7w5d:%LINK-3-UPDOWN:InterfaceFastEthernet0/5,changedstatetodown

7w6d:%LINK-3-UPDOWN:InterfaceFastEthernet0/5,changedstatetoup