访问省数据中心服务器频繁掉线故障，该如何处理？( 二 ) _云知道

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slotclass idtype idhardware verfirmware version
slot 0main boardMB_M8241_26901.001.00
slot 3ether cardNM_2FE1.001.00
slot 4sync cardNM_2HS1.001.00
5、设备软件版本已是最新，对该版本TAC中心没有通告过类似故障情况。

批注：根据分段排查原则，在确认内网正常后，对出口问题排查路由器工作状态。对于掉线类型的故障，确定路由器设备配置正确的同时，也要确定CPU利用率是否过高。此外我们建议确保设备软件版本是我司发布的最新相应版本，软件版本可以登陆锐捷网站下载。

6、故障发生时,SH 路由器串口信息：

Red-Giant#shinterface serial 4/1

serial 4/1 is UP, line protocol is DOWN

Hardware is Infineon DSCC4 PEB20534 H-10 serial

Description: jianyang

Interface address is: 192.168.8.34/30

MTU 1500 bytes, BW 2000 Kbit

Encapsulation protocol is PPP, loopback not set, but seems as if in loopback state.

Keepalive interval is 200 sec , set

Carrier delay is 2 sec

RXload is 11 ,Txload is 2

LCP Acksent

Closed: ipcp

Queueing strategy: WFQ

5 minutes input rate 90808 bits/sec, 32 packets/sec

5 minutes output rate 22092 bits/sec, 33 packets/sec

343821 packets input, 129308802 bytes, 0 res lack, 0 no buffer,3 dropped

Received 1 broadcasts, 0 runts, 0 giants

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 abort

339962 packets output, 27542504 bytes, 0 underruns,14 dropped

0 output errors, 0 collisions, 2 interface resets

3 carrier transitions

V35 DTE cable

DCD=upDSR=upDTR=upRTS=upCTS=up

从标红部分我们可用看出,物理线路正常,问题出在LCP协商上，接口状态提示有环路。

批注：根据分段排查的原则，我们可以通过SH INTERFACE命令，确认故障发生时，路由器外网端口是否正常转发数据。

7、电信工程师配合将光猫到局端打环测试,发现光猫设备存在问题,电信将两端光猫更换,但测试发现故障依然存在。

批注：根据分段排查的原则，确认广域网线路是否存在传输问题。

8、使用DEBUG命令跟踪分析PPP:

Red-Giant#debug ppp error

PPP: serial 4/0 rcvd id 106 didn't match sentid 109 ,dropping packet, state=Acksent

bu

PPP:serial 4/0 state is FSM_TERMSENT ,dropping packet

PPP: serial 4/0 rcvd id 107 didn't match sentid 110 ,dropping packet, state=Termsent

PPP:serial 4/0 state is FSM_TERMSENT ,dropping packet

PPP: serial 4/0 rcvd id 108 didn't match sentid 111 ,dropping packet, state=Termsent

PPP:serial 4/0 state is FSM_TERMSENT ,dropping packet

PPP: serial 4/0 rcvd id 109 didn't match sentid 112 ,dropping packet, state=Termsent

PPP: serial 4/0 rcvd id 110 didn't match sentid 113 ,dropping packet, state=Acksent

PPP: serial 4/0 rcvd id 111 didn't match sentid 113 ,dropping packet, state=Acksent

PPP: serial 4/0 rcvd id 112 didn't match sentid 113 ,dropping packet, state=Acksent

PPP: serial 4/0 LCP appears to be looped back.

PPP: serial 4/0 LCP appears to be looped back.

在sh interface serial 4/1输出中LCP协商一直为Acksent的原因找到,继续分析，网络使用一段时间后，会rcvd id 与 sentid 号出现不一致现象。向TAC中心反馈该情况后，初步判定问题可能是因为G/V转换器处理异常造成（此部分只能根据获取的DEBUG信息估计，协议转换器的内部具体情况，我们不了解）。