-
GPON
网络
OLT
下
部分用户无法上网问题处理案例
【问题描述】
:
7
< br>月
9
日中午,接用户故障申诉,发现衢州中立交机房
p>
OLT
下挂部分
ONU
拨号
用户产生
678
错误,无法上
网,同一小区同一单元存在
A
用户可以拨号成功,
B
用
户无法拨号成功的故障现象,
< br>整个
OLT
下挂的
ONU
上的拨号用户都存在此问题。
中
立交
OLT
直接下挂在衢州
NE80
下面,从现象看,属于二层互通的问题,通过比对
NE80
与
MA5680T
的
MAC
表项,
发现两端
MAC
学习有差异,
无法拨号成功的用户在
OLT
< br>上可以学习成功,但在
NE80
上无法学习到,造成
p>
GPON
用户拨号失败。
【故障初步分析】
:
检查
NE80 vlan 1248
的
MAC
表项发现只能学习到
22
个
MAC
,但
OLT
上的
vlan
1248
可以学习到
44
个用户
MA
C
,说明在二层转发上有一半被丢弃了,经过分析,
问题原因可
能有以下几个方面;
1
、两端端口的硬件故障导致;
p>
2
、
NE80
接收
有问题,
NE80
丢弃了其中的部分用户
MAC
;
3
、
MA5680T
异常导致二层转发丢失。
< br>
【处理过程】
:
1
、更换
OLT
与上行
N
E80
两端端口,问题还是同样存在,排除硬件故障;
2
、检查
NE80
端
口数据发送和接收情况,通过连续两次查看端口数据报文发送和
接收情况来看,
发现与
OLT
对接的端口每秒增加的广播报文非
常多
(请见红色
字体部分),如下所示;
============================
OLT
广播报文
===================
===========
GigabitEthernet3/0/0 current state: up
Hardware is WAN-GigabitEthernet,
Address is 00e0-fc96-b4dd
Description:
To_Zhonglijiao_HWGpon
The Maximum Transmit Unit is 1500
bytes, the BandWidth is 1000000 Kbits
Send-frame-type is Ethernet_II,
loopback not set
Negotiation
disabled, full-duplex, 1000Mbps
Flow control disabled, Trust 802.1p
This port works as a Switch
Statistics last cleared:
never
Traffic statistics:
Last 5 minutes
input rate 3489814 bytes/sec, 5593 packets/sec
Last 5 minutes output rate 2231951
bytes/sec, 4059 packets/sec
packets input, 799 bytes
packets output, 92 bytes
Input:
0 shorts, 3565908 jumbos, 0 giants, 0
pauses
unicasts, 13641355
multicasts,
149190707 broadcasts
0 MulticastOctets, 0
MulticastPkts
0
input fragments, 0 jabbers
0 CRC, 0
errors, 0 overruns
Output: 0 shorts, 17279482 jumbos, 0
giants
unicasts,
10815501 multicasts, 13253467 broadcasts
0
MulticastOctets, 0 MulticastPkts
0 runts, 0 jabbers, 0 CRC
0
deferrals, 0 underruns, 0 aborts
0 collisions, 0 lates, 0
singles
0 multiples, 0 excessives
PVID is 0,
port is hybrid port
MSTP configured to disable
Port priority is 0
GigabitEthernet3/0/0 current state: up
Hardware is WAN-GigabitEthernet,
Address is 00e0-fc96-b4dd
Description:
To_Zhonglijiao_HWGpon
The Maximum Transmit Unit is 1500
bytes, the BandWidth is 1000000 Kbits
Send-frame-type is Ethernet_II,
loopback not set
Negotiation
disabled, full-duplex, 1000Mbps
Flow control disabled, Trust 802.1p
This port works as a Switch
Statistics last cleared:
never
Traffic statistics:
Last 5 minutes
input rate 3476729 bytes/sec, 5600 packets/sec
Last 5 minutes output rate 2284702
bytes/sec, 4088 packets/sec
packets input, 500 bytes
packets output, 93 bytes
Input:
0 shorts, 3565908 jumbos, 0 giants, 0
pauses
unicasts, 13641358
multicasts,
149212368 broadcasts
0 MulticastOctets, 0
MulticastPkts
0
input fragments, 0 jabbers
0 CRC, 0
errors, 0 overruns
Output: 0 shorts, 17279482 jumbos, 0
giants
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