客户现场两个办公地点相隔距离400m左右,两个办公地点有网络互通需求,当前无法使用有线互连,代理商使用两台WX4320X建立MESH链路连接两个办公地点实现数据通信,目前链路建立成功数据通信正常,通信过程中常出现丢包,影响正常业务使用。
目前链路建立成功,数据通信有丢包,分析中重点排查MESH链路信号以及空口利用率:
1.检查两台AP MESH链路信号,代理商反馈了两台AP的诊断信息,从诊断信息上看,两台设备接收对端信号都比较弱:
a. A设备接收B设备信号强度
===============display ar5drv 1 client all rssi===============
====================================================================
Station table info : Table(0x8d8f41f0) Num(1/124)
Hash info :
H1(1)
---------------------------------------------------------------------------------------------------
Station AID(1) Hash(1) Mac(741f-4ab8-5600) IsTargetready(YES) Used(YES) Ht:(NO) VHt:(YES)
[Station Current Rssi Info]:
[Rate RateFlag Aver Ctl0 Ctl1 Ctl2 Ext0 Ext1 Ext2 ]
[29.3 VH-8-S 30 26 28 128 65 67 128 ]
[58.5 VH-8-S 0 0 0 0 0 0 0 ]
[58.5 VH-8-D 0 0 0 0 0 0 0 ]
[87.8 VH-8-S 0 0 0 0 0 0 0 ]
[117.0 VH-8-S 0 0 0 0 0 0 0 ]
[117.0 VH-8-D 0 0 0 0 0 0 0 ]
[175.5 VH-8-S 0 0 0 0 0 0 0 ]
[175.5 VH-8-D 28 25 25 128 64 65 128 ]
[234.0 VH-8-S 0 0 0 0 0 0 0 ]
[234.0 VH-8-D 33 32 33 128 64 64 128 ]
[263.3 VH-8-S 0 0 0 0 0 0 0 ]
[292.5 VH-8-S 0 0 0 0 0 0 0 ]
[351.0 VH-8-S 0 0 0 0 0 0 0 ]
[351.0 VH-8-D 29 26 26 128 65 66 128 ]
[390.0 VH-8-S 0 0 0 0 0 0 0 ]
[468.0 VH-8-D 31 27 29 128 64 66 128 ]
[526.5 VH-8-D 30 26 28 128 64 66 128 ]
[585.0 VH-8-D 30 26 28 128 63 65 128 ]
[702.0 VH-8-D 31 27 28 128 64 65 128 ]
[866.7 VH-8-D 0 0 0 0 0 0 0 ]
b. B设备接收AP设备信号强度
===============display ar5drv 1 client all rssi===============
====================================================================
Station table info : Table(0x8d8f41f0) Num(1/124)
Hash info :
H1(1)
---------------------------------------------------------------------------------------------------
Station AID(1) Hash(1) Mac(741f-4ab8-53e0) IsTargetready(YES) Used(YES) Ht:(NO) VHt:(YES)
[Station Current Rssi Info]:
[Rate RateFlag Aver Ctl0 Ctl1 Ctl2 Ext0 Ext1 Ext2 ]
[29.3 VH-8-S 24 20 21 128 61 61 128 ]
[58.5 VH-8-S 0 0 0 0 0 0 0 ]
[58.5 VH-8-D 0 0 0 0 0 0 0 ]
[87.8 VH-8-S 0 0 0 0 0 0 0 ]
[117.0 VH-8-S 0 0 0 0 0 0 0 ]
[117.0 VH-8-D 28 28 30 128 61 62 128 ]
[175.5 VH-8-S 0 0 0 0 0 0 0 ]
[175.5 VH-8-D 25 21 23 128 61 63 128 ]
[234.0 VH-8-S 0 0 0 0 0 0 0 ]
[234.0 VH-8-D 26 21 24 128 61 63 128 ]
[263.3 VH-8-S 0 0 0 0 0 0 0 ]
[292.5 VH-8-S 0 0 0 0 0 0 0 ]
[351.0 VH-8-S 0 0 0 0 0 0 0 ]
[351.0 VH-8-D 26 21 24 128 61 63 128 ]
[390.0 VH-8-S 0 0 0 0 0 0 0 ]
[468.0 VH-8-D 31 30 31 128 62 63 128 ]
[526.5 VH-8-D 0 0 0 0 0 0 0 ]
[585.0 VH-8-D 0 0 0 0 0 0 0 ]
[702.0 VH-8-D 0 0 0 0 0 0 0 ]
[866.7 VH-8-D 0 0 0 0 0 0 0 ]
c.检查两台设备射频口下功率配置:
A设备射频口配置:
#
interface WLAN-Radio1/0/1
channel 52
max-power 5
mp-policy 1
mesh-profile 1
mesh peer-mac-address 741f-4ab8-5600
#
B设备射频口
#
interface WLAN-Radio1/0/1
channel 52
max-power 6
mp-policy 1
mesh-profile 1
mesh peer-mac-address 741f-4ab8-53e0
#
d.从两台AP的射频口配置看,发射功率都比较低,影响MESH链路稳定性,进而影响数据通信速率以及丢包率。
2.检查设备空口利用率
a.A设备空口利用率
===============display ar5drv 1 channelbusy===============
================================================================
ChannelBusy information
Ctl Channel: 52 Channel Band:80M
Center Freq: 58
Record Interval(s): 9
Date/Month/Year: 08/06/2009
Time(h/m/s): CtlBusy(%) TxBusy(%) RxBusy(%) ExtBusy(%)
01 22:16:18 3 0 3 0
02 22:16:09 4 0 3 0
03 22:16:00 3 0 2 0
04 22:15:51 3 0 3 0
05 22:15:42 3 0 2 0
06 22:15:33 3 0 2 0
07 22:15:24 4 0 3 0
08 22:15:15 4 0 4 0
09 22:15:06 5 0 5 0
10 22:14:57 4 0 4 0
11 22:14:48 4 0 4 0
12 00:00:00 0 0 0 0
13 00:00:00 0 0 0 0
14 00:00:00 0 0 0 0
15 00:00:00 0 0 0 0
16 00:00:00 0 0 0 0
17 00:00:00 0 0 0 0
18 00:00:00 0 0 0 0
19 00:00:00 0 0 0 0
20 00:00:00 0 0 0 0
b.B设备空口利用率
===============display ar5drv 1 channelbusy===============
================================================================
ChannelBusy information
Ctl Channel: 52 Channel Band:80M
Center Freq: 58
Record Interval(s): 9
Date/Month/Year: 08/06/2009
Time(h/m/s): CtlBusy(%) TxBusy(%) RxBusy(%) ExtBusy(%)
01 22:11:07 0 0 0 0
02 22:10:58 0 0 0 0
03 22:10:49 0 0 0 0
04 22:10:40 0 0 0 0
05 22:10:31 0 0 0 0
06 22:10:22 0 0 0 0
07 22:10:13 0 0 0 0
08 22:10:04 0 0 0 0
09 22:09:55 0 0 0 0
10 22:09:46 0 0 0 0
11 22:09:37 0 0 0 0
12 22:09:28 0 0 0 0
13 22:09:19 1 0 0 0
14 22:09:10 0 0 0 0
15 22:09:01 1 0 0 0
16 22:08:52 1 0 0 0
17 22:08:43 0 0 0 0
18 22:08:34 0 0 0 0
19 22:08:25 1 0 0 0
20 22:08:16 0 0 0 0
c.两台设备使用channel 52建立MESH链路,该信道数据5G频段,通过空口利用率看到干扰较小,同时AP发送数据量占用空口利用率也比较小。因此,空口利用率影响转发速率以及丢包率的概率比较小,非重点关注对象;
3.检查AP MESH相关配置,A/B两台设备MESH-Profile中定义了MESH链路保活时间为5秒,对于MESH链路不建议单独修改保活周期,修改之后可能造成MESH链路不稳定,导致链路反复建立,链路不稳定将影响数据正常转发:
A设备mesh-profile配置
#
wlan mesh-profile 1
mesh-id 123
bind WLAN-MESH 1
link-keep-alive 5
mesh-profile enable
#
B设备mesh-profile配置
#
wlan mesh-profile 1
mesh-id 123
bind WLAN-MESH 1
link-keep-alive 5
mesh-profile enable
#
1.删除射频接口下功率配置,使用最大功率发送,保证MESH链路建立信号以及稳定;
2.在MESH-Profile下删除保活周期,保证链路的稳定性;
通过以上优化,再次测试链路丢包情况,优化之后链路通信正常,丢包率在客户业务可接受范围内。
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