802.11ac无线吞吐量测试和验证指南
简介
本文档将介绍测试接入点无线吞吐量的方法，重点介绍802.11ac，以及给定条件下预期的吞吐量。
先决条件
要求
本文档假设已在802.11ac接入点(AP)上进行正常运行的设置，使客户端连接已实现
使用的组件
本文档中的信息侧重于802.11ac技术和速度。
采用Wave1技术的思科AP:
3700系列
2700系列
1700系列
1570系列
采用Wave2技术的思科AP:
4800系列
3800系列
2800系列
1850系列
1830系列
1560系列
1540系列
了解
802.11ac可细分为两个标准：Wave1和Wave2:
802.11ac Wave1:支持高达1.3 Gbps的3个空间流数据速率，80 MHz信道绑定。
802.11ac Wave 2:在4个空间流上支持高达3.47 Gbps的数据速率（160 MHz信道绑定）。这些数字仅是标准中的理论数字，差异将根据特定AP数据表应用。
802.11ac不是直接在数据速率速度中定义的，而是10调制编码方案（MCS 0到MCS 9）的组合，信道宽度范围为20mhz（1个信道）到160mhz（8个信道），空间流数量（通常为1到4个信道）。 短或长保护间隔(GI)也会对此添加约10%的修改。下表用于在了解所有这些因素时以Mbps为单位评估数据：
| 空间流 |
VHT MCS 索引 |
调制 |
编码速率 |
20 MHz 数据速率(Mb/s) |
40 MHz 数据速率(Mb/s) |
80 MHz 数据速率(Mb/s) |
160 MHz / 80+80 MHz 数据传输速度 (Mb/s) |
||||
| 800纳秒GI |
400纳秒GI |
800纳秒GI |
400纳秒GI |
800纳秒GI |
400纳秒GI |
800纳秒GI |
400纳秒GI |
||||
| 1 |
0 |
BPSK |
1/2 |
6.5 |
7.2 |
13.5 |
15.0 |
29.3 |
32.5 |
58.5 |
65.0 |
| 1 |
QPSK |
1/2 |
13.0 |
14.4 |
27.0 |
30.0 |
58.5 |
65.0 |
117.0 |
130.0 |
|
| 2 |
QPSK |
3/4 |
19.5 |
21.7 |
40.5 |
45.0 |
87.8 |
97.5 |
175.5 |
195.0 |
|
| 3 |
16-QAM |
1/2 |
26.0 |
28.9 |
54.0 |
60.0 |
117.0 |
130.0 |
234.0 |
260.0 |
|
| 4 |
16-QAM |
3/4 |
39.0 |
43.3 |
81.0 |
90.0 |
175.5 |
195.0 |
351.0 |
390.0 |
|
| 5 |
64-QAM |
2/3 |
52.0 |
57.8 |
108.0 |
120.0 |
234.0 |
260.0 |
468.0 |
520.0 |
|
| 6 |
64-QAM |
3/4 |
58.5 |
65.0 |
121.5 |
135.0 |
263.3 |
292.5 |
526.5 |
585.0 |
|
| 7 |
64-QAM |
5/6 |
65.0 |
72.2 |
135.0 |
150.0 |
292.5 |
325.0 |
585.0 |
650.0 |
|
| 8 |
256-QAM |
3/4 |
78.0 |
86.7 |
162.0 |
180.0 |
351.0 |
390.0 |
702.0 |
780.0 |
|
| 9 |
256-QAM |
5/6 |
n/a |
n/a |
180.0 |
200.0 |
390.0 |
433.3 |
780.0 |
866.7 |
|
| 2 |
0 |
BPSK |
1/2 |
13.0 |
14.4 |
27.0 |
30.0 |
58.5 |
65.0 |
117.0 |
130.0 |
| 1 |
QPSK |
1/2 |
26.0 |
28.9 |
54.0 |
60.0 |
117.0 |
130.0 |
234.0 |
260.0 |
|
| 2 |
QPSK |
3/4 |
39.0 |
43.3 |
81.0 |
90.0 |
175.5 |
195.0 |
351.0 |
390.0 |
|
| 3 |
16-QAM |
1/2 |
52.0 |
57.8 |
108.0 |
120.0 |
234.0 |
260.0 |
468.0 |
520.0 |
|
| 4 |
16-QAM |
3/4 |
78.0 |
86.7 |
162.0 |
180.0 |
351.0 |
390.0 |
702.0 |
780.0 |
|
| 5 |
64-QAM |
2/3 |
104.0 |
115.6 |
216.0 |
240.0 |
468.0 |
520.0 |
936.0 |
1040.0 |
|
| 6 |
64-QAM |
3/4 |
117.0 |
130.0 |
243.0 |
270.0 |
526.5 |
585.0 |
1053.0 |
1170.0 |
|
| 7 |
64-QAM |
5/6 |
130.0 |
144.4 |
270.0 |
300.0 |
585.0 |
650.0 |
1170.0 |
1300.0 |
|
| 8 |
256-QAM |
3/4 |
156.0 |
173.3 |
324.0 |
360.0 |
702.0 |
780.0 |
1404.0 |
1560.0 |
|
| 9 |
256-QAM |
5/6 |
n/a |
n/a |
360.0 |
400.0 |
780.0 |
866.7 |
1560.0 |
1733.0 |
|
| 3 |
0 |
BPSK |
1/2 |
19.5 |
21.7 |
40.5 |
45.0 |
87.8 |
97.5 |
175.5 |
195.0 |
| 1 |
QPSK |
1/2 |
39.0 |
43.3 |
81.0 |
90.0 |
175.0 |
195.0 |
351.0 |
390.0 |
|
| 2 |
QPSK |
3/4 |
58.5 |
65.0 |
121.5 |
135.0 |
263.0 |
292.5 |
526.5 |
585.0 |
|
| 3 |
16-QAM |
1/2 |
78.0 |
86.7 |
162.0 |
180.0 |
351.0 |
390.0 |
702.0 |
780.0 |
|
| 4 |
16-QAM |
3/4 |
117.0 |
130.0 |
243.0 |
270.0 |
526.5 |
585.0 |
1053.0 |
1170.0 |
|
| 5 |
64-QAM |
2/3 |
156.0 |
173.3 |
324.0 |
360.0 |
702.0 |
780.0 |
1404.0 |
1560.0 |
|
| 6 |
64-QAM |
3/4 |
175.5 |
195.0 |
364.5 |
405.0 |
n/a |
n/a |
1579.5 |
1755.0 |
|
| 7 |
64-QAM |
5/6 |
195.0 |
216.7 |
405.0 |
450.0 |
877.5 |
975.0 |
1755.0 |
1950.0 |
|
| 8 |
256-QAM |
3/4 |
234.0 |
260.0 |
486.0 |
540.0 |
1053.0 |
1170.0 |
2106.0 |
2340.0 |
|
| 9 |
256-QAM |
5/6 |
260.0 |
288.9 |
540.0 |
600.0 |
1170.0 |
1300.0 |
n/a |
n/a |
|
| 4 |
0 |
BPSK |
1/2 |
26.0 |
28.9 |
54.0 |
60.0 |
117.0 |
130.0 |
234.0 |
260.0 |
| 1 |
QPSK |
1/2 |
52.0 |
57.8 |
108.0 |
120.0 |
234.0 |
260.0 |
468.0 |
520.0 |
|
| 2 |
QPSK |
3/4 |
78.0 |
86.7 |
162.0 |
180.0 |
351.0 |
390.0 |
702.0 |
780.0 |
|
| 3 |
16-QAM |
1/2 |
104.0 |
115.6 |
216.0 |
240.0 |
468.0 |
520.0 |
936.0 |
1040.0 |
|
| 4 |
16-QAM |
3/4 |
156.0 |
173.3 |
324.0 |
360.0 |
702.0 |
780.0 |
1404.0 |
1560.0 |
|
| 5 |
64-QAM |
2/3 |
208.0 |
231.1 |
432.0 |
480.0 |
936.0 |
1040.0 |
1872.0 |
2080.0 |
|
| 6 |
64-QAM |
3/4 |
234.0 |
260.0 |
486.0 |
540.0 |
1053.0 |
1170.0 |
2106.0 |
2340.0 |
|
| 7 |
64-QAM |
5/6 |
260.0 |
288.9 |
540.0 |
600.0 |
1170.0 |
1300.0 |
2340.0 |
2600.0 |
|
| 8 |
256-QAM |
3/4 |
312.0 |
346.7 |
648.0 |
720.0 |
1404.0 |
1560.0 |
2808.0 |
3120.0 |
|
| 9 |
256-QAM |
5/6 |
n/a |
n/a |
720.0 |
800.0 |
1560.0 |
1733.3 |
3120.0 |
3466.7 |
|
| 9 |
256-QAM |
5/6 |
n/a |
n/a |
1440.0 |
1600.0 |
3120.0 |
3466.7 |
6240.0 |
6933.3 |
|
请注意，无线是共享环境，这意味着连接到AP的客户端数量将在彼此之间共享有效吞吐量。此外，客户端越多，争用越多，冲突也不可避免。随着客户端数量的增加，覆盖信元的效率将显着下降。
这是一条经验法则：
预期吞吐量=数据速率x 0.65
在本例中：
780 x 0.65 = 507
507 Mbps的吞吐量是在实验室中使用单个客户端时在良好条件下所期望的。
度量
通常，在进行吞吐量测试时，我们可以有两种方案：
- AP在Flexconnect本地交换中
- AP处于本地模式或Flexconnect中央交换
我们将逐个采用这些场景：
（图1）
在图1中，我们假设AP处于Flexconnect中央交换的本地模式。
这意味着所有客户端流量都封装到CAPWAP隧道中并在WLC上终止。
（图2）
图2中的红线显示来自无线客户端的流量。
iPerf服务器应尽可能靠近流量终端点，最好与WLC本身插入同一交换机，并使用同一VLAN。
在Flexconnect本地交换中，客户端流量在AP本身上终止，并且考虑到iPerf服务器应设置为接近无线客户端流量的终止点，您应将iPerf服务器插入到插入AP的同一交换机和同一VLAN。在本例中，这是接入交换机（图3）。
（图3）
iPerf测试可分为两类：上游和下游。
考虑到iPerf服务器正在侦听，而iPerf客户端正在生成流量，当iPerf服务器在有线端时，这被视为上游测试。
无线客户端将使用iPerf应用将流量推送到网络。
下行测试反之亦然，这意味着iPerf服务器设置在无线客户端本身上，而iPerf客户端位于将流量推送到无线客户端的有线端，在这种情况下，这被视为下行。
测试应使用TCP和UDP完成。您可以使用以下命令执行测试：
iperf3 -s <- this command starts iPerf server iperf3 -c SERVER_ADDRESS -u -b700M <- this command initiates UDP iPerf test with bandwidth of 700 Mbps iperf3 -c SERVER_ADDRESS <- this command initiates a simple TCP iPerf test iperf3 -c SERVER_ADDRESS -w WIDOW_SIZE -P NUM_OF_PARALLEL_TCP_STREAMS <- this commands initiates a more complex TCP iPerf test where you can adjust the window size as well the number of parallel TCP streams.
Please not that in this case you should consider the sum of all the streams as the result
iPerf3输出示例：
TCP iPerf3:
[ ID] Interval Transfer Bandwidth [ 5] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 5] 0.00-10.06 sec 188 MBytes 157 Mbits/sec receiver [ ID] Interval Transfer Bandwidth [ 5] 0.00-10.05 sec 0.00 Bytes 0.00 bits/sec sender [ 5] 0.00-10.05 sec 304 MBytes 254 Mbits/sec receiver
With 10 parallel TCP streams: [ ID] Interval Transfer Bandwidth [ 5] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 5] 0.00-10.06 sec 88.6 MBytes 73.9 Mbits/sec receiver [ 7] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 7] 0.00-10.06 sec 79.2 MBytes 66.0 Mbits/sec receiver [ 9] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 9] 0.00-10.06 sec 33.6 MBytes 28.0 Mbits/sec receiver [ 11] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 11] 0.00-10.06 sec 48.7 MBytes 40.6 Mbits/sec receiver [ 13] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 13] 0.00-10.06 sec 77.0 MBytes 64.2 Mbits/sec receiver [ 15] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 15] 0.00-10.06 sec 61.8 MBytes 51.5 Mbits/sec receiver [ 17] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 17] 0.00-10.06 sec 46.1 MBytes 38.4 Mbits/sec receiver [ 19] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 19] 0.00-10.06 sec 43.9 MBytes 36.6 Mbits/sec receiver [ 21] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 21] 0.00-10.06 sec 33.3 MBytes 27.8 Mbits/sec receiver [ 23] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [ 23] 0.00-10.06 sec 88.8 MBytes 74.0 Mbits/sec receiver [SUM] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender [SUM] 0.00-10.06 sec 601 MBytes 501 Mbits/sec receiver
UDP iPerf3:
有时IPerf行为不当，在UDP测试结束时不提供平均带宽。
仍然可以将每秒的带宽总和，然后按秒数进行分割：
Accepted connection from 192.168.240.38, port 49264 [ 5] local 192.168.240.43 port 5201 connected to 192.168.240.38 port 51711 [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 5] 0.00-1.00 sec 53.3 MBytes 447 Mbits/sec 0.113 ms 32/6840 (0.47%) [ 5] 1.00-2.00 sec 63.5 MBytes 533 Mbits/sec 0.129 ms 29/8161 (0.36%) [ 5] 2.00-3.00 sec 69.8 MBytes 586 Mbits/sec 0.067 ms 30/8968 (0.33%) [ 5] 3.00-4.00 sec 68.7 MBytes 577 Mbits/sec 0.071 ms 29/8827 (0.33%) [ 5] 4.00-5.00 sec 68.0 MBytes 571 Mbits/sec 0.086 ms 55/8736 (0.63%) [ 5] 5.00-6.00 sec 68.6 MBytes 576 Mbits/sec 0.076 ms 70/8854 (0.79%) [ 5] 6.00-7.00 sec 66.8 MBytes 561 Mbits/sec 0.073 ms 34/8587 (0.4%) [ 5] 7.00-8.00 sec 67.1 MBytes 563 Mbits/sec 0.105 ms 44/8634 (0.51%) [ 5] 8.00-9.00 sec 66.7 MBytes 559 Mbits/sec 0.183 ms 144/8603 (1.7%) [ 5] 9.00-10.00 sec 64.1 MBytes 536 Mbits/sec 0.472 ms 314/8415 (3.7%) [ 5] 10.00-10.05 sec 488 KBytes 76.0 Mbits/sec 0.655 ms 2/63 (3.2%) - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 5] 0.00-10.05 sec 0.00 Bytes 0.00 bits/sec 0.655 ms 783/84688 (0.92%) [SUM] 0.0-10.1 sec 224 datagrams received out-of-order
。
验证和验证
要检查客户端连接的数据速率，您需要在WLC CLI中发出以下命令：
(Cisco Controller) >show client detail 94:65:2d:d4:8c:d6
Client MAC Address............................... 94:65:2d:d4:8c:d6
Client Username ................................. N/A
AP MAC Address................................... 00:81:c4:fb:a8:20
AP Name.......................................... AIR-AP3802I-E-K9
AP radio slot Id................................. 1
Client State..................................... Associated
Client User Group................................
Client NAC OOB State............................. Access
Wireless LAN Id.................................. 2
Wireless LAN Network Name (SSID)................. speed-test-WLAN-avitosin
Wireless LAN Profile Name........................ speed-test
Hotspot (802.11u)................................ Not Supported
BSSID............................................ 00:81:c4:fb:a8:2e
Connected For ................................... 91 secs
Channel.......................................... 52
IP Address....................................... 192.168.240.33
Gateway Address.................................. 192.168.240.1
Netmask.......................................... 255.255.255.0
Association Id................................... 1
Authentication Algorithm......................... Open System
Reason Code...................................... 1
Status Code...................................... 0
--More-- or (q)uit
Session Timeout.................................. 1800
Client CCX version............................... No CCX support
QoS Level........................................ Silver
Avg data Rate.................................... 0
Burst data Rate.................................. 0
Avg Real time data Rate.......................... 0
Burst Real Time data Rate........................ 0
802.1P Priority Tag.............................. disabled
CTS Security Group Tag........................... Not Applicable
KTS CAC Capability............................... No
Qos Map Capability............................... No
WMM Support...................................... Enabled
APSD ACs....................................... BK BE VI VO
Current Rate..................................... m9 ss2
Supported Rates.................................. 12.0,18.0,24.0,36.0,48.0,
............................................. 54.0
Mobility State................................... Local
Mobility Move Count.............................. 0
Security Policy Completed........................ Yes
Policy Manager State............................. RUN
Audit Session ID................................. 0a3027a4000000105a9cd9ad
AAA Role Type.................................... none
Local Policy Applied............................. none
--More-- or (q)uit
IPv4 ACL Name.................................... none
FlexConnect ACL Applied Status................... Unavailable
IPv4 ACL Applied Status.......................... Unavailable
IPv6 ACL Name.................................... none
IPv6 ACL Applied Status.......................... Unavailable
Layer2 ACL Name.................................. none
Layer2 ACL Applied Status........................ Unavailable
mDNS Status...................................... Disabled
mDNS Profile Name................................ none
No. of mDNS Services Advertised.................. 0
Policy Type...................................... N/A
Encryption Cipher................................ None
Protected Management Frame ...................... No
Management Frame Protection...................... No
EAP Type......................................... Unknown
Interface........................................ vlan240
VLAN............................................. 240
Quarantine VLAN.................................. 0
Access VLAN...................................... 240
Local Bridging VLAN.............................. 240
Client Capabilities:
CF Pollable................................ Not implemented
CF Poll Request............................ Not implemented
--More-- or (q)uit
Short Preamble............................. Not implemented
PBCC....................................... Not implemented
Channel Agility............................ Not implemented
Listen Interval............................ 1
Fast BSS Transition........................ Not implemented
11v BSS Transition......................... Implemented
Client Wifi Direct Capabilities:
WFD capable................................ No
Manged WFD capable......................... No
Cross Connection Capable................... No
Support Concurrent Operation............... No
Fast BSS Transition Details:
Client Statistics:
Number of Bytes Received................... 183844
Number of Bytes Sent....................... 119182
Total Number of Bytes Sent................. 119182
Total Number of Bytes Recv................. 183844
Number of Bytes Sent (last 90s)............ 119182
Number of Bytes Recv (last 90s)............ 183844
Number of Packets Received................. 2536
Number of Packets Sent..................... 249
Number of Interim-Update Sent.............. 0
Number of EAP Id Request Msg Timeouts...... 0
--More-- or (q)uit
Number of EAP Id Request Msg Failures...... 0
Number of EAP Request Msg Timeouts......... 0
Number of EAP Request Msg Failures......... 0
Number of EAP Key Msg Timeouts............. 0
Number of EAP Key Msg Failures............. 0
Number of Data Retries..................... 0
Number of RTS Retries...................... 0
Number of Duplicate Received Packets....... 0
Number of Decrypt Failed Packets........... 0
Number of Mic Failured Packets............. 0
Number of Mic Missing Packets.............. 0
Number of RA Packets Dropped............... 0
Number of Policy Errors.................... 0
Radio Signal Strength Indicator............ -25 dBm
Signal to Noise Ratio...................... 67 dB
Client Rate Limiting Statistics:
Number of Data Packets Received............ 0
Number of Data Rx Packets Dropped.......... 0
Number of Data Bytes Received.............. 0
Number of Data Rx Bytes Dropped............ 0
Number of Realtime Packets Received........ 0
Number of Realtime Rx Packets Dropped...... 0
Number of Realtime Bytes Received.......... 0
--More-- or (q)uit
Number of Realtime Rx Bytes Dropped........ 0
Number of Data Packets Sent................ 0
Number of Data Tx Packets Dropped.......... 0
Number of Data Bytes Sent.................. 0
Number of Data Tx Bytes Dropped............ 0
Number of Realtime Packets Sent............ 0
Number of Realtime Tx Packets Dropped...... 0
Number of Realtime Bytes Sent.............. 0
Number of Realtime Tx Bytes Dropped........ 0
Nearby AP Statistics:
DNS Server details:
DNS server IP ............................. 10.48.39.33
DNS server IP ............................. 0.0.0.0
Assisted Roaming Prediction List details:
Client Dhcp Required: False
Allowed (URL)IP Addresses
-------------------------
AVC Profile Name: ............................... none
您可以看到此特定客户端按以下速率连接：
当前速率…….................................. m9 ss2
这意味着客户端正在对2个空间流(ss2)使用MCS 9(m9)索引
通过“show client detail <MAC>”命令，无法查看客户端是否连接在20/40/80 MHz信道绑定上。
这可以直接在AP上完成：
Wave2 AP示例：
AIR-AP3802I-E-K9#show controllers dot11Radio 1 client 94:65:2D:D4:8C:D6
mac radio vap aid state encr Maxrate is_wgb_wired wgb_mac_addr
94:65:2D:D4:8C:D6 1 1 1 FWD OPEN MCS92SS false 00:00:00:00:00:00
Configured rates for client 94:65:2D:D4:8C:D6
Legacy Rates(Mbps): 12 18 24 36 48 54
HT Rates(MCS):M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 M12 M13 M14 M15
VHT Rates: 1SS:M0-7 2SS:M0-9
HT:yes VHT:yes 80MHz:yes 40MHz:yes AMSDU:yes AMSDU_long:yes
11w:no MFP:no 11h:yes encrypt_polocy: 1
_wmm_enabled:yes qos_capable:yes WME(11e):no WMM_MIXED_MODE:no
short_preamble:no short_slot_time:no short_hdr:no SM_dyn:yes
short_GI_20M:yes short_GI_40M:yes short_GI_80M:yes LDPC:yes
is_wgb_wired:no is_wgb:no
Additional info for client 94:65:2D:D4:8C:D6
RSSI: -25
PS : Legacy (Awake)
Tx Rate: 0 Kbps
Rx Rate: 0 Kbps
VHT_TXMAP: 0
CCX Ver: 0
Statistics for client 94:65:2D:D4:8C:D6
mac intf TxData TxMgmt TxUC TxBytes TxFail TxDcrd RxData RxMgmt RxBytes RxErr TxRt RxRt idle_counter stats_ago expiration
94:65:2D:D4:8C:D6 apr1v1 254 0 254 121390 0 0 2568 0 185511 0 585000 866700 300 2.492000 1640
Per TID packet statistics for client 94:65:2D:D4:8C:D6
Priority Rx Pkts Tx Pkts Rx(last 5 s) Tx (last 5 s) QID Tx Drops Tx Cur Qlimit
0 1424 146 17 3 136 0 0 4096
1 0 0 0 0 137 0 0 4096
2 0 0 0 0 138 0 0 4096
3 34 26 0 0 139 0 0 4096
4 0 0 0 0 140 0 0 4096
5 0 0 0 0 141 0 0 4096
6 0 0 0 0 142 0 0 4096
7 0 0 0 0 143 0 0 4096
对于Wave1 AP，您需要运行调试：
debug dot11 dot11radio 1 trace print rates *Mar 5 06:21:50.175: 469A706-1 D48CD6 - add-rbf, tmr 4 pak 19 rssi -41 dBm rate a8.2-8 *Mar 5 06:21:50.175: 469A8B1-1 D48CD6 - added to rbf, status 30 istatus 40164 cl ri 1 mvl ri 0000 req 1 in 1
调试输出的含义见下图：
检查连接速率的最后一个选项是OTA捕获。在数据包的无线电信息中，您可以找到必要的信息：
此OTA捕获是使用11ac macbook客户端捕获的。
考虑到我们从WLC和AP获取的信息，客户端以80 MHz信道绑定+长GI(800ns)在m9 ss2上连接，这意味着我们可以预期数据速率为780 Mbps。
故障排除
如果您在测试期间没有获得预期结果，有多种方法可以在打开TAC案例之前对问题进行故障排除并收集必要信息。
故障排除问题可能由以下因素引起：
— 客户端
- AP
— 有线路径（交换相关问题）
- WLC
客户端故障排除
- 第一步是将无线客户端设备上的驱动程序更新为最新版本
- 第二步是对具有不同无线适配器的客户端执行iPerf测试，以查看您是否获得相同结果
AP故障排除
当AP丢弃流量、某些帧或其他行为不正时，可能会出现这种情况。
为了更深入地了解这一点，需要在AP交换机端口上通过空中(OTA)捕获+span会话（span应在连接AP的交换机上完成）
OTA捕获和SPAN应在测试期间完成，使用开放SSID，以便能够看到传递到AP的流量和AP传递到客户端的流量，反之亦然。
此行为存在几个已知错误：
CSCvg07438 
:AP3800:由于分段和非分段数据包中的AP中丢包导致吞吐量低
CSCva58429 :思科1532i AP:低吞吐量（FlexConnect本地交换+ EoGRE）
有线路径故障排除
交换机本身可能存在一些问题，您需要检查接口上的丢包量，以及这些丢包在测试期间是否增加。
尝试使用交换机上的其他端口连接AP或WLC。
另一种方法是将客户端插入到同一台交换机（客户端终端点[AP/WLC]连接到该交换机），并将其放入同一VLAN，然后在同一VLAN上运行有线测试，以查看有线路径中是否存在任何问题。
WLC故障排除
可能是WLC正在丢弃来自客户端的流量（当AP处于本地模式时）。
您可以将AP置于Flexconnect模式，将WLAN置于本地交换模式，然后运行测试。
如果您发现本地模式（中央交换）的吞吐量与Flexconnect本地交换相比存在显着差异，并且连接到WLC的交换机上没有问题，则WLC很可能会丢弃流量。
要排除此故障，请遵循行动计划：
- WLC交换机端口上的SPAN捕获（应在交换机上完成）
- AP端口上的SPAN捕获
— 客户端的OTA捕获
- WLC上的以下调试：
debug fastpath dump fpapool debug fastpath dump dpcp-stats debug fastpath dump detailstats debug fastpath dump stats
通过执行上述故障排除并向TAC提供结果，这将加快故障排除过程。
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