FTP传输过接入s5130s-ei交换机速率就会变慢

PC 1和PC 2同网段，s5130s-ei和sw交换机二层透传

组网如下：

100.1.1.2     PC 2 ------------(G 1/0/1) 5130S-EI (G 1/0/17)--------------(G 2/0/33)SW (G 2/0/35) -----------pc 1    100.1.1.1

                                                                                       T 1/0/50                        T 2/0/1

客户反馈，两台终端设备互传文件，组网经过交换机转发，传输文件速率很慢。

查看设备上无拥塞，不存在丢包导致TCP重传，进而导致传输速率变慢的可能。

后实验室按照组网测试发现：

100.1.1.2     PC 2 ------------(G 1/0/1) 5130S-EI (G 1/0/17)--------------(G 2/0/33)SW (G 2/0/35) -----------pc 1    100.1.1.1

                                                                                       T 1/0/50                        T 2/0/1

Pc1通过ftp传文件到pc 2，测试结果如下：

1、 使用电口对接，速率1g，pc间传输速率最开始112MB—》77

2、 使用光口对接，速率10g，PC间传输速率同电口，无拥塞丢包。

3、 不使用交换机，PC间直接传输，传输速率同上。

综上：感觉和交换机传输问题不大，现场是否直连也是一样的速率？如果是那就是tcp连接双方滑动窗口有关了。设备上是收到多少转发多少，除了特殊情况拥塞丢包。

测试过程如下：

测试设备：

[H3C]dis version

H3C Comware Software, Version 7.1.070, Release 6318P01

Copyright (c) 2004-2020 New H3C Technologies Co., Ltd. All rights reserved.

H3C S5130S-52S-EI uptime is 0 weeks, 0 days, 1 hour, 51 minutes

Last reboot reason : Cold reboot

Boot image: flash:/s5130s_ei-cmw710-boot-r6318p01.bin

Boot image version: 7.1.070, Release 6318P01

  Compiled Jul 01 2020 11:00:00

System image: flash:/s5130s_ei-cmw710-system-r6318p01.bin

System image version: 7.1.070, Release 6318P01

  Compiled Jul 01 2020 11:00:00

测试文档大小20G：

1、 当5130S-EI和sw使用电口对接时：

最开始是能跑到带宽的，但是最后也只是贷款的45左右。速率也由112MB/S降至77左右。

[H3C]dis cou ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     99         81612                --                --

GE1/0/17                     0           186                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]

[H3C]dis cou ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     77         63155                --                --

GE1/0/17                     0           528                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis cou ra in in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                      1          5750                --                --

GE1/0/17                     7          5783                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis cou ra in in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                      1          5750                --                --

GE1/0/17                     7          5783                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis cou ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     46         37212                --                --

GE1/0/17                     0           586                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]

[H3C]dis cou ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     45         36652                --                --

GE1/0/17                     0           644                --                --

2、 当5130S-EI和sw使用光口对接时，速率是协商到10G的：

最开始是能跑到带宽的，但是最后也只是贷款的45左右。速率也由112MB/S降至73.3左右

[H3C]dis coun ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     99         81625                --                --

XGE1/0/50                    0          7552                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     99         81625                --                --

XGE1/0/50                    0          7552                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     99         81625                --                --

XGE1/0/50                    0          7552                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra in in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                      1          7503                --                --

XGE1/0/50                   10         81624                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra in in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                      1          7503                --                --

XGE1/0/50                   10         81621                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     99         81617                --                --

XGE1/0/50                    0          7487                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     99         81638                --                --

XGE1/0/50                    0          7361                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra in in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                      1          7465                --                --

XGE1/0/50                   10         80601                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra in in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                      1          7465                --                --

XGE1/0/50                   10         80601                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]

[H3C]dis coun ra in in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                      0          3425                --                --

XGE1/0/50                    4         29389                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]dis coun ra ou in

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE1/0/1                     44         35771                --                --

XGE1/0/50                    0          3307                --                --

Overflow: More than 14 digits.

       --: Not supported.

[H3C]

[H3C]

[H3C-probe] reg switch 1 0 read 2b40174

Read Switch Reg 0x2b40174 SUCCESS  [data = 0x0]

31~28 27~24 | 23~20 19~16 | 15~12 11~8 | 7~ 4 3~ 0

---------------------------------------------------

  0000 0000  |  0000 0000  |  0000 0000 | 0000 0000

[H3C-probe]

3、 两台PC直接对接

1、确认现场是否直连也是一样的速率？如果是那就是tcp连接双方滑动窗口有关了。设备上是收到多少转发多少，除了特殊情况拥塞丢包。

2、如果只是单纯过交换机就会有传输速率慢，请排查设备是否存在拥塞。

3、如果设备无拥塞，请反馈诊断，测试过程进行分析。