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How to check UDP packet l...

How to check UDP packet loss on switch

Latest reply: Dec 31, 2018 14:53:22 640 12 13 0
display all floors #1

Problem Description


  • Port 1 and Port 4 of Huawei switch is connected to CPE1 and CPE2.

  • For the application to work properly, bothCPE1 and CPE2 send out PDUs at every 2-second interval to headend controller, and ever 3-second interval towards the branch.

  • The PDUs are sent out on Port 4790 as UDP packets.

  • We are facing frequent disconnection inapplication.

  • Can you please diagnose and confirm whether the PDUs are getting forwarded or blocked on the switch.


Problem Analysis


As my checking, the switch is just an L2 switch


And there are no mac-address flapping records on this switch.


=======================================================================


  ===============display mac-address flappingrecord===============


=======================================================================


Info: The MAC address flapping record does not exist.


 


And I want to know whether there is ip-address for the UDP packet? If yes, we can do traffic statistics to check; if not, we need capture packet to confirm it is forwarded or blocked by switch.


Root Cause

this is just customer query


Solution Description

Tell the customer how to test the problem:

whether there is an ip-address for the UDP packet? If yes, we can do traffic statistics to check; if not, we need capture packet to confirm it is forwarded or blocked by switch.

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Helpful (13) Favorite(0) Share Report
Skay
Created Dec 22, 2018 05:51:57 Helpful(0) Helpful(0)

hi author , can you give us some detail steps for commands , so that i can make the same test in the lab or customer live network in the future .
If yes, we can do traffic statistic to check; if not, we need capture packet to confirm it is forwarded or blocked by switch.
also how to do traffic statistic and capture packet ?
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Finn92
Created Dec 22, 2018 09:45:50 Helpful(0) Helpful(0)

i think skay saies right , we need more knowledge so that we can troubleshooting for proving our device is normal .
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wissal
MVE Created Dec 22, 2018 17:49:52 Helpful(0) Helpful(0)

Detailed description of the problem and how to solve it, helpful.
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yechao99
Created Dec 25, 2018 02:46:01 Helpful(0) Helpful(0)

helpful for us ,next time will be pass easy
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GongXiaochuan
Created Dec 26, 2018 01:54:55 Helpful(0) Helpful(0)

for customer issue about "Can you please diagnose and confirm whetehrthe PDUs are getting forwarded or blocked on the switch" , could you please share more details about how to check this
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Good Good Study Day Day Up
Torrent
Created Dec 28, 2018 03:48:44 Helpful(0) Helpful(0)

tell customer how to test the problem:

whether there is ip-address for the UDPpacket? If yes, we can do traffic statistic to check; if not, we need capturepacket to confirm it is forwarded or blocked by switch.

thanks for shaing
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lizhi94
Created Dec 29, 2018 02:00:05 Helpful(0) Helpful(0)


the phenomenon is so strange i also want to know
Port 1 and Port 4 of Huawei switch isconnected to CPE1 and CPE2.


•For the application to work properly, bothCPE1 and CPE2 send out PDUs at every 2 second interval to headend controller,and ever 3 second interval towards the branch.


•The PDUs are sent out on Port 4790 as UDPpackets.


•We are facing frequent disconnection inapplication.


•Can you please diagnose and confirm whetehrthe PDUs are getting forwarded or blocked on the switch.

  • x
  • convention：
SupperRobin
Created Dec 29, 2018 03:28:21 Helpful(0) Helpful(0)

If the IP addresses of ARP packets on the control plane match the IP addresses in a basic or advanced ACL, these ARP packets can also be captured.
When the CPU usage is above 80%, executing this command will keep the CPU usage increasing.
The packet capture configuration is not saved in the configuration file, and becomes invalid when packet capture is complete.
Different packet capture instances cannot be executed simultaneously. That is, a new packet capture instance can be executed only when the previous one is complete.
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littlestone
Created Dec 29, 2018 11:11:59 Helpful(0) Helpful(0)

UDP is the abbreviation of User Datagram Protocol. Its Chinese name is User Datagram Protocol. It is a connectionless transport layer protocol in OSI (Open System Interconnection) reference model, providing transaction-oriented simplicity.
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