question

AswinAS avatar image
AswinAS asked AswinAS edited

Unable to select "Insert FCS error" ?

Hello All,

I am trying to send packets with FCS error.

Default packets are L2/L3 packets are sent without any error.fcs.png

Whenever I select the option "Insert FCS error", it doesn't send any packets.

Always showing the following error messages.

6/15/2023 15:37:15 .9 Error Other Start Traffic 10 failed with error: There were 1 validation error(s); aborting apply.

Stream block (StreamBlock 22): The port (Port //1/1) does not support streamblock FCS error insertion..

Kindly let me know how to resolve this issue.

Thank you.

Spirent TestCenter (STC)streamblockl2validation errorsl3
fcs.png (6.2 KiB)
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3 Answers

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mnakamura avatar image
mnakamura answered AswinAS edited

Hi @AswinAS, I'm surprised that you are able to select inject FCS in the GUI with v5.22. This should be disabled due to virtual chassis doesn't support it. I also tested in our latest 5.41 and I'm not able to set a check mark in the inject FCS check box. Also, here is an article from our Knowledge Base.

  • This feature is not supported on Spirent Virtual.
  • When STCv's Generator generates an ethernet frame, it has an FCS of all 0s.
  • STCv relies on the hypervisor's NIC to calculate and fill in the FCS.
  • This is why STCv does not support injection of FCS errors.
    • The check box has been disabled since v4.36.
    • Prior to v4.36 the check box is enabled but it will not inject any errors

But I suppose the bottom line is that it is not supported with Virtual chassis.

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AswinAS avatar image AswinAS commented ·

Hi @mnakamura,

Thank you so much for your prompt and detailed explanation on this.

Yes, It's allowing to select the FCS error inclusion and fails at the validation phase.

I will try to find other alternatives for inserting FCS error then.

Thank you.

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mnakamura avatar image
mnakamura answered

It may depend on the module and application version. What is the name of the module and the version of the TestCenter application?

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AswinAS avatar image
AswinAS answered

Hi @mnakamura,

Thanks for looking into this.

I am using STC 5.22 and trying to send packets to a virtual chassis.

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