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Spirent KB Article
Doc ID: FAQ10700
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Spirent TestCenter: How many bytes of headers can be inserted into a frame?
Spirent TestCenter v4.97
Max frame template sizes (aka how many bytes of headers you can insert).
400G - 128 bytes
200G - 128 bytes
100G - 480 bytes
50G - 480 bytes
When you hit this limitation you will see an error similar to:
Error encountered while sending message to configure stream block(s). Stream block (Ipv6:port2:1): Invalid input parameters: Can not allow frame content size more than 128 bytes.
Spirent: 05:00:34.468 ERROR - Error encountered while sending message to bind load profile(s) to stream block(s). Invalid input parameters: Cannot find stream block id 100569 in database.
The HYPERMETRICS DX 32-PORT 10 GBE TEST MODULE also does NOT support greater that 480 byte HEADER size and there are no plans to implement in the future.
The frame length of the packet is different from the frame content size from the perspective the HW.
Frame content size is the size of defined headers in the stream block configuration (e.g., ethernet, IPv4, custom header).
It doesn’t include HW generated background fill.
You can send a packet that is a frame length of 8100 bytes but the frame content is only Ethernet and a custom header with only two bytes of data.
The Ethernet header and the two bytes of custom header data is well within the 480 byte frame content size limit.
As a workaround it is suggested to use background pattern, as data is all FFFFs however this does not meet all config requirements.
If work around doesn't meet the configuration requirement, please use a different module. The DX module simply cannot be used for these situations.
Product : Spirent TestCenter,PGA,DX