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Spirent KB Article
Doc ID: FAQ13307
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Spirent TestCenter: What is the capability of auto-negotiation on 10G Base-T, 40GBASE-CR4, and 100GBASE-CR10 modules?
FX/MX-10G-C2|4|8 10G Base-T modules
1G operation is fully supported
1G mode can auto negotiate to 1G or 10G but can not advertise both at the same time
Link will not be established when a 10GBase-T module (MX-10G-C or FX-10G-C) is re-configured to advertise both 10G and 1G operation (the default is to advertise 10G) and the link partner only supports 1G operation.
If the link partner only supports 1G operation you must configure the Spirent port to only advertise 1G operation.
Dual speed autonegotiation will be added into the next Spirent TestCenter Release, v4.30.
MX-100G, MX-40G, FX-100G and FX-40G
40GBASE-CR4 and 100GBASE-CR10 auto-negotiation is not supported
Workaround: Disable auto-negotiation on the device under test
Product : Spirent TestCenter,FX,MX