VIAVI TestCenter: Why do I see FCS errors on the STC GUI Port counters when receiving IEEE802.1QBU preempted fragments?
Knowledge Base - FAQ
VIAVI TestCenter: Why do I see FCS errors on the STC GUI Port counters when receiving IEEE802.1QBU preempted fragments?
• For Preemption packets, Initial Frag, Continuation frag will have mCRC calculated which is different from FCS.
• STC calculates FCS based on each stream since it cannot calculate mCRC.
• We can ignore Rx FCS Error Frame count values for Preemption streams.
• Preempted fragments is validated using TestCenter IQ, Qbu results
• Invalid Fragment Count should represent bad mCRC.