Timestamps are captured on ingress inside the ASIC (always) and then you can choose via the CLI whether you want to keep them or not on egress. To enable timestamps on all frames that egress an interface, use this command:
Arista(config-if-etX)#mac timestamp <mode>
For more, see: https://eos.arista.com/timestamping-on-the-7150-series/
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