So one comment here on ingress vs egress. The type of forwarding a switch does, store & forward vs cut through can effect where you see the errors. In S&F the s

So one comment here on ingress vs egress. The type of forwarding a switch does, store & forward vs cut through can effect where you see the errors. In S&F the switch buffers the full packet before it switches it out. If the FCS is off at that point it drops the packet. In CT the switch will start forwarding a packet before it has received the full packet, so a corrupt packet will be seen on the other side even several hops away if the full chain is CT. Some switches do some magic on the fly and if they ID the packet as bad sometime before the final data they will purposely corrupt the packet so the other side see it. To be clear I am speaking in general terms and there are more details here. Kalpana did the first CT switch back in 90s. Cisco picked them up. CT sort of died there until Fulcrum ASICS in the early 2000s. Arista’s 71xx line used their Bali chips. CT hit mainstream again with the release of the Broadcom Trident which was used by every major player (Arista 7050, Cisco Nexus 3K, Juniper QFX, etc.)