We are seeing small but incrementing amounts on ignored input errors on our 2821 routers. The are incrementing on both the WAN and LAN interfaces (both are ethernet interfaces). I would like to understand possible causes. The error rate is extrememly small @ approx 0.0003% however as we run HD video over these WANs I would like to understand if these could be video packets getting dropped. Is there a Cisco best practise or accept drop rate for these type of errors?