Meru Technical Note - What is loss and retry percentage?
What is loss and retry percentage?
Scope
KB ARTICLE TYPE: Design
RELATED PRODUCTS: N/A
RELATED SOFTWARE VERSIONS: N/A
KEYWORDS: Loss, Retry
Solution
When a packet is sent to a device, the sender expects an ack for that packet, to be considered a successful transmission/exchange.
If the sender does not receive an ack for the original packet, the sender will resend the packet up to three times, namely, retry# 1, retry#2 and retry#3.
If the sender does not receive an ack after the third retry attempt, it is counted as Loss. So loss counter +1. Hence, loss counter/total packets sent *100 will be your loss percentage.
If, the sender receives an ack on, say, retry#2, the loss counter is not incremented; Retry counter is incremented, or in this case, the retry percentage on that packet would be 1/3*100=33%. Since one retry was made without an acknowledgement, and on the 2nd retry, an ack was received, making it a valid exchange.
