I am getting confused with the input output rate of an interface, how can my input rate be less than my output rate? example below:
Load-Interval #1: 30 seconds
30 seconds input rate 11246640 bits/sec, 20009 packets/sec
30 seconds output rate 1650525584 bits/sec, 136182 packets/sec
input rate 11.25 Mbps, 20.01 Kp; output rate 1.65 Gb 136.18 Kb
Load-Interval #2: 5 minute (300 seconds)
300 seconds input rate 11894688 bits/sec, 21154 packets/sec
300 seconds output rate 1785522904 bits/sec, 147285 packets/sec
input rate 11.89 Mbps, 21.15 Kpps; output rate 1.78 Gbps, 147.29 Kpps
Joseph presents a good explanation based on the possibility that data ingress is one interface and data egress is on a different interface. I would suggest another explanation which can also be considered. Think about the possibility that a packet inbound is from a client and is a request to a data base server for information. The request was 1 packet. The response from the data base server has lots of data and it takes 10 packets to transmit it all. So at that point we have a 10 to 1 difference in the output to input rates.
Certainly my explanation does not impact your explanation. Both are valid explanations of why the input rate may be less than the output rate for an interface. Perhaps we understand some terms differently. I would think that the term asymmetric would apply more to the explanation of input on one interface and output on a different interface. My explanation is perhaps more about balance, where one input received may generate many output responses sent. But certainly both are valid explanations of the original question about whether it is legitimate to have input rate less than output rate for an interface.
I interpreted your comment as attempting to address the possibility that some readers might think that one of our explanations could impact the other. Both are quite valid and they are independent of each other. As you and I have learned there are frequently more than one way to solve a network problem, and more than one way to explain a network behavior. And I believe that if we thought about it some more we could probably come up with another reason or two for this behavior.