I have a question about "priority percent" command.
I want to deploy QoS at customer network to make sure voice traffic with DSCP46 and be treated with highest priority. All the packets makred with DSCP 46 will be put into LLQ on Cisco 3845 router, and then sent out without any latency.
customer connected 10Mbps lease line with a fast ethernet port of Cisco3845, so normal LLQ configuration should not be functional even 20Mbps mixed egress traffic traveling through the lease line, that is because the fa interface is not congested, LLQ configuration is useless in this enviroment.
I replaced the QoS configuration on Cisco3845 router with hiberarchy qos:
priority percent 100
shape average 10000000
Hiberarchy QoS configuration shaped the interface bandwidth to 10Mbps, and permit voice traffic can occupy up to 100 percent of the 10Mbit bandwidth.
I did a test to check if I can change the max bandwidth which voice can occupy, for example, degrease the percent to "40%", and then I used Smartbit, which is traffic generator and analyzer, to inject 2 flows into the WAN link, one marked with DSCP46, and another marked with DSCP0.
The result shows me that percent of bandwidth of voice traffic is not consistent with the setting in "priority percent" command, I mean if I change the setting to 40%, but indeed, the percent of banwidth which voice traffic can occupy is more than 40 percent, it's about 63%. If I change the setting to 1%, the voice traffic can still used around 40% bandwidth.
My question is if the setting of "priority percent" is the real percent(max value) which high priority traffic can used.