I have a situation where an inside lan is connected to our 7200 router via a GigE interface, but the outward facing link is 120k serial.
What I am trying to accomplish is apply QOS policies to the router to ALWAYS allow voice streams to have priority, and never drop packets, or build up latency. At the same time, there will be other data on the link, but it can be buffered or dropped depending on link congestion.
I am having problems implementing this. The only workable solution I found so far is to set up some ACL's which define VOICE, and DATA. I am rate-limiting the GigE inbound DATA rate, with a rate-limit statement. If it DATA conforms to the rate-limit, I pass the traffic, if not it is dropped.
Am I mistaken in thinking that if QOS is set up properly, the VOICE traffic should get put to the front of the line when it comes in? Even if there is a burst of DATA traffic, shouldn't the VOICE always get through with the higher priority?
Is there a way to achieve my goal some other way? (the relevant part of the config is attached.)