You'll need to configure qos on both of your routers. Apply the policy outbound on both interfaces.
access-list 101 permit tcp any any eq 3389
access-list 101 permit tcp any any eq 3399
class-map match-any Policy
match access-group 101
priority percent 10
int fa0/0 (wan interface)
service-policy output Policy
Do this on both sides. The problem with giving priority is 2 fold. On one hand, you're guaranteed a minimum of 10 percent of your total reservable bandwidth. Total reservable is 75% of your link speed. If you have a T1, your link speed is 1544 with 1158k usable. Ten percent of that would be 115k that you would be guaranteed for this traffic, BUT it's also your maximum in times of congestion because LLQ also polices the traffic at that guaranteed rate to mitigate starvation of other queues.
Another way that you could do this is to give a bandwidth guarantee and then shape the traffic in the same queue. This would give the same effect, but you would have a little more control as to how high of a ceiling to give:
bandwidth percent 10 ( minus any existing priority queues; if none exist, then you're back at 115k)
If possible, we would like TCP 3389 & 3399 traffic to have priority over all other traffic - and use up to 50% of the bandwidth. But we would also like the other traffic to be able to use 100% of the bandwidth if no TCP 3389 & 3399 traffic exists.
Will this do what we need it to do, if applied to the outside interface of both Routers?
it would do what u said there, but 50% for priority is somewhat a very high value, keep in mind that priority traffic not only uses up to 50% of the bandwidth, but its also gets time sensitive and low latency service, which may have great negative impact on the other trfic flows.
depends on ur equipment, you may need to add the class-default under the policy-map:
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