Is it possible to configure a router to use QoS to just have one protocol be a priority over everything else? I want to have RDP take precedence over everything without having to limit all non-RDP traffic along with making RDP the priority.
Here is what I have so far:
ip access-list extended RDP permit tcp 172.16.23.0 0.0.0.255 any eq 3389
class-map match-any RDP match access-group name RDP
Is there a way to make a policy use the RDP class-map to give it precedence over all other traffic without specifying all the other traffic?
When you apply the class map under a policy map do configure the preference to RDP using Priority command followed by the bandwidth you wish to allocate for RDP during congestion.
If you are having voice traffic in your network i wont suggest to go ahead with priority instead you can make use of bandwidth command followed by the bandwidth you want to reserve/allocated to the RDP traffic.
If I use the priority percent 90, do I have to specify the total available bandwidth somewhere?
policy-map Inbound class RDP priority percent 90
Is that enough? This is on a T1 so do I need to put bandwidth 1544 on the serial interface?
You should set the bandwidth on the T1 to be an accurate reflection of it's actual bandwidth.
Also you cannot usually allocate more than 75% of the bandwidth because the remaining 25% is used by the router for it's own traffic, best effort etc.
Finally you don't need to specific the overall bandwidth because it is 100% but your priority percent 90 is telling the router to use 90% for RDP. Even if you used priority percent 75 this could severly impact on non-RDP traffic. Are you sure this is what you want to do ?
RDP is their most important protocol. Everything else is secondary. If they need to browse the internet, they do it through their RDP sessions so I don't care about making web traffic crawl. Would you suggest maybe setting the priority percent to 65?
Just be aware that it might not just slow to a crawl, it might just stop working altogether. The percentage you reserve with the priority command should be based on how much RDP traffic needs to be prioritised in periods of congestion. It's not just a random figure.
Thanks for all of the help everyone but it appears to be a moot point. According to the router I can't apply the policy to the inbound traffic because Class-based weighted fair queueing can only be used on outbound traffic. Guess I will be stuck using policing to make the policy work.
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