I am hoping that someone could help me out with a rather simple QoS config for a Cisco 3845 with a single T1/CSU card in it.
I have no VoIP running through this interface. I was hoping to put some limits on how much web and other traffic is used on the inbound side of the interface. I would like it so that the interface drops any HTTP(or HTTPS) packets when it has reached >90% capacity.
My problem is that akamai technologies servers aren't closing sessions properly and they keep hammering my T1 (even after my client is disconnected). So that has resulted in me adding a lot of deny xxxxx in my Inbound ACL. If I could just QoS that interface and say that no more than 90% of my bandwidth can be HTTP(S) traffic shouldn't that prevent me from adding all of these servers to my ACL? At least a little bit?
I really am just trying to prevent one or two IPs taking up all of my inbound bandwidth. There really aren't too many other protocols on that line that I should be worried about other than UDP 53(DNS) and VPN traffic (VPN 3005 using IPSec is behind that router).
You are talking about "inbound bandwidth". Are the servers at the other end of your T1? Then the harm is already done, when the packet arrives at your router, as the bandwidth to transport the packets across the T1 is already taken. I would rather suggest in this case to have an outbound policy to prevent the packets from being transmitted.
As such a simple queueing configuration should be sufficient, like
class-map match-any noWeb
match not protocol http
match not protocol https
bandwidth percent 10
policy-map output Queueing
This will guarantee at least 10% of the interface bandwidth to the rest of the traffic. You may want to adjust the percentage setting for optimum results.
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