We currently have a 2Mbit ATM connection between two of our sites. A couple of times per week, it seems that the whole bandwidth becomes consumed by individual connections, wether it is a Server updating its database or a user doing a big file download. This clogs up the link and makes it nearly unuseable by other users.
What would be the best way to combat this. Would it be to set-up rate limiting so each connection can only use x% of bandwidth or is there a better solution.
I suggest you setup CBWFQ on the link so that different applications are guaranteed certain percentages of your PVC bandwidth. The point of using a queueing discipline like CBWFQ is to ensure a fair distribution of traffic between different classes of traffic (as defined by you) in the event of congestion.
An example follows:
class-map match-all realtime
match ip precedence 6
class-map match-all interactive
match protocol citrix
class-map match-all bulk
match access-group 10
interface ATM2/0.32 point-to-point
ip address x.x.x.x x.x.x.x
vbr-nrt 4000 4000 1
service-policy output OutPolicy
Ok, there are a couple of things to note here:
- the class-maps are a classification mechanism. You can match on a wide variety of things such as ACLs, IP precedence, input interface etc... If you can specify a bit more details on the traffic you want prioritised, we can help you with formulating those
- the bandwidth statement within the policy-map provides a minimum bandwidth reservation to all your classes. If the interface is not congested, these classes can use up to the full interface bandwidth.
You should see a dramatic improvement once you apply this on both sides of the link.
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