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Traffic shaping/QOS on a 2651

James asked
Medium Priority
Last Modified: 2008-03-17
Traffic shaping/QOS on a 2651

I have a single T-1 from our Corp. office to our datacenter.  With about 7 users in the corp office.  Occasionally.. one of us needs to do large down loads or run network intensive applications & it brings everyone to their knees.

Is there an easy way to configure traffic shaping oun our 2651 to limit the maximum bandwidth a singe user can grab?  Say.. burst for 30 seconds then user the max size.  I found the below on Cisco website, but not sure if it would help us.

If you need to restrict the amount of load the system can induce both outbound and inbound, and therefore the total load the system can induce, configure traffic shaping on both the inbound and outbound interfaces, as in the following example:
interface <serial interface or sub-interface>
 traffic-shape rate 64000 8000 46320000
interface <LAN interface>
 traffic-shape rate 64000 8000 46320000

Any suggestions would be very appreciated.

Thanks - James
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Generic traffic shaping will also let you limit traffic for certain IPs or subnets via ACLs. eg:
  Always limit traffic to/from these IPs - & to 384 kbps, while all others are unlimited:

access-list 100 permit host any
access-list 100 permit host any
access-list 100 permit any host
access-list 100 permit any host

int <LAN interface>
 traffic-shape group 100 384000

And since you're using extended ACLs above, it gives you flexibility so you could limit an entire subnet, just limit TCP traffic, etc.


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If I wanted to do it by subnet:

access-list 100 permit host any
access-list 100 permit any

int <LAN interface>
traffice-shape group 100 38400

Would this limit only active connections?

Thanks... James
All connections, not just active ones.
  The second you apply traffic-shaping to the interface, any in-progress connections (or new ones) will be affected, as long as the traffic matches the ACL.  Start a large download/upload on a host, then apply shaping to the interface, & watch the throughput spiral downwards until it conforms to the max allowed rate.

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