Prioritize Network traffic and shape it to a limit

[Network Operations Centre Injazat]

We are trying to prioritize WAN traffic to the file server which located at remote site.

We have to prioritize the traffic but not reserve bandwidth for this traffic. Our WAN bandwidth is 100 Mbps.

What are our options?

While prioritizing we don't want this traffic to use the whole bandwidth. So we have to cap it.

[Leo Laohoo]

What is the model of router?

[Georg Pauwen]

Hello,

here is a very generic QoS policy

access-list 101 permit ip any host ip_address_file_server
!
class-map PRIORITY_CLASS
 match access-group 101
!
policy-map PRIORITY_POLICY
 class PRIORITY_CLASS
  priority level 1
 class class-default

  shape average 100000000
  fair-queue
!
interface GigabitEthernet0/0
description ISP Link
service-policy output PRIORITY_POLICY

[Joseph W. Doherty]

Georg, BTW, your suggested policy only shapes class default, which could allow it, with the PRIORITY_CLASS, to exceed 100 Mbps. Of course that presumes the 100 Mbps is a logical cap, not an interface bandwidth cap. (Also, of course, if the interface is limited to 100 Mbps, we wouldn't need the shaper.)

Also, without some bandwidth limit being defined for the LLQ class, I'm unsure how much bandwidth PRIORITY_CLASS might consume.

[Joseph W. Doherty]

Your options depend on your equipment and your physical network; which you need to further explain so that suggestions might be offered.

Further, you'll also need to better define what you want to accomplish. For example, what do you have in mind when you write "prioritize" and not using all the bandwidth doesn't always imply a need to "cap" traffic. If fact, all you might need is some variant of fair queue (if supported by your devices) for all your traffic.

Lastly, keep in mind that for QoS to be effective, you need to consider both directions, i.e. both to and from your server.