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Traffic/QoS traffic shaping

We are running traffic on 10M ethernet with different classes of services. AF1=2M, AF3=3.2M, AF4=2M and EF=1.8M. DE=1M. While we overload the link with just AF1 traffic, the AF1 traffic shows 5M and DE shows 4M. However, as per settings, the AF1 was supposed to be twice the DE traffic. Also the link max'es at 9M, instead of 10M.

Can anyone suggest why is it behaving this way? Please comment.
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totaram
Asked:
totaram
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2 Solutions
 
Rick_O_ShayCommented:
QOS implementations usually allow for different amounts of bursting above the set rate when there is not other higher priority traffic to send as well.

As far as the 9M vs 10M is concerned you generally can't hit the theoretical maximum due to a number of things like TCP window size for example. The maximum rate you can achieve will also vary depending on the packet sizes and protocols used.
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SouljaCommented:
You will need to provide your qos configuration. You could be using qos methods that allow rate to exceed the configured amount, method such as bandwidth, shape, etc. Can you provide the configuration?
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totaramAuthor Commented:
One question:
If the DE=1, and no other is class of traffic is available, just AF1... should AF1 not get the priority over DE? Theoritically, it should be 9M of AF1 and 1M of DE.. right??
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SouljaCommented:
Depends on how the qos is configured. They could be guaranteeing the amounts you state, but then allocating a certain percentage to each class for the rest of the available bandwidth.

I would need to see the configuration to confirm this, but that is what it looks like.
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totaramAuthor Commented:
For an MPLS network, please let me know if this config would on PE router...
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SouljaCommented:
The QOS should be on the CE router.
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