following secario: A MX480 with MPC3e 3D NG Linecards.
I have a new Layer2 Access provider that is providing Layer2 services between 100 and 1000MBit/s. My connection zu this services are a 10GE E-NNI interface.
This provider is policing the traffic hard to the service bandwidth, allowing 60kB of burst, independent of service bandwidth.
Here comes my struggle: The shaper on the MX Platform has a minimum burst of about 1,8ms, so you can't implement a real "zero Burst" shaper here. There are ways of reducing this minimum bust by reducing the queues on the FPC ... i'm in contact with JTAC about this. But i don't think that this will solve my issue.
With this 1,8ms i'm able to stay within my provider's contract for services up to about 500MBit/s, but on service bandwidths of 600MBit/s and above the Juniper is not able to stay within the 60kB due to the minimum Bust of 1,8ms.
In my understanding i have to switch from a CIR based approach to a PIR based where i configure a CIR that is quite below my provider's CIR, and have to tune my burst limits up until a point where i still comply to the limit of my provider's PIR.
On i Cisco Box i would switch from a "shape average" configuration to a "shape peak" configuration with something like an average rate of 50% and a target rate of 100% of my provider's CIR.
Can anybody tell me the approach to solve this on a Juniper? I'm missing some information about the token refill rate of a Juniper shaper, how often can i access these Burst tokens i configured?
Thanks for your support and any comments here!