PTP Shaping on RB230 v2.8

Hello,

I am trying to setup my RB230 to shape (drop or limit) all down/up PTP traffic on a segmented network. I want the routerboard to be a pass-through bridge and only filter or shape PTP traffic. My problem is a have multiple subnets that will be passing traffic through the routerboard. Is there a default route for filtering I can apply? I have never done this before, so I am pretty much lost.

Any help would be great.

Thanks,

Jahz007