In reply to Andrew.

Hi Andrew,

It is true that the F3 series integrate a lot of the M Series functionality. However, the M Series modules still have some unique value in terms of larger table sizes (FIB, ACL, MAC), Full Netflow support, and MacSec on all ports. Further, there are some interface types only supported on M series (Native 1G Copper/Fiber, X2 optics, etc).

As for BiDir PIM, we currently support this on the M series and are investigating whether we will add software support on the F series. The F3 does have hardware support for BiDir.

Hope this helps.
Jeff