Cisco ACI Multicast and Ftag tree

[Va.8427]

Hi there

Based on the latest Cisco documentation about ACI, We know :  "There are 16 FTAG trees but only 12 trees are used for user traffic".

I don't understand this given number. why 12 or 16 (both of these numbers are vague to me)

Is this number regardless of the number of spines? 

[Va.8427 · Accepted solution]

I got it :) ... maybe it is very simple and I was just confused.

This number of Ftag trees is defined in current version of ACI and the ftag IDs will be divided between Spine switches. So traffic will be load balanced as best as possible.