Hi, i have the current setup:
LAN1: 192.168.6.0/24 Interface: ether2-Core
LAN2: 192.168.7.0/24 Interface: ether3-Family
LAN3: 192.168.5.0/24 Interface: ether4-Core-Cisco
WAN: ISP DHCP Interface: internet-ether10

My Internet Speed is:
Download: 6.1mbps
Upload: 1.5mbps

I followed the wiki documentation, but was unsuccessful
So, help:

I want to set my QoS tree like this: (QoS on Internet)

I want the LAN1 on ether2-Core to have high priority, unlimited speed. (Because my isp is always upgrading the speed without notification)
I want the LAN2 on ether3-Family to have normal priority, but i want them to have limited download: 2mbps, upload: 0.4mbps
I want the LAN3 to have the available bandwidth left.

Conditions:
1) LAN1 must not slow down LAN2, so if LAN2 requires internet, LAN2 will have available 2mbps only.
2) If LAN2 is not using the internet then LAN1 will have full bandwidth.
3) LAN1 must not have any internet speed limitation (Because i am always monitoring the isp speed)

So please, help.
Thanks!

Hello!
Try this:
/queue simple add name=ISP target-addresses=0.0.0.0/0
/queue simple add name=LAN2 priority=6 target-addresses=192.168.7.0/24 max-limit=2M/400k limit-at=2M/400k parent=ISP
/queue simple add name=LAN1 priority=7 target-addresses=192.168.6.0/24 parent=ISP
/queue simple add name=LAN3 priority=8 target-addresses=192.168.5.0/24 parent=ISP

Hello!
Try this:
/queue simple add name=ISP target-addresses=0.0.0.0/0
/queue simple add name=LAN2 priority=6 target-addresses=192.168.7.0/24 max-limit=400k/2M limit-at=400k/2M parent=ISP
/queue simple add name=LAN1 priority=7 target-addresses=192.168.6.0/24 parent=ISP
/queue simple add name=LAN3 priority=8 target-addresses=192.168.5.0/24 parent=ISP
#fixed the limits 400k/2M first upload then download.

@antkamidiv Thanks!, Karma +1 question:
if there are 3 clients in LAN2 (The one that have 2M) the connection fixes per ip? ex:
192.168.7.100 666K
192.168.7.101 666K
192.168.7.102 666K
or do i have to setup PCQ in Queue Type?, if so how?

The bandwidth isn't divided into equal parts. You need create PCQ queues for incoming and outgoing traffic.
/queue type add name="Download" kind=pcq limit=2M pcq-classifier=dst-address
/queue type add name="Upload" kind=pcq limit=400k pcq-classifier=src-address
/queue simple set [ find name="LAN2" ] queue=Upload/Download

The bandwidth isn't divided into equal parts. You need create PCQ queues for incoming and outgoing traffic.
/queue type add name="Download" kind=pcq limit=2M pcq-classifier=dst-address
/queue type add name="Upload" kind=pcq limit=400k pcq-classifier=src-address
/queue simple set [ find name="LAN2" ] queue=Upload/Download

Thanks karma +1