Hi CClemmer.
Sorry. Its been a busy 2 weeks and I have finally gotten around to testing this.
To refresh; I want to prevent 10.0.0.0 255.0.0.0 from seeing 172.60.0.0 255.255.255.0 and vice versa.
On my S2500 MAS which is my router, I ran the following commands:
(Aruba-DataCenter-1) (config-ext-admin-ACL)#deny any 172.60.0.0 0.0.0.255 10.0.0.0 0.255.255.255
(Aruba-DataCenter-1) (config-ext-admin-ACL)#deny any 10.0.0.0 0.255.255.255 172.60.0.0 0.0.0.255
But, when I run Advanced Port Scanner, from 172.x.x.x, I can see the IP's, MAC addresses and Manufacturer of the machies on 10.x.x.x.
I'm not sure what is going on.
Any other advice, I will gladly try.
Thank you.