I'll start by saying I'm not a network admin, just thrown into this on.
I have a 1234 L3 lite switch that I'm trying to use to get to subnets to talk together. Here is what I have
Adtran 1224 L2 switch
192.168.101.9 gateway 192.168.101.1 (ASA)
Adtran 1234 L2 switch
172.21.11.9 gateway 172.21.11.3
Adtran 1234 L3 Lite switch
172.21.11.3 gateway 192.168.101.1 (Same ASA)
I need to use the router to allow both networks to see each other using the 16 static routes. the 172.21.11.0 network is being built and has never connected to the Internet yet. I have Googled but nothing yet founds has this setup. So let me know if there is more hardware that needs to be bought, or what the routing table might look like or whatever. I'm stumped at this point.
The 1234 switch should have one port in as an access port in a VLAN connected to the 1224 switch. This VLAN interface should be configured with an IP address in the 192.168.101.x subnet. The default route on the 1234 switch should be the ASA of 192.168.101.1. (ip route 0.0.0.0 0.0.0.0 192.168.101.1)
Another VLAN on the 1234 switch should have an IP of something in the 172.21.11.x subnet. I'm not sure if your intent is to use .9 or .3 here, but .1 might be more appropriate.
Hosts in 172.21.11.x should have their default gateway pointed to the address of the 172.21.11.x address of the 1234 switch and connected to ports on that switch configured as access ports in that VLAN.
The ASA needs a static route to 172.21.11.0/24 pointed to the 192.168.101.x address you assign to the 1234 switch.
The IP address on the 1224 switch doesn't really matter as it isn't participating in IP routing.