You can reach interfaces that are directly connected on the Cisco routers.
It seems that static routing is not working, to be able to reach the networks connected on the ZS (LABS). So my suggestion is to enable RIPv2 on ETH00 of ZS and LAN interface of Cisco 1 (ask it from the netadmins).
Static routing on the CISCO 1, have this route:
ip route 192.168.0.0 255.255.0.0 192.168.0.1
I’m asked about activate RIPv2… I’m waiting…
Then maybe Cisco 2 doesn’t have a correct gateway for 192.168.0.0/16, which should be the wan interface of Cisco 1.
CISCO 2 has a route for all 192.168.x.x/16 to go throught the WAN line to the WAN interface of CISCO 1.
And CISCO 1 has a route for all 172.16.x.x/16 to go throught the WAN line to the WAN interface of CISCO 2.