I have a PC that's on the 10.30.46.199 network that's passing data to a PC on the 10.35.44.3 network.
I attached a drawing that shows the traffic direction.
The routing is done on the 2801 (our core RTR).
Is there a way I can get the traffic to stay in the Cisco 3750?
In other words, since both PCs are on the Cisco 3750, can't the traffic from PC #1 destined to PC #2 go to the Cisco 3750 and then routed to the switch port that PC #2 is on?
Any thoughts or suggestions?
The other posters have already described how to enable routing on the 3750 and that you likely will need to change the gateway for the subnets connected to the 3750.
Assuming the 2801 was only being used for LAN routing, you'll likely should see a speed improvement for large data transfers between the two directly connected networks and will no longer need the 2801. However, if there's other routing that was being conducted via the 2801 (e.g WAN routing), just enabling routing on the 3750 may break communication between the 3750 and 2801 unless other measures are implemented.