What is the decision criteria for selecting a layer-3 switch vs a Router? Is there any document that gives comparison.
OK.. I will be more specific. I am planning to upgrade a 3825 router to a 7206 VXR NPE-G1 or to a 3845 ISR OR even a layer-3 switch. Reason being this router would support additional VOIP traffic as well as some critical applications (Citrix etc.).
Then the idea popped why not install 3750G Enterprise or any other layer 3 switch which would also give additional gig ethernet interfaces as well as take care of layer-2 connectivity.
Now the question is what could be the performance criteria to prefer one device over the other keeping in mind the VOIP traffic requirements? There are currently 120 remote call centre agents and the maximum interface utilization is 18Meg. This can go up to 250 agents in near future.