I have got 2621 router with the following version of IOS:
I have got two subnets created as primary and secondary under the LAN interface of the router. As we got older version of switches I've got this limitation and these subnets need to be under a singla VLAN. This interface is the gateway for the users of both the subnets in the LAN. Now if there is any huge amount of transfer among these two subnets the CPU utilization is growing rapidly high. We enabled ip cef, but still the problem exists. I can't afford to purchase an EMI switch and convert the L3 functionality(i.e, the user traffic to hit the switch rather than hitting the router directly). Any suggestion in this case?
Is the IOS a problem?