On my 2611XM (c2600-advsecurityk9-mz.123-11.T2.bin) with no vpn hardware module, my cpu is very overloaded due to the encrypt proc.
I know that the solution is to upgrade this box (or to purchase a vpn module). But I would like to know if there is any tuning to decrease the cpu waiting for this upgrade ?
For the moment, it has three gre/ipsec tunnels to reach other offices in my company. The transform set is esp-3des esp-sha-hmac .
Do you have any idea how i can decrease the cpu like changing the encryption algorithm ?