If you are running in directed mode all traffic is handled by the MSFC and not the PFC ie. it is software switched and this can put a large load on the switch. This is where a dedicated load-balancer such as the ACE module can be used because all the load-balancing is then handled in hardware by the module itself.
I am running in directed mode (i know the "worst" mode, i am doing server natting)
BTW . I found the reason for the high CPU:
One of the real servers is already taking 30Mbps of traffic today (from other systems). Once i put my virtual server in "inservice" the switch punts all this traffic to CPU..auch ! Even if no traffic is seen to the vserver ip
Proof: the second real server is taking 0% of load currently. When i removed the busy one from the config -> my CPU doesn't hit 100% anymore and it works. During a heavy download, CPU increased to 40% (single session).
Conclusion: 30Mbps is too high for SLB with NAT on SUP720 :-)
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