The ACE performs high-performance server load balancing (SLB) among groups of 6504-E switches, based on Layer 3 as well as Layer 4 through Layer 7 packet information. The ACE can also terminate and initiate SSL-encrypted traffic which allows the ACE to perform intelligent load balancing while ensuring secure end-to-end encryption.This product is Cisco ACE20 6504 bundle with 4Gbps Throughput License.