WAE deployments can be very significantly simplified and scaled up, when using a new innovation from Cisco. The new innovation is called Intelligent Traffic Director (ITD). ITD is much superior than WCCP and provides much higher scalability, reliability, availability and ease of deployment.
ITD (Intelligent Traffic Director) is a hardware based multi-Tbps Layer 4 load-balancing, traffic steering and clustering solution on Nexus 5k/6k/7k series of switches. It supports IP-stickiness, resiliency, NAT (EFT), VIP, health monitoring, sophisticated failure handling policies, N+M redundancy, IPv4, IPv6, VRF, weighted load-balancing, bi-directional flow-coherency, and IPSLA probes including DNS. There is no service module or external appliance needed.
ITD provides order of magnitude CAPEX and OPEX savings for the customers. ITD is available on Nexus 7000/7700 series in NX-OS 6.2(8) or later. It is available for demo/EFT on Nexus 5k/6k. ITD is much superior than legacy solutions like PBR, WCCP, ECMP, port-channel, layer-4 load-balancer appliances.
Here are some recent blogs about this technology :
http://blogs.cisco.com/datacenter/content-routing-traffic-steering-and-load-balancing-via-itd
http://blogs.cisco.com/datacenter/itd-load-balancing-traffic-steering-clustering-using-nexus-5k6k7k
