For multiple WAAS instances WCCP for 2900/3900 series is needed to manage multiple node groups using UCS-E or SRE. It is recommended that all WAAS nodes in a WCCP node group have similar capacity/connection limits. So for example with 3900 series which includes 2500 TCP Connections, add one or two UCS-E modules each with vWAAS 2500 for up to 7500 total TCP connections on the router or a single 6k vWAAS instance per UCS-E module up to 8500 total TCP connections. Additional WAAS RTU license is required Multiple vWAAS instances on UCS-E modules is supported up to the max throughput of the router with services enabled