We have to redesign our WCCP setup at the branch office, because WAAS VB doesn't support standby. Our current design is having 2 WAN routers, one is for the primary WAN (MPLS) and the 2nd is for a GRE backup. Both WAEs GIG 1/0 interfaces are plugged directly into a 4ESW-HWIC module on an ISR router on the primary one, GIG 2/0 interfaces are plugged directly in another 4ESW-HIC module on the backup GRE router. The 4ESW-HWIC doesn't support port-channel so this is my reasoning for the redesign. See attached WAAS_Branch_Current_Design PIC.
The WCCP 61/62 options are currently configured on the LAN facing interface on the routers, 61 out and 62 redirect in for load balancing based on destination IP address. The new design is moving the WAE to the CORE layer and configuring port-channel since we’re going to be using VB at the branches. The WCCP will still be done at the WAN router edge. I was told it’s best to use the WCCP option inbound only, rather than an outbound redirection.
Based on the attached WAAS Branch Redesign PIC, would there be any WCCP routing loops with respect to where I have placed the 61 and 62 options? Some branches will have remote sale centers hanging off of either the WAN primary router or the GRE backup router, but not have WAAS. It’s most likely traffic could be seen twice on a 61 redirect in. One of the designs I’ve seen in a PDF doc from Networkers (BRKAPP-2021) showing the 61 and 62 are on the WAN facing interfaces to avoid WCCP routing loops with a dual router scenario at a branch site. The number of uses will vary from 50 to 400+. I want to keep the design the same for every branch.