About using CARP

When there are multiple Microsoft Forefront Threat Management Gateway servers, Forefront TMG uses Cache Array Routing Protocol (CARP) to provide an array of Forefront TMG computers as a single, logical cache. CARP allows Forefront TMG array members to efficiently balance Web-based client load and split cached content between them. On the client side, CARP provides client computers with the information and algorithms required to identify the best server in the array to serve their request, thus eliminating the need for array members to forward requests between the array members. CARP also supports array server selection by the servers themselves and chained proxies.