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Ingress packets are punted to the “Input ACL node” where traffic is classified based on n-tuple keys. If no matched session is found from the classify tables, then it will be passed to “the lookup node” for normal packet forwarding. If a classify session is hit from one of classify tables, then packet vnet buffer field sw_if_index[VLIB_TX] will be updated to the new FIB index used for subsequent IP lookup for this packet. Change-Id: Ifdea63196ddb81c2d5c43b8c98e11ddbf5b11858 Signed-off-by: Steve Shin <jonshin@cisco.com>