This directive allows you to set specific DSCP (differential services code point) values for outgoing TCP connections—those made to origin servers and neighbors. The differential services protocol is quite complex. Simply using the example in the following table will get you nowhere. Make sure that you understand what you are doing before using this directive. See RFCs 2474, 2475, and 3140 for additional information on differential services.
tcp_outgoing_tos byte-value [!]
acl NormalService src 10.0.0.0/255.255.255.0 acl BetterService src 10.0.1.0/255.255.255.0 tcp_outgoing_tos 0x00 NormalService tcp_outgoing_tos 0x20 BetterService