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Due to the fact that the rule table is processed entirely in switch chips hardware, there is a limitation to how many rules you may have. Depending on the number of conditions (MAC layer, IP layer, IPv6, L4 layer) you use in your rules, the number of active rules may vary from 8 to 32 for Atheros8316 switch chip and , from 24 to 96 for Atheros8327/QCA8337 switch chip and from 42 to 256 for 88E6393X switch chip. You can always do/interface ethernet switch rule print after modifying your rule set to see that no rules at the end of the list are 'invalid' which means those rules did not fit into the switch chip.