Allied Telesis AT-DC2552XS - Manual (Page 500)

Chapter 21: Quality of Service (QoS) Commands
500 Section V: Security and Traffic Control
Examples
This example adds the SYN and ACK flags as matching criteria to the
class map called “tcpstart”:
awplus> enable
awplus# configure terminal
awplus(config)# class-map tcpstart
awplus(config-cmap)# match tcp-flags syn ack
This example removes the ACK flag as a matching criterion from the class
map “tcpstart”:
awplus> enable
awplus# configure terminal
awplus(config)# class-map tcpstart
awplus(config-cmap)# no match tcp-flags ack