Cisco Cisco Tunnel Terminating Gateway (TTG)

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Usage Guidelines
Use this command to check if the DSCP value in the IPv4 ToS or IPv6 TC field of incoming IP packet matches
with configured ToS/TC value.
Examples
The following command will match all incoming packets which has DSCP value 20:
ip dscp = 20 mask 31
Command Line Interface Reference, Modes A - B, StarOS Release 19    
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ACS Ruledef Configuration Mode Commands
ip dscp