DS Codepoint (DSCP)

The DS codepoint defines in the packet header the action that any diffserv-aware system should take on a marked packet. The diffserv architecture defines a set of DS codepoints and corresponding actions, or forwarding behaviors, for the IPQoS-enabled system and router to use. The IPQoS-enabled system marks the precedence bits of the DS field in the packet header with the DSCP. When a router receives a packet with a DSCP value, the router applies the forwarding behavior associated with that DSCP as the packet is released onto the network.

The dlcosmk meter does not use the DSCP. Rather, dclosmk marks Ethernet frame headers with a CoS value. If you plan to configure IPQoS on a network that uses VLAN devices, refer to Marker Module.