Supplying a DS Codepoint to the Marker

The DS codepoint is 6 bits in length. The DS field is 1 byte long. When you define a DS codepoint in the IPQoS configuration file, the marker marks the first 6 significant bits of the packet header with the DS codepoint. The remaining 2 least-significant bits are unused.

To define a DS codepoint, you use the following parameter within a marker action statement:

 dscp_map{0-63:DS_codepoint}

The dscp_map parameter is a 64-element array, which you populate with the DS codepoint (DSCP) value. dscp_map is used to map incoming DSCPs to outgoing DSCPs that are applied by the dscpmk marker.

You must specify the DSCP value to dscp_map in hexadecimal notation. For example, you must translate the EF codepoint of 101110 into the hexadecimal value 46, which results in dscp_map{0-63:46}. For AF codepoints, you must translate the various codepoints that are shown in Table 6–2 to hexadecimal for use with dscp_map.