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https://docs.sophos.com/nsg/sophos-firewall/21.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=rules-policies-firewall-DSCP

DSCP value

Describes the standard Differentiated Services Field Codepoints (DSCP) values of IPv4 and IPv6 headers to classify data packets and manage network traffic.

DiffServ Code Point (DSCP) uses 6 bits of the 8-bit differentiated services field in the IP header to classify data packets, allowing 64 different values (0 to 63). You can use the remaining DSCP values according to the quality of service (QoS) requirements.

Decimal DSCP Description
0 Default Best Effort
8 CS1 Class 1 (CS1)
10 AF11 Class 1, Gold (AF11)
12 AF12 Class 1, Silver (AF12)
14 AF13 Class 1, Bronze (AF13)
16 CS2 Class 2 (CS2)
18 AF21 Class 2, Gold (AF21)
20 AF22 Class 2, Silver (AF22)
22 AF23 Class 2, Bronze (AF23)
24 CS3 Class 3 (CS3)
26 AF31 Class 3, Gold (AF31)
28 AF32 Class 3, Silver (AF32)
30 AF33 Class 3, Bronze (AF33)
32 CS4 Class 4 (CS4)
34 AF41 Class 4, Gold (AF41)
36 AF42 Class 4, Silver (AF42)
38 AF43 Class 4, Bronze (AF43)
40 CS5 Class 5 (CS5)
46 EF Expedited Forwarding (EF)
48 CS6 Control (CS6)
56 CS7 Control (CS7)