Specifications

104 Implementing IBM System Networking 10Gb Ethernet Switches
򐂰 Class Selector (CS): This PHB has eight priority classes, with CS7 representing the
highest priority, and CS0 representing the lowest priority, as shown in Table 2-8. CS PHB
is described in RFC 2474, found at:
http://www.ietf.org/rfc/rfc2474.txt
Table 2-8 Class Selector PHB
QoS levels
Table 2-9 shows the default service levels provided by the VFSM, listed from highest to lowest
importance:
Table 2-9 Default QoS service levels
DSCP re-marking and mapping
The switch can use the DSCP value of ingress packets to re-mark the DSCP to a new value,
and to set an 802.1p priority value.
Priority Class selector DSCP
Highest CS7 56
CS6 48
CS5 40
CS4 32
CS3 24
CS2 16
CS1 8
Lowest CS0 0
Service level Default PHB 802.1p priority
Critical CS7 7
Network Control CS6 6
Premium EF, CS5 5
Platinium AF41, AF42, AF43,
and CS4
4
Gold AF31, AF32, AF33,
and CS3
3
Silver AF21, AF22, AF23,
and C22
2
Bronze AF11, AF12, AF13,
and CS1
1
Standard DF and CS0 0