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Default Behavior Aggregate Classification

Table 1 shows the forwarding class (FC) and packet loss priority (PLP) that are assigned by default to each well-known Differentiated Services (DiffServ) code point (DSCP). Although several DSCPs map to the expedited-forwarding (ef) and assured-forwarding (af) classes, by default no resources are assigned to these forwarding classes. All af classes other than af1x are mapped to best-effort, because RFC 2597, Assured Forwarding PHB Group, prohibits a node from aggregating classes. Assignment to the best-effort FC implies that the node does not support that class. You can modify the default settings through configuration.

Table 1: Default Behavior Aggregate Classification

DSCP and DSCP IPv6 Alias

Forwarding Class

Packet Loss Priority

ef

expedited-forwarding

low

af11

assured-forwarding

low

af12

assured-forwarding

high

af13

assured-forwarding

high

af21

best-effort

low

af22

best-effort

low

af23

best-effort

low

af31

best-effort

low

af32

best-effort

low

af33

best-effort

low

af41

best-effort

low

af42

best-effort

low

af43

best-effort

low

be

best-effort

low

cs1

best-effort

low

cs2

best-effort

low

cs3

best-effort

low

cs4

best-effort

low

cs5

best-effort

low

nc1/cs6

network-control

low

nc2/cs7

network-control

low

other

best-effort

low