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Default Behavior Aggregate Classifiers

Table 180 shows the forwarding class and packet loss priority (PLP) that are assigned by default to each well-known 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 best-effort implies that the node does not support that class.

You can modify the default settings through configuration. For instructions, see Configuring Class of Service.

Table 180: Default Behavior Aggregate Classification

DSCP and DSCP IPv6 Alias	Forwarding Class	Packet Loss Priority (PLP)
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

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