Default IP Precedence Classifier

By default, Junos automatically assigns an implicit IP precedence classifier called ipprec-compatibility to all logical interfaces. The ipprec-compatibility IP precedence classifier maps IP precedence bits to forwarding classes and packet loss priorities (PLPs), as shown in Table 1.

Table 1: Default IP Precedence (ipprec-compatibility) Classifier
IP Precedence Bits	Forwarding Class	Loss Priority
`000`	`best-effort`	`low`
`001`	`best-effort`	`high`
`010`	`best-effort`	`low`
`011`	`best-effort`	`high`
`100`	`best-effort`	`low`
`101`	`best-effort`	`high`
`110`	`network-control`	`low`
`111`	`network-control`	`high`

The other default IP precedence classifier (called ipprec-default) overrides the ipprec-compatibility classifier when you explicitly associate it with a logical interface. To associate ipprec-default with a logical interface, include the default statement at the [edit class-of-service interfaces interface-name unit logical-unit-number classifiers inet-precedence] hierarchy level:

Table 2 shows the forwarding class and PLP that Junos assigns to the IP precedence bits when you apply the default IP precedence classifier.

Table 2: Default IP Precedence (ipprec-default) Classifier
IP Precedence Bits	Forwarding Class	PLP
000	`best-effort`	`low`
001	`assured-forwarding`	`low`
010	`best-effort`	`low`
011	`best-effort`	`low`
100	`best-effort`	`low`
101	`expedited-forwarding`	`low`
110	`network-control`	`low`
111	`network-control`	`high`

Default IP Precedence Classifier

Related Documentation