# atm oam

#### Syntax

atm oam [ vpi ] [ [ seg-loopback | end-loopback [ loopback-timer time ] ]
[ cc { source | sink | both } ] ]

no atm oam [ vpi ] [ [ seg-loopback | end-loopback [ loopback-timer time ] ] ]

#### Release Information

Command introduced before JunosE Release 7.1.0.

#### Description

Configures F4 OAM on an interface or circuit. The no version deletes F4 OAM circuits.

| Note: If you do not specify any options, both F4 end-to-end OAM and F4 segment OAM are enabled on all VPIs on the interface.

#### Options

- vpi—VPI on which you want to enable F4 OAM. If you do not specify a VPI, F4 OAM flow is enabled on all VPIs on the interface.
- seg-loopback—Enables F4 segment OAM
- end-loopback—Enables F4 end-to-end OAM
- loopback-timer—To generate F4 loopback cells on the VPI, you must configure the loopback timer; you can set the loopback timer only for end-to-end loopback
- time—Time interval in the range 1–600 seconds between transmissions of F4 loopback cells.
- cc—Enables CC cells on the PVC; you can enable CC cells only on data circuits, not on control circuits, such as ILMI or signaling circuits
- sink—Enables this VC as a sink point (cell receiver)
- source—Enables this VC as the source point (cell generator)
- both—Enables this VC as both a sink point and a source point

#### Mode

Interface Configuration, Subinterface Configuration