User guide

fast-aps-switch

Syntax fast-aps-switch;

Hierarchy Level [edit interfaces interface-name sonet-options aps]

Release Information Statement introduced in Junos OS Release 12.1.

Description (M320 routers with Channelized OC3/STM1 Circuit Emulation PIC with SFP only and EX

Series switches) Reduce the Automatic Protection Switching (APS) switchover time in

Layer 2 circuits.

NOTE:

• Configuring this statement reduces the APS switchover time only when

the Layer 2 circuit encapsulation type for the interface receiving traffic from

a Layer 2 circuit neighbor is SAToP.

• When the fast-aps-switch statement is configured in revertive APS mode,

you must configure an appropriate value for revert time to achieve reduction

in APS switchover time.

• To prevent the logical interfaces in the data path from being shut down,

configure appropriate hold-time values on all the interfaces in the data

path that support TDM.

• The fast-aps-switch statement cannot be configured when the APS annex-b

option is configured.

• The interfaces that have the fast-aps-switch statement configured cannot

be used in virtual private LAN service (VPLS) environments.

Required Privilege

Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Documentation

• Reducing APS Switchover Time in Layer 2 Circuits

E1 Interfaces Feature Guide for Routing Devices