Table 15: Aps Switching Modes - Alcatel-Lucent 7750 SR OS Interface Configuration Manual

APS Switching Modes
APS behavior and operation differs based on the switching mode configured for the APS group.
Several switching modes are supported in SR-OS.
The switching mode affects how the two directions of a link behave during failure scenarios and
how APS tx operates.
Unidirectional / Bidirectional configuration must be the same at both sides of the APS group. The
APS protocol (K byte messages) exchange switching mode information to ensure that both nodes
can detect a configuration mismatch.
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Table 15: APS Switching Modes

Short form name
CLI keyword
Interworks with a
standards compliant APS
implementation
Full 1+1 APS standards-
based signalling
Data is transmitted
simultaneously on both
links/circuits (1+1 Data)
The support of switching modes depends on SC-APS / MC-APS, MDAs, port types and ecaps.
For a definitive description of the MDAs, port types, switching modes, bundles and
encapsulations supported with APS please see
page 80.
7750 SR OS Interface Configuration Guide
If one end of an APS group is configured in a Unidirectional mode (Uni 1+1 Sig APS or
Uni 1+1 Sig+Data APS) then the other end must also be configured in a Unidirectional
mode (Uni 1+1 Sig+Data APS).
If one end of an APS group is configured in a Bidirectional mode then the other end must
also be configured in Bidirectional mode.
Bidirectional 1+1
Signalling APS
Bidir 1+1 Sig APS Uni 1+1 Sig APS
bi-directional
Yes
Yes
No
APS Applicability, Restrictions and Interactions on
Interface Configuration
Unidirectional Unidirectional 1+1
1+1 Signalling Signalling and
APS Datapath APS
Uni 1+1 Sig+Data
uni-directional
Yes
Yes
No
APS
uni-1plus1
Yes
Yes
Yes
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