Table 17: Aps Switching Modes - Alcatel-Lucent 7750 Configuration Manual

Port Features
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 17: 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 encaps.
For a definitive description of the MDAs, port types, switching modes, bundles and encapsulations
supported with APS, see
Page 76
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
bi-directional
Yes
Yes
No
APS Applicability, Restrictions and Interactions on page
Unidirectional 1+1
Signalling APS
Uni 1+1 Sig APS
uni-directional
Yes
Yes
No
7750 SR Interface Configuration Guide
Unidirectional 1+1
Signalling and
Datapath APS
Uni 1+1 Sig+Data APS
uni-1plus1
Yes
Yes
Yes
90.