Figure 10: Mc-Aps Group Protects Against Node Failure - Alcatel-Lucent 7750 SR OS Interface Configuration Manual

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Signalling is provided using the direct connection between the two service routers. A heartbeat

protocol can be used to add robustness to the interaction between the two routers. Signalling

functionality includes support for:

Note that external requests like lockout, force, and manual switches are allowed only on the APS

group having the protection circuit.

The following figure illustrates a Multi-Chassis APS group being used to protect against link, port,

MDA, IOM or node failure.

APS group matches between service routers.

Verification that one side is configured as a working circuit and the other side is

configured as the protect circuit. In case of a mismatch, a trap (incompatible neighbor) is

Change in working circuit status is sent from the working router to keep the protect router

Protect router, based on K1/K2 byte data, member circuit status, and external request,

selects the active circuit, and informs the working router to activate or de-activate the

working circuit.

Figure 10: MC-APS Group Protects Against Node Failure

7750 SR OS Interface Configuration Guide

mc-aps signalling link