Single Chassis and Multi-Chassis APS

APS can operate in a single chassis configuration (SC-APS) or in a multi-chassis configuration (MC-APS).

An SC-APS group can span multiple ports, MDAs or IOMs within a single node whereas as MC-APS can span two separate nodes as shown in Table 1.

Table 1. SC-APS versus MC-APS Protection
 

Single Chassis APS

Multi-Chassis APS

Short form name

SC-APS

MC-APS

Link failure protection (including intermediate transmission equipment failure)

Yes

Yes

Optical/electrical module (SPF, XFP) failure protection

Yes

Yes

MDA failure protection

Yes

Yes

IOM failure protection

Yes

Yes

Node failure protection

No

Yes

The support of SC-APS and MC-APS depends on switching modes, MDAs, port types and encaps. For a definitive description of the MDAs, port types, switching modes, bundles and encapsulations supported with APS, see APS Applicability, Restrictions and Interactions.