Figure 9: Sc-Aps Group With Mda And Iom Protection - Alcatel-Lucent 7750 SR OS Interface Configuration Manual

APS on a Single Node (SC-APS)
In Single Chassis APS both circuits of an aps group are terminated on the same node.
The working and protect lines of a single chassis APS group can be:
•
•
•
If the working and protection circuits are on the same MDA, protection is limited to the physical
port and the media connecting the two devices. If the working and protection circuits are on
different IOMs then protection extends to MDA or IOM failure. The following figure shows a
configuration that provides protection against circuit, port, MDA or IOM failure on the 7750 SR
connected to an Add-Drop-Multiplexer (ADM).
APS Across Two Nodes (MC-APS)
Multi-Chassis APS functionality extends the protection offered by SC-APS to include protection
against nodal (7750 SR) failure by configuring the working circuit of an APS group on one 7750
SR node while configuring the protect circuit of the same APS group on a different 7750 SR node.
These two nodes connect to each other with an IP link that is used to establish an MC-APS
signalling path between the two 7750 SRs. Note that the working circuit and the protect circuit
must have compatible configurations (such as the same speed, framing, and port-type). The
relevant APS groups in both the working and protection routers must have same group ID, but
they can have different names (for example, group port descriptions). The configuration
consistency between the working circuit/router and the protection circuit/router is not enforced by
the 7750 SR. Service or network-specific configuration data is not signalled nor synchronized
between the two service routers.
7750 SR OS Interface Configuration Guide
Two ports on the same MDA.
Two ports on different MDAs but on the same IOM.
Two ports on different MDAs on two different IOMs (installed in different slots).
ADM ADM

Figure 9: SC-APS Group with MDA and IOM Protection

link 1 link 1
sc-aps sc-aps
group group
link 2 link 2
Interface Configuration
7750 SR 7750 SR
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