Cisco ASR 900 Series Configuration Manual page 127

Configuring MSP on 1-Port OC192/STM-64 or
8-Port OC3/12/48/STM-1/-4/-16 Module
Multiplex Section Protection (MSP) is a protection mechanism for SDH networks that enables SDH
connections to switch to another SDH circuit when a port failure occurs. A protection interface serves as the
backup interface for the working interface. When the working interface fails, the protection interface quickly
assumes its traffic load.
The SDH protection schemes comply with GR-253 and ITU-T G.783. It allows Optical Interface Module
to work seamlessly as SDH Add or Drop Multiplexers (ADMs). The implementation of the above protection
schemes allows a pair of SDH lines or paths to be configured for line or path redundancy. In the event of a
fiber cut, the active line or path switches automatically to the standby line or path up to 60 milliseconds
(2/5/10 millisecond for holdover and 50 millisecond switchovers).
Optical Interface Module supports the following SDH protection switching schemes:
• Linear Bidirectional 1+1 MSP
• Linear Unidirectional 1+1 MSP
• 1+1 MSP, page 114
• Benefits of MSP, page 114
• Restrictions for MSP, page 114
• MSP 1+1 for SDH Layer 1 traffic , page 115
• Scenario for Bidirectional MSP 1+1, page 115
• Scenario for Unidirectional MSP 1+1, page 116
• Configuring MSP for SAToP, page 116
• Configuring MSP for CESoPSN, page 119
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x (Cisco
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ASR 900 Series)
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