Cisco ASR 900 Series Configuration Manual page 76
Time division multiplexing configuration; cisco ios xe fuji 16.7.x
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Also See for ASR 900 Series:
- Release notes (310 pages) ,
- Manual (174 pages) ,
- Configuration manual (172 pages)
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Configuring Multi Router Automatic Protection Switching
Information About MR-APS
• Failure 3, where the router P1 is isolated from the core.
Figure 7: Failure Points in the Network
In case of failure 1, where either port at the ADM goes down, or the port at the router goes down, or the link
between ADM and router fails, the APS switchover triggers the pseudowires at the protect interface to become
active. The same applies to failure 2 as well where the complete router fails over.
In case of failure 3, where all the links carrying primary and backup traffic lose the connection, a new client
is added to the inter chassis redundancy manager (ICRM) infrastructure to handle the core isolation. The client
listens to the events from the ICRM. Upon receiving the core isolation event from the ICRM, the client either
initiates the APS switchover, or initiates the alarm based on the peer core isolation state. If APS switchover
occurs, it changes the APS inactive interface to active and hence activates the PWs at the interface. Similarly,
when core connectivity goes up based upon the peer core isolation state, it clears the alarms or triggers the
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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