Inter Chassis Redundancy Manager; Limitations - Cisco ASR 900 Series Configuration Manual
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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Inter Chassis Redundancy Manager
switched because of a router failure, degradation or loss of channel signal, or manual intervention. In
bidirectional mode, the receive and transmit channels are switched as a pair.
Two SONET/SDH connections are required to support APS. In a telco environment, the SONET/SDH circuits
must be provisioned as APS. You must also provision the operation (for example, 1+1), mode (for example,
bidirectional), and revert options (for example, no revert). If the SONET/SDH connections are homed on two
separate routers (the normal configuration), an out of band (OOB) communications channel between the two
routers needs to be set up for APS communication.
When configuring APS, we recommend that you configure the working interface first. Normal operation with
1+1 operation is to configure it as a working interface. Also configure the IP address of the interface being
used as the APS OOB communications path.
APS uses Protect Group Protocol (PGP) between working and protect interfaces. The protect interface APS
configuration should include an IP address of a loopback interface on the same router to communicate with
the working interface using PGP. Using the PGP, POS interfaces can be switched in case of a degradation or
loss of channel signal, or manual intervention. In bidirectional mode, the receive and transmit channels are
switched as a pair.
In bidirectional APS the local and the remote connections negotiate the ingress interface to be selected for
the data path. The egress interface traffic is not transmitted to both working and protect interfaces.
Inter Chassis Redundancy Manager
ICRM provides these capabilities for stateful MLPPP with MR-APS Inter-Chassis Redundancy implementation:
• Node health monitoring for complete node, PE, or box failure detection. ICRM also communicates
• Reliable data channels to transfer the state information.
• Detects active RP failure as node failure and notifies the controllers.
ICRM on the standby RP re-establishes the communication channel with peer node if the active RP fails.
For instructions on how to configure ICRM, see
Redundancy.
Limitations
The following limitations apply when using APS on the Cisco ASR 903 Router
• Starting Cisco IOS XE Release 3.11, APS is supported with CES.
• APS is not supported with ATM.
• APS is not supported with IMA.
• APS is not supported with POS.
• APS supports HDLC, PPP, and MLPPP encapsulation.
• ATM Layer 2 AAL0 and AAL5 encapsulation types are supported
• APS is only supported on MLP and serial interfaces on the OC-3 interface module.
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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failures to the applications registered with an ICRM group.
Automatic Protection Switching Configuration
Stateful MLPPP Configuration with MR-APS Inter-Chassis
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