Asr 5500 System Administration Guide, Staros Release 21.4 - Cisco ASR 5000 Series Administration Manual

Requirements
• Two chassis configured for the same service types. The services must be bound on an SRP-activated
loopback interface.
• Both chassis must have identical hardware.
• Three contexts:
• Border Gateway Protocol (BGP) – ICSR uses the route modifier to determine the chassis priority.
ICSR is a licensed Cisco feature. Verify that each chassis has the appropriate license before using these
Important
procedures. To do this, log in to both chassis and execute a show license information command. Look
for "Inter-Chassis Session Recovery". If the chassis is not licensed, please contact your Cisco account
representative.
RADIUS and Diameter protocols can be monitored to trigger a switchover.

ASR 5500 System Administration Guide, StarOS Release 21.4

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◦Redundancy – to configure the primary and backup chassis redundancy.
◦Source – AAA configuration of the specified nas-ip-address must be the IP address of an interface
bound to an HA, or any core network service configured within the same context.
◦Destination – to configure monitoring and routing to the PDN.
Interchassis Session Recovery