•Important: A switchover event caused by a AAA monitoring failure is non-revertible. If the newly active chassis fails to monitor the configured AAA servers it remains as the active chassis until either a manual switchover, or another non-AAA failure event causes the system to switchover.
Important: ICSR is a licensed feature. Be sure that each chassis has the appropriate license before using the procedures in this chapter. To do this, log in to both chassis and execute a show license information command. Interchassis Session Recovery feature is listed as Inter-Chassis Session Recovery. If the chassis is not licensed, please contact your local sales representative.
This section provides an operational flow for ICSR. The following figure shows an ICSR process flow.During initialization, if both chassis are misconfigured in the same mode - both active (primary) or both standby (backup), then the chassis with the highest priority (highest number set with SRP priority) becomes active and the other chassis becomes the standby.If the chassis priorities are the same, the system compares the two MAC addresses and the chassis with the higher SPIO MAC address becomes active. For example, if the chassis have MAC addresses of 00-02-43-03-1C-2B and 00-02-43-03-01-3B, the last 3 sets of octets (the first 3 sets are the vendor code) are compared. In this example, the 03-1C-2B and 03-01-3B are compared from left to right. The first pair of octets in both MAC addresses are the same, so the next pairs are compared. Since the 01 is lower than the 1C, the chassis with the SPIO MAC address of 00-02-43-03-1C-2B becomes active and the other chassis the standby.Important: The ICSR configuration must be the same on the primary and backup chassis. If each chassis has a different srp configuration, the session recovery feature does not function and sessions cannot be recovered when the active chassis goes out of service.
Important: This section provides the minimum instruction set for configuring ICSR on the system. For more information on commands that configure additional parameters and options, refer to the Command Line Interface Reference.
• In addition, the IP address pools must be srp activated.For more configuration information and instructions on configuring the AAA server, refer to the AAA Interface Administration and Reference.
• BGP router installed and configured. See Routing for more information on configuring BGP services.
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Step 6 Save your configuration as described in the Verifying and Saving Your Configuration chapter.
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Step 5 Save your configuration as described in the Verifying and Saving Your Configuration chapter.Important: ICSR is configured using two systems. Be sure to create the redundancy context on both systems. CLI commands must be executed on both systems. Always make configuration changes on the primary system first. It would be a good idea to log on both chassis before continuing. Before starting this configuration, determine which system to configure as the primary and use that login session.
Important: CLI commands must be executed on both systems. Always make configuration changes on the primary system first. It would be a good idea to log on both chassis before continuing.
Important: CLI commands must be executed on both systems. Always make configuration changes on the primary system first. It would be a good idea to log on both chassis before continuing.
The output of this command given below is the sample output. In this example, a SRP context called srp1 was configured and you can observe some parameters configured as default.
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Step 4 Save your configuration as described in the Verifying and Saving Your Configuration chapter.
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Step 5 Save your configuration as described in the Verifying and Saving Your Configuration chapter.
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