Configuring High System Availability
However, automatic synchronization is enabled by default on the RSP. Therefore, unless you have disabled automatic synchronization, or this is the first time you are installing a second RSP, a manual update is not required. For more information about automatic synchronization, see the “Ensuring that Both RSPs Contain the Same Configuration Files” section on page 28 .
Caution When you install a second RSP for the first time, you must immediately configure it using the slave sync config command. This ensures that the new standby RSP is configured consistently with the active RSP. Failure to do so might result in an unconfigured standby RSP taking control of the router when the active RSP fails, rendering the network inoperable.
For additional information about using the slave sync config command, see the “Monitoring and Maintaining HSA Operation” section on page 40 . For more complete HSA configuration information, refer to the Cisco IOS Configuration Fundamentals Configuration Guide and the Cisco IOS Configuration Fundamentals Command Reference publications.
To manually set environment variables on the standby RSP, use the following commands beginning in global configuration mode:
| Command | Purpose |
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Step 1 | Router(config)# boot system | (Optional) Specifies the system image that the router loads at |
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| startup and stores it in the BOOT variable in the current running |
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| configuration. |
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| Note For a complete syntax description and usage guidelines, |
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| refer to the Cisco IOS Configuration Fundamentals |
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| Command Reference publication. |
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Step 2 | Router(config)# boot bootldr | (Optional) Specifies the Flash file system and file name that ROM |
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| uses at startup and stores it in the BOOTLDR variable in the |
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| current running configuration |
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Step 3 | Router(config)# boot config | (Optional) Specifies the location of the configuration file that the |
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| router uses at startup and stores it in the CONFIG_FILE |
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| environment variable in the current running configuration. |
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Step 4 | Router(config)# end | Exits global configuration mode and returns you to privileged |
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| EXEC configuration mode. |
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Step 5 | Router# copy | Saves the current running configuration settings to the startup |
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| configuration. This also puts the information under the RSP’s |
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| ROM monitor control. |
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Step 6 | Router# show bootvar | Verifies the environment variable settings. |
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Step 7 | Router# configure terminal | Enters global configuration mode. |
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Step 8 | Router(config)# slave sync config | Saves the same environment variables to the standby RSP by |
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| manually synchronizing their configuration files. |
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Automatically Setting Environment Variables on the Standby RSP
With automatic synchronization turned on, when you set the active RSP environment variables and save them, the system automatically saves the same environment variables to the standby’s startup configuration.
Route Switch Processor (RSP8) Installation and Configuration Guide
| 39 |
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