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Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Configuring High System Availability
HSA System Requirements
To configure HSA operation with the RSP8, you must have:
• A Cisco 7507, Cisco 7507-MX, Cisco 7513, or Cisco 7513-MX containing one RSP active
processor card, one RSP standby processor card, and the proper Cisco IOS release (refer to the
Software Advisor at http://www.cisco.com/cgi-bin/Support/CompNav/Index.pl for additional
information).
• A standby RSP with the same (or higher) DRAM and Flash memory capacity as the active RSP. See
the “Memory Requirements” section on page 13 for RSP8 memory component requirements.
• A standby RSP with the same boot image, the same ROM monitor, and the same DRAM
configuration as the active RSP. (See the “Hardware Prerequisites” section on page 14.)
Caution The HSA feature works with two RSP8 cards, or with one RSP8 and one RSP16. The RSP8 cannot
be used in combination with the RSP1, RSP2 or RSP4/4+ when utilizing the HSA feature.
HSA Configuration Task List
Before you configure HSA, decide how you intend to use HSA, as described in the “HSA
Implementation Methods” section on page 26. Do you want it for simple hardware backup or for
software error protection? If you are using new or experimental Cisco IOS software, consider using the
software error protection method; otherwise, use the simple hardware backup method.
Once you have decided which method to use, complete the tasks in the following sections. The first two
and last two tasks are required for both implementations. The third and fourth tasks relate to simple
hardware backup. The fifth task relates to software error protection only.
• Specifying the Default Standby RSP, page 28 (both implementations)
• Ensuring that Both RSPs Contain the Same Configuration Files, page 28 (both implementations)
• Ensuring that Both RSPs Contain the Same System Image, page 29 (simple hardware backup only)
• Ensuring that Both RSPs Contain the Same Microcode Image, page 30 (simple hardware backup
only)
• Specifying Different Startup Images for the Active and the Standby RSPs, page 32 (software error
protection only)
• Setting Environment Variables on the Active and the Standby RSPs, page 38 (both implementations)
Note The following HSA configuration examples refer to a Cisco 7513. If you have a Cisco 7507, the primary
difference is that the active and the standby RSPs are located in slots 2 and 3, respectively.