Specifications

38
OL-4923-01 B0
Monitoring and Maintaining HSA Operation
To monitor and maintain HSA operation, you can override the standby image that is bundled with the
active image. To do so, perform the following task in global configuration mode:
Note The slave image system command, previously used to determine which image the standby runs, is not
valid with newer HA images.
You can manually synchronize configuration files and ROM monitor environment variables on the active
and the standby RSPs. To do so, perform the following task in privileged EXEC mode:
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 is configured consistently with the active.
Failure to do so might result in an unconfigured standby RSP taking control of the router when the
active fails, rendering the network inoperable.
The slave sync config command is also a useful tool for more advanced implementation methods not
discussed in this document. Refer to the Configuration Fundamentals Configuration Guide and the
Configuration Fundamentals Command Reference publications, which are available on the
Documentation CD-ROM, online, or as printed documents.
Enabling High Availability Features
This section discusses the following topics:
• High Availability Features, page 39
• Hardware and Software Prerequisites, page 40
• Installation Procedures, page 41
– Configuring RPR and RPR+, page 43
– Configuring SLCR, page 59
– Configuring NonStop Forwarding (NSF), page 49
– Performing a Fast Software Upgrade, page 56
– Configuring SLCR, page 59
• RPR, RPR+, SSO, and FSU Troubleshooting Tips, page 58
Command Task
hw-module slot image Specifies which image the standby runs.
Command Task
slave sync config Manually synchronizes active and standby configuration
files.