Cisco 7500 SERIES ROUTE SWITCH PROCESSOR 16 Specification Guide

You can manually synchronize configuration files and ROM monitor environment variables on the active
and the standby RSPs using the following command in privileged EXEC configuration mode:

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 Cisco IOS Configuration Fundamentals Configuration Guide
and the Cisco IOS Configuration Fundamentals Command Reference publications, which are available
on the Documentation CD-ROM, online on Cisco.com, or as printed documents.

This section discusses the following topics:

High availability (HA), an alternative to the default high system availability (HSA) feature, is a series
of features that minimizes system downtime through a “warm standby.” Warm standby allows the system
to switch over to a standby RSP preloaded with a Cisco IOS image in 30 seconds to 5 minutes, depending
on the feature. For more information on high service availability (HSA), the system default program,
refer to the

. Like HSA, HA is supported on

the Cisco 7507, Cisco 7507-MX, Cisco 7513, and Cisco 7513-MX routers with two RSP16s, or with one
RSP16 and one RSP8.

A router configured for HA has two RSPs, an active RSP and a standby RSP. The active RSP controls
all functions of the router, and the standby RSP monitors the active for failure.

Router# slave sync config

Manually synchronizes active and standby configuration
files.