Specifications

OL-4923-01 B0

Router> enable

Password:

Step 2 Enter the password (the password is case sensitive). For security purposes, the password is not displayed.

Step 3 When you enter the correct password, the system displays the privileged-level system prompt (#) as

follows:

Router#

The pound sign (#) at the system prompt indicates the privileged level of the EXEC command interpreter,

from which you can execute EXEC-level commands.

This completes the procedure for using the EXEC command interpreter.

For configuration information and support, refer to the Cisco IOS software configuration documentation

set that corresponds to the software release installed on your Cisco hardware.

Note You can access Cisco IOS software configuration at http://www.cisco.com. Refer to the Software

Advisor at http://www.cisco.com/cgi-bin/Support/CompNav/Index.pl for additional information.

For troubleshooting information, refer to the “Troubleshooting the Installation” section on page 60.

Configuring High System Availability

This section describes high system availability (HSA), a feature that enables a router to continue

processing and forwarding packets after a planned or unplanned outage.

It includes the following topics:

• HSA Active and Standby Operation, page 24

• HSA Implementation Methods, page 25

• HSA System Requirements, page 25

• Configuring HSA Operation Task List, page 25

• Setting Environment Variables on the Active and the Standby RSPs, page 36

HSA is the system default when two RSP2s, or an RSP2 and an RSP4/4+ (one designated as the “active”

or “master” and the other as the “standby” or “slave”) are installed in a router and the active RSP2 fails.

The standby RSP2 takes over in this situation, known as a “cold standby.” The router restarts without

manual intervention (for example, without inserting a new RSP) by rebooting with the standby RSP. The

standby has its own image and configuration file and acts as a single processor.

Caution To ensure proper functioning of the standby RSP2 in the event of an active RSP2 failure, the standby

RSP2 should have the same boot image, the same ROM monitor, and the same DRAM configuration

as the active RSP2.