Cisco 7500 SERIES ROUTE SWITCH PROCESSOR 16 Specification Guide

This completes the procedure for using the EXEC command interpeter.

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.

You can access Cisco IOS software configuration information 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

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 is the system default when two RSP16 cards (one designated as the “active” and the other as the
“standby”) are installed in a router and the active RSP16 card fails. The standby RSP16 card 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.

To ensure proper functioning of the standby RSP16 in the event of an active RSP16 failure, the standby
RSP16 should have the same boot image, the same ROM monitor, and the same DRAM configuration as
the active RSP16.

An RSP16 can interoperate with another RSP16 or with an RSP8. It cannot interoperate with an RSP1,
RSP2, RSP4, or an RSP4+. In the following text, you can substitute references to two RSP16s with an
RSP16 and an RSP8.

When two new RSP16s (or an RSP16 and an RSP8) are installed at the same time, the RSP that occupies
the first even RSP slot on the router is the active (normally the RSP16, if the RSP8 was used in
conjunction with the RSP16), and the RSP that occupies the odd RSP slot is the standby. If a crash has
occurred, the RSP in the odd slot becomes the active and the RSP in the even slot becomes the standby.

HSA is supported on the following routers: Cisco 7507, Cisco 7507-MX, Cisco 7513, and Cisco
7513-MX. HSA is not supported on the Cisco 7505 or the Cisco 7576 routers.

The cold standby procedure, from initial failure to first packet transmission, currently takes
approximately eight to ten minutes.