Preparing For A Hot Swap - Bay Networks 5393 Hardware Installation Manual

Preparing for a Hot Swap

The Remote Annex can be inserted into or removed from a chassis
without interrupting service to other modules within the 5000 hub.
This ability is referred to as "hot swapping."
The Remote Annex holds 64KB of configuration information in
EEPROM. This information is periodically sent to the host server to
be saved in a file. During a hot swap, the new Remote Annex reads
in this file at boot time and overwrites its EEPROM with the
configuration information from the Remote Annex it is replacing. The
new Remote Annex then functions as the previous Remote Annex,
except for the option keys, which need to be reprogrammed.
If no EEPROM overwrite is desired when hot swapping,
select default values for that slot from the supervisory
module on the service port terminal.
There are two methods of writing the EEPROM information to the
host file:
Whenever a change is made to EEPROM, a 5 minute timer
is started. When the timer expires, the contents of the
EEPROM memory are copied to an internal buffer in the
Remote Annex RAM and encrypted. The file is then
transferred to the host specified in the configuration
parameter pref_dump_addr. The filename used to store the
EEPROM information on the host is params.n.n.n.n (where
n.n.n.n is the IP address of the Remote Annex).
In addition, writing the EEPROM information to the host can
be forced by using the Remote Annex's superuser cp -e
command. This can be done at any time and typically is done
if you have just completed making changes to one of the
configuration files or some of the configuration parameters.
Remote Annex 5393/PRI Hardware Installation Guide
Chapter 4 Troubleshooting Procedures
4-19