Understanding Basic Hardware Architecture and Cisco IOS Software
Upgrade the ROM Monitor Image
12
Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide
Changing Console Line Speed
Caution
Changing your console line speed on an active Cisco AS5350XM or Cisco AS5400XM universal
gateway results in a temporary loss of synchronization between the console line and terminal port
speeds. At this point, the gateway may recognize a false
send break
command that may result in your
system crashing.
To avoid this problem, you can do one of the following:
•
If the configuration register on your Cisco AS5350XM or Cisco AS5400XM already has the Break
Abort Effect bit set (mask is 0x0100), then you are protected and the false send break event does not
occur. (You can change the configuration register to have this bit set, but the change does not take
effect until your gateway is rebooted.)
•
If the configuration register does not have the Break Abort Effect bit set (mask 0x0100), then
disconnect the cable on the console port and either log in to the Cisco AS5350XM or
Cisco AS5400XM universal gateway through the AUX port or telnet in through a VTY session.
Change the console line speed and the related terminal server speed, and then reconnect the console
cable.
Log in to your Cisco AS5350XM or Cisco AS5400XM universal gateway through the AUX port or
Telnet VTY session. Enter the
show running-config
command and determine the speed your line
console is set for. Possible console speeds are 1200, 2400, 4800, 9600, 19200, 38400, 57600, and
115200. The default setting is 9600.
If your gateway is in ROM monitor mode, then the AUX port is not functioning. You must then change
the terminal server port speed through your console port connection until the
rommon>
prompt is
displayed. See
Appendix B, “ROM Monitor.”
Changing Gateway Line Speed
The following example shows how to configure line speed on a Cisco AS5350XM or Cisco AS5400XM
universal gateway, beginning in global configuration mode:
Router(config)#
line 3
Router(config-line)#
speed
speed_value
Upgrade the ROM Monitor Image
Use the
upgrade rom-monitor
command to upgrade the ROM monitor to a new version. The Cisco
AS5350XM and Cisco AS5400XM universal gateways have two ROM monitor images. The original
image shipped with your system is a read-only image that cannot be erased or altered in the field; the
second image is read-and-write upgradable by the field. This eliminates or reduces the need to physically
replace the hardware in order to get a new image.
The
upgrade rom-monitor
commands allow you to:
•
Load the upgrade ROM monitor image.
•
Configure your system to point to the upgrade ROM monitor image at the next reboot of your router.
•
Select the read-only ROM monitor image for execution on the next reboot.
•
Display both ROM monitor image versions and which ROM monitor image is currently selected.
