Cisco 10008 - Manual (Page 16)

16
Cisco 10008 Router Performance Routing Engine 3 Installation
OL-8544-01
Forcing Failover in a Redundant Pair
If these troubleshooting procedures do not correct the problem, refer to the Cisco 10000 Series Router
Troubleshooting Guide for additional information.
Forcing Failover in a Redundant Pair
To manually force the active and standby devices in a redundant pair to failover, use the redundancy
force-failover command. Manually force the active and standby PRE3s to reverse roles if you need to
replace the active one. You can then replace the PRE3 while causing only minimal disruption of traffic.
The following example shows how to set the standby PRE3 to be active:
Router# redundancy force-failover main-cpu
This command does not generate an alarm.
Managing System Boot Parameters
During the boot process, the system reads a software configuration register that defines certain system
parameters. The software configuration register is a 16-bit register in NVRAM used to define such
characteristics as:
• The source of the Cisco IOS software image required to run the router
• Whether the system software should ignore the contents of NVRAM
• The behavior of the Break function
By modifying the boot parameters, you can customize your Cisco 10008 router. For example, a common
configuration register setting in some lab environments is 0x2100. Using this setting, the system boots
to the ROM monitor (ROMmon) prompt, where a technician can load a specific image by entering the
boot command at the ROMmon prompt.
The FAIL LED does not light
during the power-on self-test 1. The PRE3 is not properly
seated.
2. Bad PRE3 slot or backplane
connector.
1. Be sure the ejector levers
are fully closed and that
the captive screws have
been tightened.
2. Remove the PRE3 and
install it in another PRE3
slot.
PRE3 does not operate properly 1. Bad PRE3 slot or backplane
connector.
2. Bad PRE3.
1. Remove the PRE3 and
install it in another PRE3
slot.
2. Replace the PRE3.
Symptom Possible Cause Corrective Action