Installation guide

Configure A Preferred Primary
GRP Redundant Processor Support 15
Configure A Preferred Primary
The arbitration process determines which GRP will become the primary and which will serve as the
secondary. When the primary GRP and the secondary GRP are configured to boot different system
images, the GRP that boots the most recent version is chosen, by default, as the primary GRP.
However, you can override the arbitration process and specify which GRP will be the primary. To
configure a preferred primary GRP, perform the following task, beginning in privileged EXEC
mode:
Remove a Preferred Primary Configuration
To remove a preferred primary GRP configuration, perform the following task, beginning in
privileged EXEC mode:
Revert to Single GRP Operation
You can revert to single GRP operation in the router and disable the redundant GRP feature.
Determine which GRP to remove from redundant operation. Note the slot number of that GRP,
which you will use when you reconfigure the router for single-GRP operation.
To revert to single-GRP operation, perform the following task, beginning in privileged EXEC mode:
The unused GRP reloads and remains at the ROM monitor prompt until you remove it from the
router chassis or you reload it by using the ROM monitor boot command. You need not disable a
GRP via the command line interface. Simply removing one of the GRPs will cause the router to
revert to redundant operation. Reverting to single-GRP operation by using the command line
interface is useful when you suspect problems with a GRP but cannot get to the router to pull out the
GRP card.
Task Command
Step 1 Specify a preferred primary GRP. redundancy prefer slot number
Task Command
Step 1 Remove the primary GRP selection and restore the
default arbitration choice.
redundancy prefer none
Task Command
Step 1 Enter configuration mode, selecting the terminal
option.
configure terminal
Step 2 Modify the existing configuration register setting
and specify that the router will boot to ROM
monitor mode.
hw-module slot number config-register 0x0
Step 3 Exit configuration mode. end
Step 4 Copy the configuration changes to the startup
configuration.
copy running-config startup-config
Step 5 If it is the primary GRP you are removing from
redundant operation, force it to become the
secondary.
redundancy force-failover
Step 6 If it is the secondary GRP you are removing from
redundant operation, force it to reload.
hw-module secondary reload