Introduction
This document describes a rare problem and solution about Catalyst 9000 Series Switches that fail to boot normally and fall into the bootloader (switch:) prompt.
Problem
Chassis 2 reloading, reason - Active/Standby selection failed in 1+1 Mode.
switch: boot
attempting to boot from [flash:packages.conf]
Located file packages.conf
#
##########################################################################################################################
Validate packages: SHA-1 hash:
calculated 550C9730:667B2788:DD6F6B06:D0FFA819:01A315DA
expected 550C9730:667B2788:DD6F6B06:D0FFA819:01A315DA
Both links down, not waiting for other switches
Switch number is 2
Chassis 2 reloading, reason - Active/standby selection failed in 1+1 Mode <<<<<<
Feb 19 20:06:55.572 FP0/0: %PMAN-5-EXITACTION: Process manager is exiting: reload fp action requested
Feb 19 20:06:57
Initializing Hardware...
System Bootstrap, Version 16.6.1r [FC1], RELEASE SOFTWARE (P)
Compiled Sat 07/15/2017 8:31:57.39 by rel
Current image running:
Primary Rommon Image
Last reset cause: SoftwareReload
C9300-48U platform with 8388608 Kbytes of main memory
attempting to boot from [flash:packages.conf]
Located file packages.conf
#
##########################################################################################################################
Validate packages: SHA-1 hash:
calculated 550C9730:667B2788:DD6F6B06:D0FFA819:01A315DA
expected 550C9730:667B2788:DD6F6B06:D0FFA819:01A315DA
Another way to identify this problem is to look at the STACK 1+1 bootloader variable with the use of the set command in bootloader mode. To get the switch in bootloader mode, click the mode button while the switch starts to boot up.
switch: set
ABNORMAL_RESET_COUNT=0
AUTOREBOOT_RESTORE=1
BOARDID=20569
BOOT=flash:packages.conf
BSI=0
MAC_ADDR=00:ab:cd:ef:01
MANUAL_BOOT=yes
MODEL_NUM=C9300-48UXM
MODEL_REVISION_NUM=D0
MOTHERBOARD_ASSEMBLY_NUM=73-17959-06
MOTHERBOARD_REVISION_NUM=A0
MOTHERBOARD_SERIAL_NUM=XXXXXXXXXXX
RANDOM_NUM=1901228755
RET_2_RCALTS=
ROMMON_AUTOBOOT_ATTEMPT=3
STACK_1_1=2_0 <<<<<<<
SWITCH_IGNORE_STARTUP_CFG=1
SWITCH_NUMBER=2
SYSTEM_SERIAL_NUM=XXXXXXXXXXXX
TEMPLATE=access
VERSION_ID=V01
switch:
Solution
Unset the Stack 1+1 variable. After this switch is able to boot normally.
switch:unset STACK_1_1
switch: set
ABNORMAL_RESET_COUNT=0
AUTOREBOOT_RESTORE=1
BOARDID=20569
BOOT=flash:packages.conf
BSI=0
MAC_ADDR=00:ab:cd:ef:01
MANUAL_BOOT=yes
MODEL_NUM=C9300-48UXM
MODEL_REVISION_NUM=D0
MOTHERBOARD_ASSEMBLY_NUM=73-17959-06
MOTHERBOARD_REVISION_NUM=A0
MOTHERBOARD_SERIAL_NUM=XXXXXXXXXXX
RANDOM_NUM=1901228755
RET_2_RCALTS=
ROMMON_AUTOBOOT_ATTEMPT=3
SWITCH_IGNORE_STARTUP_CFG=1
SWITCH_NUMBER=2
SYSTEM_SERIAL_NUM=XXXXXXXXXX
TEMPLATE=access
VERSION_ID=V01
switch:
Once the Stack 1+1 bootloader variable is unset, then issue the boot command so that switch can boot from the boot variable set on the switch.
switch: boot
attempting to boot from [flash:packages.conf]
Located file packages.conf
#
##########################################################################################################################
Validate packages: SHA-1 hash:
calculated 550C9730:667B2788:DD6F6B06:D0FFA819:01A315DA
expected 550C9730:667B2788:DD6F6B06:D0FFA819:01A315DA
Both links down, not waiting for other switches
Switch number is 2
Related Information
For information about the Stack 1+1 mode, refer to 1:1 Redundancy.
Feedback