Management and Configuration Guide K/KA/KB.15.15

2. The module that was hotswapped in then reboots if necessary to primary or secondary flash,
whichever matches (if it does not already match.)
3. After the hotswapped management module finishes booting, it is sent the config and other
critical files from the active management module.
4. The hotswapped management module goes into standby mode and is ready to take over in
case of a switchover.
NOTE: After the boot standby command is executed, if the software versions on the active
management module and the standby management module are not compatible, the standby module
does not sync with the active management module. The standby module then enters warm-standby
redundancy mode.
Other software version mismatch conditions
The following steps describe the behavior that may when a new software image is installed in
secondary flash of the AMM and a redundancy switchover command is executed.
1. A new software image, K.15.04.0002 containing ROM upgrade K.15.12 is installed in
secondary flash of the AMM/MM1.
2. The AMM/MM1 automatically syncs the images to the secondary flash in the SMM/MM2.
Now both AMM/MM1 and SMM/MM2 have identical software and ROM in secondary
flash.
3. The SMM/MM2 is booted from secondary. It boots into the new K.15.04.0002 software
version. The new ROM is applied and the SMM/ MM2 reboots.
4. After the SMM/MM2 finishes rebooting, it reconnects to the AMM/MM1 and prepares to
take the standby role by rebooting.
5. However, the AMM/MM1 is running software version K.15.03.0008 in its primary flash,
and the SMM/MM2 is running software version K.15.04.0002 in its secondary flash, so the
SMM/MM2 pauses its reboot because of the software mismatch.
6. If a redundancy switchover command is executed, the AMM/MM1 will give control to
the SMM/MM2, which can then finish booting and become the new AMM/MM2. This is the
warm-start behavior.
7. The SMM/MM1 (former AMM/MM1) reboots, but unless the reboot is executed from secondary
flash, it reboots into primary flash, which contains the older software version K.15.03.0008
with no ROM upgrade.
8. If the SMM/MM1 is forced to boot from secondary before executing the redundancy
switchover command, it will boot into the new K.15.04.0002 software and upgrade the
ROM. After the reboot that occurs with the ROM upgrade, the SMM/MM1 connects to the
new AMM/MM2 and takes the standby role.
About downloading a new software version
File synchronization after downloading
After downloading a new software version to either the primary or secondary flash of the active
management module, the software version is immediately copied to the corresponding flash (primary
or secondary) of the standby module, unless the standby module failed selftest or redundancy was
disabled with the no redundancy management-module command.
The configuration files, including which configuration file to use for that flash image, are
synchronized. For example, if the active management module is using config1, the standby
module is also synchronized to use config1.
488 Chassis Redundancy (8200zl Switches)