Stage 3 - Management Card Upgrade; Stage 4 - Reboot All Packet Processing Cards - Cisco ASR 5000 Administration Manual

On-Line Software Upgrade
• No AAA packets or logs will be sent for each session reject or redirect
• All other packets are discarded
• Port counters will be unavailable
• Port redundancy operations, if configured, will not be operational
• All routing protocols, if enabled and configured, will be disabled
• Routing tables will remain fixed (no updates) throughout the upgrade
• PCF monitoring will be unavailable
Important
Once all of the packet processing cards are operating in stand-alone mode, the on-line software upgrade can
proceed.

Stage 3 - Management Card Upgrade

During this stage, the system performs an SMC switchover, wherein all tasks running on the active SMC are
transferred to the standby SMC, which then becomes active and takes control of the system.
The new standby SMC is then restarted and the new operating system software image is loaded onto that
SMC. It is important to note that the full CLI configuration that was temporarily saved by the system is not
loaded at this point. Instead, only minimal commands used to control the system are loaded.
Once this SMC is operational, another SMC switchover occurs and the second SMC is restarted, loading the
new software version. During this period, since both SMC are effectively now running the new operating
system software image, the system can continue to perform the on-line software upgrade process without
waiting until the last SMC finishes booting up and is placed into its normal standby operational mode.

Stage 4 - Reboot All Packet Processing Cards

In this stage, the active SMC is aware of all system and card-level states and tasks. All packet processing
cards that are in standby operational mode are restarted simultaneously, and after passing their Power On Self
Test (POST) diagnostics, their control processors (CPs) are loaded with the new operating system software
image.
The remaining packet processing cards, which may be enforcing overload policies that prevent any new
sessions from entering the system, are then migrated to the cards that are running the new operating system
software. The overload policies and minimal system tasks continue running on the newly upgraded packet
processing cards. The original active packet processing cards are then restarted, all at once, and upgraded to
the new operating system software image.
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Once Stage 2 has begun, no CLI configuration mode commands, except end and exit
(if this stage is entered while a management user is in a configuration mode) will be
accepted by the system. Only non-configuration commands within the Exec mode, such
as show commands may be executed. You can monitor the progress of the on-line
software upgrade by entering the show upgrade command.
Software Management Operations