Technical data

FastIron Ethernet Switch Administration Guide 107
53-1002637-02
Hitless management on the FSX 800 and FSX 1600
3
Hitless OS upgrade on the FSX 800 and FSX 1600
Hitless Operating System (OS) Upgrade enables an operating system upgrade and switchover
without any packet loss to the services and protocols that are supported by Hitless management.
What happens during a Hitless OS upgrade
The following steps describe the internal events that occur during a hitless OS upgrade.
1. The standby management module resets and reloads with the new software image in its flash
memory.
2. The Ethernet interfaces (if present) on the standby module become operational and start
carrying data traffic.
3. The active management module synchronizes the standby management module with all the
information required to take over the active role.
4. The Layer 2 and Layer 3 control protocols on the standby management module converge. This
process takes approximately 70 seconds.
5. The standby management module takes over the active role.
6. The old active management module resets and reloads with the same software image running
on the newly active management module.
7. The FastIron switch is now operating with the new software image. The management module
that was initially configured as the standby management module is now the active
management module and the management module that was initially configured as the active
management module is now the standby.
NOTE
The events described above occur internally and do not create or affect the external network
topology.