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5–Customer Replaceable Units
Replacing CPU Blades
5-10 59229-05 A
5. Observe the new primary CPU blade Heartbeat LED. It should blink once
per second. If the Heartbeat LED is showing a different blink pattern, refer to
diagnostic procedures in the installation guide, or contact your authorized
maintenance provider.
6. Install the new secondary CPU blade. Remove protective coverings from the
backplane connectors. Open the CPU blade latch and slide the CPU blade
into the chassis until it makes contact with the midplane connector. Rotate
the latch to lock the CPU blade in place. When the switch becomes
operational, the firmware and switch configuration will automatically transfer
to the new CPU blade. Upgrading firmware will take a few minutes and
complete by resetting the CPU blade.
7. Reconnect the Ethernet, serial port, and HyperStack cables.
8. Log in to the switch again using the original IP address.
9. Observe the CPU blade Heartbeat LED. It should blink once per second. If
the Heartbeat LED is showing a different blink pattern, refer to “Error Code
Blink Patterns” on page 4-2 for diagnostic information.
10. Verify the POST results. Open a Telnet session and enter the Show Blade
command to display the diagnostic status for the CPU blade.
Fault Tolerant – Primary CPU Blade Replacement
With a switch that is licensed for Fault Tolerance, you can transfer control to the
secondary CPU blade, then remove the primary CPU blade; or simply remove the
primary CPU blade while the switch is running–control transfers automatically.
You can determine the primary CPU by locating the illuminated CPU Primary LED.
You can also determine the primary CPU blade, by entering the Show Blade
command and looking for the “+” opposite the primary CPU blade.
1. Enter the Show Version command to verify that SecondaryCPUStatus is
HotStandby. Control will not transfer unless the secondary CPU status is
HotStandby.
Optional: Enter the Switchover CLI command to explicitly transfer control to
the secondary CPU blade, then proceed to “Secondary CPU Blade
Replacment” on page 5-11. Otherwise, proceed to Step 2.
2. Disconnect the Ethernet, serial, and HyperStack cables from the primary
CPU blade.
3. Rotate the latch to the partial open position until the blue Hotswap LED
begins flashing. Wait for the Hotswap LED to illuminate continuously, then
open the latch fully and pull the CPU blade by the latch to disengage the
blade from the midplane. The secondary CPU blade automatically becomes
primary.