Specify the Primary CPU and the Standby Delay

About this task

Configure the standby delay to set the number of seconds a standby CPU waits before trying to become the primary CPU. The standby delay applies when two CP modules boot at the same time. The designated standby CP waits for the configured number of seconds before attempting to assert itself as the primary. Only one CP can be the primary in a chassis.

Caution

If you configure the standby delay to too short a value, the configured standby CP can become a primary. If you configure the standby delay to too long, it can delay the standby CP asserting itself and continue booting when the designated CP is inserted, but fails booting.

1. Enter Global Configuration mode:

   enable

   configure terminal

2. View the current configuration for the primary CPU:

   show boot config master

3. Specify the slot of the primary CPU:

   boot config master <1–2>

4. Save the changed configuration.
5. Configure the number of seconds a standby CPU waits before trying to become the primary CPU:

   boot config delay <0–255>

6. Save the changed configuration.
7. Restart the switch.

Example

Switch:1>enable
Switch:1#configure terminal

Specify the slot number, either 1 or 2, for the primary CPU:

Switch:1(config)# boot config master 2
Switch:1(config)# save config

Specify the number of seconds a standby CPU waits before trying to become the primary CPU:

Switch:1(config)# boot config delay 30
Switch:1(config)# save config
Switch:1(config)# reset