Stack Master Election - Dell C9000 Series Networking Configuration Manual

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Although the master and standby units are automatically selected by MAC address, you can configure PE

priorities to specify which units are assigned the master and standby roles.

Stack Master Election

When a PE stack reloads and all stack units come up, all units participate in the stack master election. The

master and standby units are chosen based on the priority or MAC address. The stack takes the MAC address

of the master unit.

Unit priority — The range is from 1 to 14. The unit with the highest priority is elected the master

management unit; the unit with the second highest priority is elected the standby unit. The default is 0.

To remove a priority and set the priority to 0, enter the no stack-unit unit-number priority

command in PE CONFIGURATION mode.

MAC address (if there is a priority tie) — By default, the unit with the highest MAC value becomes the

master unit if no priorities are configured.

A change in the stack master occurs when:

You power down the stack master.

A failover of the master switch occurs.

You disconnect the master switch from the stack.

If a stack unit does not boot up at the same time as the other units, it does not participate in the

election process. Units that boot up late do not participate in the election process because the master

and standby have already been elected. The unit that boots up late (even if they have a higher priority

configured) joins as a member.

To display the PE stack master, enter the show pe pe—id system brief command.

The following example shows output from an established stack.

Example of Displaying Stack Members

Dell#show pe 0 system brief

Stack MAC: a0:68:00:3f:92:bc

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Port Extender (PE) Stacking