Dell DF10MXL User's Guide download pdf (Page 11)

Stacking Dell Force10 MXL 10/40G Switches

listed here when in port mode. If there is no “stack-unit” listing for the first port

number, then the ports are not split and are running at 40GbE.

2. interface fortyGigE 0/33

interface TenGigabitEthernet 0/41

Each individual port mode is listed further down in the configuration. If the interface

is listed as fortyGigE then it may be used for stacking. If it is TenGigabitEthernet,

then it may not be used for stacking.

The command show interface status will also show which Ethernet mode each port is in and whether it

is 10Gb (Speed = Auto) or 40Gb (Speed = 40000 Mbit) . If the port is configured as a stack port, then

show interface status will not display any information about that port.

Master selection criteria

A Master is elected or re-elected based on the following considerations, in order:

1. The switch with the highest Priority at boot time.

2. The switch with the highest MAC address at boot time.

3. A unit is selected as Standby by the administrator, and a fail over action is manually initiated

or occurs due to a Master unit failure.

No record of previous stack mastership is kept when a stack loses power. As it reboots, the election

process will once again determine the Master and Standby switches. As long as the Priority hasn’t

changed on any members, the stack will retain the same Master and Standby.

Note: Each stack members’ role (including the Master and Standby) can be defined by the user at any

time by setting the Priority.

If the entire stack is powered OFF and ON again, the unit that was the Master before the reboot will

remain the Master after the stack resumes operation. However, when a stack is powered on, all

members are in “sleep” mode for 5 seconds while waiting on the previous Master to join the stack. If

the previous Master fails to join within 5 seconds, the remaining members (including the Standby) elect

a new Master.

Manually selecting a Master during initial stack setup

When using two or more switches to initially create a stack, the Master is chosen based on the highest

Priority first, then highest MAC address. To find the MAC address of a switch, type show system from a

CLI prompt:

FTOS#show system

Stack MAC : 00:1e:c9:cc:bb:21

Reload Type : normal-reload [Next boot : normal-reload]

-- Unit 0 --

Unit Type : Management Unit

Status : online

Next Boot : online

Required Type : MXL-10/40GbE - 34-port GE/TE/FG (XL)

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Dell DF10MXL User's Guide Page 11