Setup a stack on Force10 S4810

Set stack switch priority on the switch you want as master

stack-unit 0 priority 14

Enable the stack groups, this will make a specific interface a stack-port ( see below for a mapping of ports to stack-group ).
In this case I am using the 40gig ports ( port 48 ). Once enabled you will not be able to use that port.

stack-unit 0 stack-group 12

accept the prompt/warning

Setting ports Fo 0/48 as stack group will make their interface configs obsolete after a reload.
[confirm yes/no]:yes

Save your config and reload ( both switches )

check your configuration

sh system
sh system stack-ports

**Physical port to stack-group mapping
**

10G ports

Ports 0-3 – stack-group 0
Ports 4-7 – stack-group 1
Ports 8-11 – stack-group 2
Ports 12-15 – stack-group 3
Ports 16-19 – stack-group 4
Ports 20-23 – stack-group 5
Ports 24-27 – stack-group 6
Ports 28-31 – stack-group 7
Ports 32-35 – stack-group 8
Ports 36-39 – stack-group 9
Ports 40-43 – stack-group 10
Ports 44-47 – stack-group 11

40G ports are numbered 48, 52, 56, and 60

Ports 48 – stack-group 12
Ports 52 – stack-group 13
Ports 56 – stack-group 14
Ports 60 – stack-group 15