Dell Force10 S2410-01-10GE-24P Configuration Manual page 88

All of the forwarding protocols run on the management unit. The subordinate units do not run the full
stack. The forwarding database resides on the management unit, which then synchronizes the forwarding
tables in the other units in the stack. The individual units in the stack then make individual forwarding
decisions based on their local copy of the forwarding table.
If a management unit is lost, and a new unit assumes the role of manager for the stack, there is some
disruption to traffic as the new management unit is elected, and forwarding tables are flushed and then
relearned.
The stacking ports switch traffic between units at a rate of 10 Gbps. Since each unit supports 48 x 1 Gbps
ports, and two optional 10 Gbps ports, the switching capacity between units is oversubscribed.
The ring topology provides some performance gains. For example, a two-unit stack with two cables is able
to exploit the full bandwidth of both stacking ports, effectively giving 20 Gbps between the units. Ring
topology performance gains in larger stacks (4+) will probably not be as great, since transitional traffic will
share bandwidth with traffic destined to, or originating from, a given switch.
To display the status of the stacking ports, execute the
example, the redundant connection that completes a ring topology is missing.):
Figure 5-55. Example Output from show stack-port Command on an S50
Force10 #show stack-port
Unit
---- ---------------- ---------- ---------- ------------ ------------
1
1
2
2
To display the status of units in the stack and which version of software they are running, use the
switch command:
Figure 5-56. Example Output from show switch Command
Force10 #show switch
Switch
------ ------------ ------------- ------------- --------------------- --------
1 Mgmt Switch
2 Stack Member SA-01-GE-48T
88 | Stacking S-Series Switches
Configured Running
Stack
Interface Mode
Stack Port A N/A
Stack Port B N/A
Stack Port A N/A
Stack Port B N/A
Management Preconfig
Status Model ID
SA-01-GE-48T
show stack
Stack Link
Mode Status
Stack Link Down 10
Stack Link Up 10
Stack Link Up 10
Stack Link Down 10
Plugged-in Switch
Model ID Status
SA-01-GE-48T OK
SA-01-GE-48T OK
or show stack-port command (In this
Link
Speed (Gb/s)
Code
Version
2.3.1.5
2.3.1.5
show
Manager
Member