The 60xx series switches are actually not stackable.  Here is a list of the stackable PowerConnect switches:

• 3024

• 33xx

• 34xx

• 35xx

• 55xx

• 62xx

• M6220

• M6348

• 70xx

Dell PowerConnect stacking provides multiple switch management through a single point as if all stack members are a single unit. All stack members are accessed through a single IP address through which the stack is managed.

The PowerConnect switches with stacking capabilities can be stacked, or they can simply be stand-alone switches. Although stacking is accomplished using different cables and connectors, the concept is consistent across the PowerConnect line.

Switches in a stack are connected in one of two topologies:

• Stack Topology - Ring

• Stack Failover Topology - Chain

During the stacking setup, one switch is selected as the Stack Master and another stacking member can be selected as the Backup Master. All other devices are selected as stack members, and assigned a unique Unit ID.

Switch stacking and configuration is maintained by the Stack Master. The Master detects and reconfigures the ports with minimal operational impact in the event of unit failure, inter-unit stacking link failure, unit insertion, and the removal of a stacking unit.  The master unit is responsible for updating and synchronizing the backup master unit.

The member units on the 55xx switch will not function or forward traffic if it is not connected to a master unit.

thank you. i am using 6248 switches and not 60xx series.

further what is the difference between cx4 module and stacking module?

is cx4 module used these days? which one is more preferable?

The PowerConnect M8024k, 8024, and 8024F also support stacking when using firmware 4.2 or later.

All PowerConnect 62xx, 62xxP, 62xxF, and the M6220 support the same set of expansion modules, including the stacking module, which is a CX4 Stacking Module. This is the only Stacking module available for the 62xx. There is one other CX4 module for the 62xx, which is 10Gig ethernet.  

Both the Stacking CX4 and the 10GE CX4 modules can actually be configured to either role (Ethernet or Stacking). By default, each module functions according to its module ID.  Consult the 62xx Command Line Interface Guide at <ADMIN NOTE: Broken link has been removed from this post by Dell> for instructions on how to change roles, but it is only one or two commands, very straightforward. Upon changing the role of a module, a reboot will be required.

The guide also says the Stacking module will only install into Bay 1 (left bay when viewing from the back) of the 62xx.  

-V

thanks for your response.

with the stacking modules in ethernet mode on two 6248 switches, can i create a lag between the two switches.

i.e. between 1/xg1-1/xg2 on the two switches.

Yes, you should be able to set a lag on those ports once you have ethernet mode enabled.

when i change the stack ports to ethernet mode without configuring any VLANs (only management vLAN exists on the switch) and without defining a LAG, i am able to ping between the two switches.

now when i create VLAN (say 10) and also create a channel-group and allow VLAN 10 over the port-channel, the ping between the two switches stop!!

also in the next step i changed the management vLAN to 10, and tried the same thing! the ping between the two switches doesnt work agian.

any help appreciated

When you say you are allowing the vlan on the port channel are you setting up a trunk between the switches on the LAG?  You would run this on the Port channel interface on both switches.  This is Layer 2 allowing traffic across to both switches.

console(config-if)# switchport mode trunk

console(config-if)# switchport trunk allowed vlan add XX, XX

console(config-if)# end

Did you ever get this to work?

I am looking to do the same with the stacking modules