FAQ: inserting two more switches into a stack system

Publication Date:  2014-08-22 Views:  183 Downloads:  0
Issue Description
This is guide about how to add two more switches into a stacking system avoiding business impact.  We will use S5700 LI switches and we will use service interfaces. 

Let's consider the following stacking system composed by S5700 LI switches connected using service interfaces.
Stack port configuration:

Alarm Information
Handling Process
We will need to add the third unit  SWT3 (S5700LI) having below stack-port configuration and using Xgi2/0/4 we will connect it to xGi1/0/3.

1. Add Xgi1/0/3 to stack-port 1/1

2. Save and power off SWT3
3. Plug in the stack cable. (between XGigabitEthernet2/0/4 and XGigabitEthernet1/0/3)
4. Power on SWT3

SWT1 and SWT2 are still running.
The new stack system, with 3 switches.

The stack-port configuration:

Now we will add the forth unit SWT4. We will configure stack-port as below, using XGigabitEthernet3/0/4 to connect with XGigabitEthernet2/0/3.

1. save and power off SWT4
2. plug the stack cable between Xgi3/0/4 and Xgi2/0/3
3. power on SWT4.

The stack system is still running while adding the new device.

wait for a couple of minutes....

Stack port configuration:

Stack topology:

Hope you will find this case useful!

Root Cause