Building a Two-unit Stack with a Linear-topology Trunk Using Stack Interactive-setup

The interactive-setup utility generates the linear-topology trunk option only when either of the following conditions is met:
  • All ports of the linear-topology trunk are connected.
  • The active controller has a linear-topology trunk configuration.
The following procedure uses an ICX 7250 stack as an example. A two-unit ICX 7250 stack has two potential linear-topology trunks, (x/2/1 to x/2/4) and (x/2/5 to x/2/8).

Complete the following steps to configure a two-unit linear-topology trunk using stack interactive-setup.

  1. Connect cables between the two units. (In this example, four cables are used as shown in ICX 7250-24P two-unit stack with linear-topology trunk as configured in example.)
  2. On the unit you want to become the active controller, enable stacking. 
    ICX7250# configure terminal
ICX7250(config)# stack enable
ICX7250(config)# exit
  3. On the same unit, run the stack interactive-setup utility.
    Note: For more information on the stack interactive-setup utility, refer to The stack interactive-setup utility. 
    ICX7250# stack interactive-setup
You can abort stack interactive-setup at any stage by <ctrl-c>
0: quit
1: change stack unit IDs
2: discover and convert new units (no startup-config flash) to members
3: discover and convert existing/new standalone units to members
2&3 can also find new links and auto-trunk or convert chain(s) to ring.
Please type your selection: 2
    The system detects that all ports of a candidate linear-topology trunk are connected. Then it displays an option for you to choose a ring (y) or a linear-topology trunk (n).
  4. When prompted by the system, enter n to create a linear-topology trunk.

    The unit running stack interactive-setup reloads the other unit as a stack member.

    A two-unit stack forms when the member boots up and joins the stack.

  5. Enter the write memory command to save the learned configuration. 
    ICX7250# write memory

The following example shows the creation of a two-unit ICX 7250 stack with a linear-topology trunk using stack interactive-setup. 

ICX7250-48P Router> en
No password has been assigned yet...
ICX7250-48P Router# show running-config
Current configuration:
!
ver 08.0.90
!
stack unit 1
  module 1 icx7250-48p-poe-port-management-module
  module 2 icx7250-sfp-plus-8port-80g-module
  stack-port 1/2/1
  stack-port 1/2/3
!
!
end

ICX7250-48P Router# stack interactive-setup 
You can abort stack interactive-setup at any stage by <ctrl-c>
0: quit
1: change stack unit IDs
2: discover and convert new units (no startup-config flash) to members
3: discover and convert existing/new standalone units to members
2&3 can also find new links and auto-trunk or convert chain(s) to ring.
Please type your selection: 2
Sending probes to ports: u1: 1/2/1 to 1/2/8, 
Existing stack: ============================================================
                                                                               
     +---+                                                                     
  2/1| 1 |2/3                                                                  
     +---+                                                                     


Horizontal bars link to discovered units. Vertical bars link to stack units.


Chain #0: ==================================================================
#1: icx7250-48p-poe-port-management 609c.9f99.1988

     1/2/1                                                                     
      ||                                                                       
      ||                                                                       
      2/1                                                                      
     +---+                                                                     
     |#1 |                                                                     
     +---+                                                                     
                                                                                
Discovered 1 chain/ring
Chain #0: Do you want to select this chain? (enter 'y' or 'n'): y
#1: icx7250-48p-poe-port 609c.9f99.1988, type an ID (No: 0, default: 2): 

You selected 1 unit(s): #1: ID=2,  

Links U1--U2, #=4: 2/1--2/1, 2/2--2/2, 2/3--2/3, 2/4--2/4, 

There are total two units. The connections qualify a linear-topo that puts all discovered links to a trunk.
Do you want a ring? (y: ring, n: linear-topo chain) (enter 'y' or 'n'): n

                   #1                                                          
     +---+        +---+                                                        
     | 1 |2/1==2/1| 2 |                                                        
     +---+        +---+                                                        
Proceeding will produce the above topology. Do you accept it? (enter 'y' or 'n'): y
stack interactive-setup discovers 1 unit(s) and sends stack-port/trunk to chain 0: linear-topo: 2/1 to 2/4

stack-trunk 1/2/1 to 1/2/4 replaces stack-port 1/2/1 and stack-port 1/2/3

Configuration changed. Please do "write memory".

ICX7250-48P Router#

The other units reloads, becomes a member, and joins the stack. 

T=6m9.2: Election, was alone --> active, ID=1, pri=128, 2U(1-2), A=u1, nbr#=1 0, reason: u2: enable, , 
T:6m11.3: Done hot swap: active controller u1 sets u2 to Ready.
T=6m12.0: Election, was active, no change, ID=1, pri=128, 2U(1-2), A=u1, nbr#=1 0, reason: u1: stk-po-chg, , 
Config changed due to add/del units. Do write mem if you want to keep it
T=7m12.7: Assigned unit 2 to be standby
ICX7250-48P Router# write memory 

 There is no startup config file, unable to save legacy config 

Automatic copy to member units:  2
Flash Memory Write (8192 bytes per dot) 
.
Copy Done.
ICX7250-48P Router#

================Unit 2 Log=================================
ICX7250-48P Router#Unit 1 receives stack interactive-setup from U1, mac=609c.9f99.3f80
ID=2 D0=2/1 to 2/4, , will reload from Primary in 20 sec
Unmounting the External USB
We are in system reset

#### Bootup printout is snipped

The system : started=warm start   reloaded=by "reload"
My stack unit ID = 2, bootup role = member


[MEMBER]local-2@ICX7250-48P Router>
Creating certificate, please wait...

SSL Client Certificate is successfully created

[MEMBER]local-2@ICX7250-48P Router>

T=48.5: Election, was member, no change, ID=2, pri=0, 2U(1-2), A=u1, nbr#=1 0, reason: u1: stk-po-chg, , 
Unit 2 becomes ready
Connecting to active controller 1 console...(Press Ctrl Shift -  x to exit)
T=51.5: Election, was member, no change, ID=2, pri=0, 2U(1-2), A=u1, nbr#=1 0, reason: u1: stk-po-chg, , 

ICX7250-48P Router>
UNIT2:T=1m52.0: Unit 2 is assigned standby by active u1.
 
T=1m54.2: Standby u2 start parsing running config from active controller u1
T=1m54.5: Standby u2 finished parsing running config from active controller u1.
T:1m56.8: Done hot swap: standby controller u2 sets u1 to Ready.
Download request from active unit 1 mac = 609c.9f99.3f80

UNIT2:T=2m54.6: U2 received startup config flash sync. 
Done.
Parent topic: Configuring Two-unit Stack Linear-topology Trunks