Creating a Linear-topology Trunk on a Two-unit ICX 7850 Stack in a Live Environment

Note: If you try to expand a four-port trunk to an eight-port linear-topology trunk using stack interactive-setup, the default result would be a ring topology with two four-port trunks. The preferred method to create a linear-topology trunk is to use the multi-stack-trunk command.

Complete the following steps to create a two-unit ICX 7850 stack with a linear-trunk topology in a production environment.

  1. (Optional) Enter the show stack command and the show running-config command to check the stack configuration. 
    ICX7850-32Q 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: 3
Probing topology to find standalone units...
T=16m15.1: Sending probes to ports: u1: 1/3/5 to 1/3/8, u2: 2/2/5 to 2/2/8, 
Existing stack: ============================================================
    standby      active                                                        
     +---+        +---+                                                        
     | 2 |2/1==3/1| 1 |                                                        
     +---+        +---+                                                        

Stack interactive-setup detects 4 new links (classified to 1 logical link) between existing units.
Logical Link #0: U1--U2: 4 link(s): 1/3/5--2/2/5 1/3/6--2/2/6 1/3/7--2/2/7 1/3/8--2/2/8
It will add (stack-trunk ethernet 1/3/5 to 1/3/8) and add (stack-trunk ethernet 2/2/5 to 2/2/8)
The topology will become a ring.

Do you accept above new link(s)? (enter 'y' or 'n'): n
    The following example shows a two-unit stack with a four-port stacking trunk. 
    
ICX7850-32Q Router# show stack
T=16m0.6: alone: standalone, D: dynamic cfg, S: static
ID   Type          Role    Mac Address    Pri State   Comment                   
1  S ICX7850-32Q   active  d4c1.9e18.3731 128 local   Ready
2  S ICX7850-48FS  standby d4c1.9e18.8dd9   0 remote  Ready

    standby      active                                                        
     +---+        +---+                                                        
     | 2 |2/1==3/1| 1 |                                                        
     +---+        +---+                                                        
Will assign standby in 55 sec due to all ready

Standby u2 - protocols ready, can failover
Role history: N: standalone, A: active, S: standby, M: member
U1: N->A

Current stack management MAC is d4c1.9e18.3731

ICX7850-32Q Router# show running-config
Current configuration:
!
ver 09.0.00
!
stack unit 1
  module 1 icx7850-32q-port-management-module
  module 2 icx7800-100g-12port-1200g-module
  module 3 icx7800-100g-8port-800g-module
  priority 128
  stack-trunk ethernet 1/3/1 to 1/3/4
  
stack unit 2
  module 1 icx7850-48fs-port-management-module
  module 2 icx7800-100g-8port-800g-module
  stack-trunk ethernet 2/2/1 to 2/2/4
  
stack enable
stack mac d4c1.9e18.3731
!
!
  2. In stack unit configuration sub-mode, enter the multi-stack-trunk command followed by the range of ports on both ends of a connection to form the desired stacking trunk. To create a full linear-topology trunk, enter the full range of eight ports on both end as shown in the following example.
    The example expands the existing four-port trunk to an eight-port trunk. 
    ICX7850-32Q Router# configure terminal
ICX7850-32Q Router(config)# stack unit 1
ICX7850-32Q Router(config-unit-1)# multi-stack-trunk ethernet 1/3/1 to 1/3/8 and ethernet 2/2/1 to 2/2/8
stack-trunk ethernet 1/3/1 to 1/3/8 replaces stack-trunk ethernet 1/3/1 to 1/3/4
stack-trunk ethernet 2/2/1 to 2/2/8 replaces stack-trunk ethernet 2/2/1 to 2/2/4
ICX7850-32Q Router(config-unit-1)# end
  3. Enter the write memory command to save the configuration. 
    ICX7850-32Q Router# write memory
Flash Memory Write (8192 bytes per dot) 
Write startup-config done.

Automatic copy to member units:  2
Flash Memory Write (8192 bytes per dot) 
.
Copy Done.
  4. (Optional) Enter the show stack command and the show running-config command to check that the topology has changed from a four-port trunk to an eight-port linear-topology trunk. 
    ICX7850-32Q Router# show stack
T=19m38.6: alone: standalone, D: dynamic cfg, S: static
ID   Type          Role    Mac Address    Pri State   Comment                   
1  S ICX7850-32Q   active  d4c1.9e18.3731 128 local   Ready
2  S ICX7850-48FS  standby d4c1.9e18.8dd9   0 remote  Ready

    standby      active                                                        
     +---+        +---+                                                        
     | 2 |2/1==3/1| 1 |                                                        
     +---+        +---+                                                        
Will assign standby in 19 sec due to all ready

Standby u2 - protocols ready, can failover
Role history: N: standalone, A: active, S: standby, M: member
U1: N->A

Current stack management MAC is d4c1.9e18.3731

ICX7850-32Q Router# show running-config
Current configuration:
!
ver 09.0.00
!
stack unit 1
  module 1 icx7850-32q-port-management-module
  module 2 icx7800-100g-12port-1200g-module
  module 3 icx7800-100g-8port-800g-module
  priority 128
  stack-trunk ethernet 1/3/1 to 1/3/8
  
stack unit 2
  module 1 icx7850-48fs-port-management-module
  module 2 icx7800-100g-8port-800g-module
  stack-trunk ethernet 2/2/1 to 2/2/8
  
stack enable
stack mac d4c1.9e18.3731
!
!
Parent topic: ICX 7850 Stack Configuration Overview