Changing a Live Two-unit Stack to a Linear-topology Trunk

The ICX system performs numerous checks to block commands that could break a live stack. However, the checks have limitations and may not catch all potential breaks. Therefore, you should verify the physical connections on the stack before using the multi-stack-port or multi-stack-trunk command.

You can use the show stack connection command to check the physical connections of stacking ports (data port connections are not shown).

In a live system, you can configure the desired trunk on both units simultaneously using the multi-stack-trunk command.

In the following procedure, an ICX 7250 two-unit linear-topology stack is created as an example. Each ICX 7250 device has two potential linear-topology trunks, (x/2/1 to x/2/4) and (x/2/5 to x/2/8). When you configure either trunk, the system creates the specified trunk on each unit and removes the other stacking direction.

  1. Enter global configuration mode on the active controller. 
    ICX 7250# configure terminal
  2. Enter stack unit configuration sub-mode on the active controller. 
    ICX 7250(config)# stack unit 1
  3. Configure the desired trunk on each unit.
    Based on existing connections, specify one of the available trunk combinations.
    For example, in an ICX 7250 two-unit stack, based on connections, specify one of the following choices for each side of the trunk when entering the multi-stack-trunk command:
    • x/2/1 to x/2/4
    • x/2/5 to x/2/8 
    ICX 7250(config-unit-1)# multi-stack-trunk ethernet 1/2/1 to 1/2/4 and ethernet 2/2/1 to 2/2/4

    The system changes any existing stack-port or stack-trunk configuration to a four-port linear-topology trunk.

    In the example, both units form a bidirectional linear-topology stacking trunk on ports x/2/1 through x/2/4.

  4. Enter the write memory command to save the configuration. 
    ICX 7250(config-unit-1)# exit
ICX 7250(config)# write memory

The following example creates a linear-topology trunk and includes system responses. 

ICX7250-48P Router# configure terminal 
ICX7250-48P Router(config)# stack unit 1
ICX7250-48P Router(config-unit-1)# multi-stack-trunk ethernet 1/2/1 to 1/2/4 and ethernet 2/2/1 to 2/2/4
stack-trunk ethernet 1/2/1 to 1/2/4 replaces stack-trunk ethernet 1/2/1 to 1/2/2 and stack-trunk ethernet 1/2/3 to 1/2/4
stack-trunk ethernet 2/2/1 to 2/2/4 replaces stack-trunk ethernet 2/2/1 to 2/2/2 and stack-trunk ethernet 2/2/3 to 2/2/4
ICX7250-48P Router(config-unit-1)# exit

ICX7250-48P Router(config)# show running-config
Current configuration:
!
ver 09.0.00
!
stack unit 1
  module 1 icx7250-48p-poe-port-management-module
  module 2 icx7250-sfp-plus-8port-80g-module
  priority 128
  stack-trunk ethernet 1/2/1 to 1/2/4
  
stack unit 2
  module 1 icx7250-48p-poe-port-management-module
  module 2 icx7250-sfp-plus-8port-80g-module
  stack-trunk ethernet 2/2/1 to 2/2/4
  
stack enable
stack mac 609c.9f99.3f80
!
!
ICX7250-48P Router(config)# write memory
Parent topic: Configuring Two-unit Stack Linear-topology Trunks