Brocade FastIron Ethernet Switch Stacking Configuration Guide - Manual (Page 46)

trunk, and other side of the ports does not. A trunk-to-port connection can result in packet drops and
can potentially break a stacking link.
The primary ports of the stack trunk must be connected and in an up status to enable the multi-stack-
trunk command. If the primary stack trunk ports are not connected and not in an up status, the
command is rejected and the following error message is displayed on the CLI.
Error- Primary trunk port 1/2/3 is not UP; removing the trunk might break the stack
To upgrade to a double port trunk configuration, enter the multi-stack-trunk command under the
stack unit configuration level. Enter the following command.
device(config)#stack unit 1
device(config-unit-1)# multi-stack-trunk 1/2/3 to 1/2/4 and 2/2/1 to 2/2/2
device(config-unit-1)#stack unit 2
device(config-unit-2)# multi-stack-trunk 2/2/3 to 2/2/4 and 3/2/1 to 3/2/2
Syntax: [no] multi-stack-trunk
Use the no form of the command to disable the configuration of the two connected stack trunk ports.
Displaying multi-trunked stacking configuration
When upgrading to a double port trunk configuration using the multi-stack-trunk command, the
configuration is not saved in the running or start-up configuration. Instead, the configuration for the
multi-stack-trunk command is saved as stack-trunk ports. Use the show running-config command
to display the configuration for multi-trunked stacking ports. For example, the following command is
entered.
device(config-unit-1)# multi-stack-trunk 1/2/3 to 1/2/4 and 2/2/1 to 2/2/2
The running or start-up configuration displays the following configuration for the show running-config
command.
device#show running-config
stack unit 1
module 1 icx6450-48p-poe-port-management-module
module 2 icx6450-sfp-plus-4port-40g-module
stack-trunk 1/2/3 to 1/2/4
stack-port 1/2/1 1/2/3
stack unit 2
module 1 icx6450-24-port-management-module
module 2 icx6450-sfp-plus-4port-40g-module
stack-trunk 2/2/1 to 2/2/2
stack-port 2/2/1 2/2/3
Periodic background stack diagnosis for ICX 6430 and ICX 6450
devices
After a stack forms, the system periodically probes the topology to check the connections between
units of this stack. It can detect the following errors. The purposes are to detect user's connection
problem and hardware failures. Error messages are printed about every 10 minutes. If there is no
printout, there is no problem. This diagnosis runs in the background.
Manually triggering stack diagnosis
You can manually trigger the diagnosis using the show stack connection command.
Displaying multi-trunked stacking configuration
44 FastIron Ethernet Switch Stacking Configuration Guide
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