Lenovo RackSwitch G8264 Application Manual page 314

5. Set the stacking mode.
6. Configure the stacking VLAN on the new switch, or use the default setting.
7. Designate the stacking links.
8. Attach the required stack link cables to the designated stack links on the new
9. Attach the desired network cables to the new switch.
10. Reboot the new switch:
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G8264 Application Guide for ENOS 8.4
By default, each switch is set to Member mode. However, if the incoming switch
has been used in another stacking configuration, it may be necessary to ensure the
proper mode is set.
 If replacing a Member or Backup switch:
RS G8264(config)# boot stack mode member
If replacing a Master switch:

RS G8264(config)# boot stack mode master
Although any VLAN may be defined for stack traffic, it is highly recommended
that the default, VLAN 4090, be reserved for stacking, as shown in the following
command.
RS G8264(config)# boot stack vlan 4090
It is recommended that you designate the same number of 10Gb or 40Gb ports for
stacking as the switch being replaced. By default, 10Gb or 40Gb Ethernet ports 1
and 5 are used. At least one 10Gb or 40Gb port is required.
Use the following command to specify the links to be used in the stacking LAG:
RS G8264(config)# boot stack higig­trunk <list of port names or aliases>
switch.
RS G8264(config)# reload
When the new switch boots, it will join the existing stack. Wait for this process to
complete.