Lenovo RackSwitch G8264 Application Manual page 304

5. On each switch, perform a reboot:
6. Physically connect the stack LAGs.
ring topology
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G8264 Application Guide for ENOS 8.4
To create the recommended topology, dedicate at least two 10Gb or 40Gb ports on
each switch to stacking. By default, 10Gb or 40Gb Ethernet ports 1 and 5 are used.
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>
Notes:
 Ports configured as Server ports for use with VMready cannot be designated as
stacking links.
 You must configure all higig ports as 10Gb or 40 Gb ports.
RS G8264(config)# reload
To create the recommended topology, attach the two designated stacking links in a
bidirectional ring. As shown in Figure
starting with the Master switch. To complete the ring, connect the last Member
switch back to the Master.
Figure 25. Example of Stacking Connections
Switches
connected in
bidirectional
Note: The stacking feature is designed such that the stacking links in a ring
topology do not result in broadcast loops. The stacking ring is thus valid (no
stacking links are blocked), even when Spanning Tree protocol is enabled.
When two units are connected with multiple stacking links, the links are
automatically added as members of a higig LAG.
Once the stack LAGs are connected, the switches will perform low‐level stacking
configuration.
Note: Although stack link failover/failback is accomplished on a sub‐second basis,
to maintain the best stacking operation and avoid traffic disruption, it is
recommended not to disrupt stack links after the stack is formed.
25, connect each switch in turn to the next,
Master
Switch
Member
Switch
Member
Switch
Member
Switch