In an Extended Edge on stacking environment, this command shows Virtual Port Extender (VPEX) information for all nodes in the topology.
| vpex | Specifies Virtual Port Extender (VPEX). | 
| stacking | Specifies VPEX stacking information. | 
N/A.
This command is only available in dot1BR controlling bridges and not available on other stackables.
The following example shows VPEX stacking information:
Node MAC Address   Slot Flags
    ------------------ ---- -----
    *00:11:22:33:44:55  1   eEmc-
     00:00:44:33:22:11  2   e--c-
     00:99:88:77:66:55  3   e--cA
* - Indicates this node
Flags: (e) VPEX enabled setting is on, (E) VPEX is Active,
       (m) VPEX MLAG mode is configured, (c) VPEX-capable node,
       (A) Active stack node
        This command was first available in ExtremeXOS 31.4.