Cisco CATALYST 2960 - Stack MAC Address; The MAC address of the master determines the stack MAC address.; When the stack initializes, the MAC address of the master determines the bridge ID that identifies the stack in the network.; If the master changes, the MAC address of the new master determines the new bridge ID. However, when the persistent MAC address feature is enabled, there is an approximate 4-minute delay before the stack MAC address changes. During this time period, if the previous master rejoins the stack, the stack continues to use its MAC address as the stack MAC address, even if the switch is now a member and not a master. If the previous master does not rejoin the stack during this period, the stack takes the MAC address of the new stack master as the stack MAC address. See the “Enabling Persistent MAC Address” section on page 7-17 for more information.

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Catalyst 2960 Switch Command Reference
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Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
mdix auto
Related Commands Command Description
show controllers
ethernet-controller
interface-id phy
Displays general information about internal registers of an interface,
including the operational state of auto-MDIX.