Cisco Catalyst 2960 Series, Configuration Manual

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Note • If we connect a Horizontal stack port to a normal network port on other end, stack port
transmission/reception will be disabled within 30 seconds if there are no SDP packet received from
the other end.
• Stack port will not go down but only transmission/reception will be disabled. The log message shown
below will be displayed on the console. Once the peer end network port is converted to stack port,
transmission/reception on this stack port will be enabled.
%STACKMGR-4-HSTACK_LINK_CONFIG: Verify peer stack port setting for
hstack StackPort-1 switch 5 (hostname-switchnumber)
Stack Member Priority Values
A higher priority value for a stack member increases the probability of it being elected active switchstack
master and retaining its stack member number. The priority value can be 1 to 15. The default priority value
is 1. You can display the stack member priority value by using the
show switch EXEC command.
We recommend assigning the highest priority value to the switch that you prefer to be the active switchstack
master. This ensures that the switch is reelected as the active switchstack master if a reelection occurs.
Note
To change the priority value for a stack member, use the
switch stack-member-number priority new
priority-value global configuration command. For more information, see the “ Setting the Stack Member
Priority Value
”
section.
The new priority value takes effect immediately but does not affect the current active switchstack master. The
new priority value helps determine which stack member is elected as the new active switchstack master when
the current active switchstack master or the switch stack resets.
Switch Stack Bridge ID and MAC Address
The MAC address of the active switchstack master determines the stack MAC address.
When the stack initializes, the MAC address of the active switchstack master determines the bridge ID that
identifies the stack in the network.
If the active switchstack master changes, the MAC address of the new active switchstack master determines
the new bridge ID and stack MAC address.
If the entire switch stack reloads, the switch stack uses the MAC address of the active switchstack master.
Persistent MAC Address on the Switch Stack
You can use the persistent MAC address feature to set a time delay before the stack MAC address changes.
During this time period, if the previous active switch rejoins the stack, the stack continues to use its MAC
address as the stack MAC address, even if the switch is now a stack member and not an active switch. If the
previous active switch does not rejoin the stack during this period, the switch stack takes the MAC address
of the new active switch as the stack MAC address. By default, the stack MAC address will be the MAC
address of the first active switch, even if a new active switch takes over.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
723
Information About Switch Stacks