Cisco Systems 3130 User Manual

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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter 5      Managing Switch Stacks
Configuring the Switch Stack
If you enter a time delay of 1 to 60 minutes, the stack MAC address of the previous stack master is 
used until the configured time period expires or until you enter the no stack-mac persistent timer 
command.
Note
If the entire switch stack reloads, it uses the MAC address of the stack master as the stack MAC address.
Beginning in privileged EXEC mode, follow these steps to enable persistent MAC address. This 
procedure is optional.
Use the no stack-mac persistent timer global configuration command to disable the persistent MAC 
address feature.
This example shows how to configure the persistent MAC address feature for a 7-minute time delay and 
to verify the configuration:
Switch(config)# stack-mac persistent timer 7
WARNING: The stack continues to use the base MAC of the old Master
WARNING: as the stack MAC after a master switchover until the MAC
WARNING: persistency timer expires. During this time the Network
WARNING: Administrators must make sure that the old stack-mac does
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
stack-mac persistent timer [0 | 
time-value]
Enable a time delay after a stack-master change before the stack MAC 
address changes to that of the new stack master. If the previous stack 
master rejoins the stack during this period, the stack uses that MAC 
address as the stack MAC address.
Enter the command with no value to set the default delay of 
approximately 4 minutes. We recommend that you always configure 
a value.
Enter 0 to continue using the MAC address of the current stack 
master indefinitely.
Enter a time-value from 1 to 60 minutes to configure the time period 
before the stack MAC address changes to the new stack master. 
Note
When you enter this command, a warning states that traffic 
might be lost if the old master MAC address appears elsewhere 
in the network domain.
If you enter the no stack-mac persistent timer command after a new 
stack master takes over, before the time expires, the switch stack moves 
to the current stack master MAC address.
Step 3
end
Return to privileged EXEC mode.
Step 4
show running-config
or
Verify that the stack MAC address timer is enabled. If enabled, the 
output shows 
stack-mac persistent timer 
and the time in minutes.
Step 5
 show switch
If enabled, the display includes:
Mac persistency wait time
, the number of minutes configured, and 
the current stack MAC address.
Step 6
copy running-config startup-config
(Optional) Save your entries in the configuration file.