Configuration Guide User guide

286 FastIron Configuration Guide
53-1002494-02
Brocade IronStack management
Persistent MAC address for the IronStack
The MAC address for the entire IronStack is determined by the MAC address of the Active
Controller. When an Active Controller is removed from the stack, and a new Active Controller is
elected, by default the MAC address of the new Active Controller becomes the MAC address for the
IronStack. When you enable the Persistent MAC Address feature, you configure a time delay before
the stack MAC address changes. During this configured interval, if the previous Active Controller is
reinstalled in the stack, the stack continues to use the MAC address of this unit, even though it may
no longer be the Active Controller. If the previous Active Controller does not rejoin the stack during
the specified time interval, the stack assumes the address of the new Active Controller as the stack
MAC address.
The Persistent MAC Address feature allows you to configure a period of time during which the
original base MAC address will not change if the Active Controller fails, or is removed for
maintenance. This timer is triggered when the Standby Controller becomes the Active Controller.
When the timer expires, the new Active Controller will change the previous MAC address to its base
MAC address and advertise this MAC address to management VLANs to update the ARP peer table.
If you want to use the new address, you will have to re-enter the stack-persistent-mac-timer
command again to reactivate the persistent MAC address,
To enable Persistent MAC Address, enter the following command.
Brocade(config)# stack persistent-mac-timer 120
Syntax: [no] stack persistent-mac-timer <number>
The <number> variable is the number of minutes during which the IronStack will retain the original
MAC Address if the Active Controller fails or is removed for service. The valid value range is from 5
through 6000 minutes. If you enter a 0, it means “keep this address forever”. The default is 60
minutes.
To disable Persistent MAC Address, enter the following command.
Brocade(config)# no stack persistent-mac-timer
NOTE
If you enter the no form of this command while the persistent MAC address timer is active, the stack
will disregard the persistent MAC address and will assume the MAC address of the new Active
Controller.
NOTE
Persistent MAC and stack MAC cannot be used together.
In the following example, the persistent MAC timer has been set to the default of 60 minutes.
Brocade(config)# stack persistent-mac 60
Brocade(config)# show running-config
Current configuration:
!
ver 05.0.011T7e1
!
stack 1
module 1 fcx-48-port-copper-base-module
module 2 fcx-cx4-1-port-10g-module
priority 80
stack 2