Manually Allocating the Stack MAC Address

When a stack is enabled, “hitless-failover enable” configuration is added, and a default stack MAC address is assigned if none is configured. The address assigned is the MAC address of the unit as shown in the output of the show stack command.

The MAC address is a hexadecimal number in the format xxxx.xxxx.xxxx.

If necessary, you can manually configure the stack to use a specific MAC address.

Note: The stack mac command may be useful for administrative purposes; however, it should be used with caution to prevent duplication of MAC addresses.

To configure a stack MAC address manually, enter the following command in device configuration mode. 

device# configure terminal
device(config)# stack mac d4c1.9e18.3731

Note: Enter the no form of the stack mac command to revert to the use of the active controllers' MAC address.

The following example shows the stack MAC address being configured manually as confirmed in the show running-config command output. 

ICX7850-32Q Router# configure terminal
ICX7850-32Q Router(config)# stack mac d4c1.9e18.3731

ICX7850-32Q Router# show running-config
Current configuration:
!
ver 09.0.00
!
stack unit 1
  module 1 icx7850-32q-port-management-module
  module 2 icx7800-100g-12port-1200g-module
  module 3 icx7800-100g-8port-800g-module
  stack-trunk ethernet 1/3/1 to 1/3/4
  stack-trunk ethernet 1/3/5 to 1/3/8
stack unit 2
  module 1 icx7850-48fs-port-management-module
  module 2 icx7800-100g-8port-800g-module
  stack-trunk ethernet 2/2/1 to 2/2/4
  stack-trunk ethernet 2/2/5 to 2/2/8
stack enable
stack mac d4c1.9e18.3731
!

To display the stack MAC address (the Management MAC address, the MAC address of the first port of the active controller), enter the show chassis command. 

ICX7650-48P Router# show chassis
The stack unit 1 chassis info:

Power supply 1 not present
Power supply 2 (AC - PoE) present, status ok
        Model Number:   23-0000142-02
        Serial Number:  BLD2M39NM74
        Firmware Ver:   32.67
Power supply 2 Fan Air Flow Direction:  Front to Back

Fan 1 ok, speed (auto): [[1]]<->2
Fan 2 ok, speed (auto): [[1]]<->2

Fan controlled temperature: 35.3 deg-C

Fan speed switching temperature thresholds:
                Speed 1: NM<----->54       deg-C
                Speed 2:       46<-----> 70 deg-C (shutdown)

Fan 1 Air Flow Direction:  Front to Back
Fan 2 Air Flow Direction:  Front to Back
Slot 1 Current Temperature: 32.3 deg-C (Sensor 1), 41.6 deg-C (Sensor 2), 35.5 deg-C (Sensor 3), 36.0 deg-C (Sensor 4), 35.5 deg-C (Sensor 5), 41.1 deg-C (Sensor 6), 54.5 deg-C (Sensor 7), 37.0 deg-C (Sensor 8)
Slot 2 Current Temperature: Empty / Powered Down
Slot 3 Current Temperature: NA
        Warning level.......: 65.0 deg-C
        Shutdown level......: 70.0 deg-C
Boot Prom MAC : d4c1.9e14.6905
Management MAC: d4c1.9e14.6905
Note: For field descriptions of the show chassis command, refer to Displaying stack chassis information.
Parent topic: Stack Management MAC Address