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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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MAC Addressing on Stacks

The stack has three MAC addresses: the chassis MAC, interface MAC, and null interface MAC.

All interfaces in the stack use the interface MAC address of the management unit, and the chassis MAC for the stack is the master’s chassis MAC. The stack continues to use the master’s chassis MAC address even after a failover. The MAC address is not refreshed until the stack is reloaded and a different unit becomes the stack master.
NOTE If the removed management unit is brought up as a standalone unit or as part of a different stack, there is a possibility of MAC address collisions.

A standalone is added to a stack. The standalone and the master unit have the same priority, but the standalone has a lower MAC address, so the standalone reboots. In the second example, a standalone is added to a stack. The standalone has a higher priority than the stack, so the stack (excluding the new unit) reloads.

Example of Adding a Standalone with a Lower MAC Address to a Stack

----------STANDALONE BEFORE CONNECTION---------------
Standalone#show system brief

Stack MAC                  : f8:b1:56:29:fc:21
Reload-Type                : normal-reload [Next boot : normal-reload]

--  Stack Info  --
Unit  UnitType     Status         ReqTyp          CurTyp          Version     Ports
----------------------------------------------------------------------------------
  1   Member       not present   
  2   Member       not present   
  3   Member       not present   
  4   Management   online         S3148P           S3148P          1-0(0-4679)  54
  5   Member       not present   
  6   Member       not present   
  7   Member       not present   
  8   Member       not present   
  9   Member       not present   
 10   Member       not present   
 11   Member       not present   
 12   Member       not present   
--  Module Info  --
Unit  Module No   Status        Module Type                  Ports
---------------------------------------------------------------------------
  4   1           not present   No Module                     0  

--  Power Supplies  --
Unit   Bay   Status       Type    FanStatus   FanSpeed(rpm)
---------------------------------------------------------------------------
  4     1    up           AC      up          7824
  4     2    absent               absent      0
        
--  Fan  Status  --
Unit Bay   TrayStatus  Fan0    Speed   Fan1    Speed   
------------------------------------------------------------------------------------
 4    1     up          up      7058    up      6956    
        
Speed in RPM


Standalone#show system | grep priority
Master priority : 0

-----------STACK BEFORE CONNECTION----------------

Dell#show system brief

Stack MAC                  : f8:b1:56:29:fc:2b
Reload-Type                : normal-reload [Next boot : normal-reload]

--  Stack Info  --
Unit  UnitType     Status         ReqTyp          CurTyp          Version     Ports
------------------------------------------------------------------------------------
  1   Standby      online         S3124F           S3124F          1-0(0-4679)  30
  2   Management   online         S3148P           S3148P          1-0(0-4679)  54
  3   Member       not present    
  4   Member       not present    
  5   Member       not present    
  6   Member       not present    
  7   Member       not present    
  8   Member       not present    
  9   Member       not present    
 10   Member       not present    
 11   Member       not present    
 12   Member       not present    
 
--  Module Info  --
Unit  Module No   Status        Module Type                  Ports
---------------------------------------------------------------------------
  1   1           not present   No Module                     0  
  2   1           not present   No Module                     0  
        
--  Power Supplies  --
Unit   Bay   Status       Type    FanStatus   FanSpeed(rpm)
---------------------------------------------------------------------------
  1     1    down         UNKNOWN down        0
  1     2    up           AC      up          7728
  2     1    absent               absent      0
  2     2    up           AC      up          8032
        
--  Fan  Status  --
Unit Bay   TrayStatus  Fan0    Speed   Fan1    Speed   
------------------------------------------------------------------------------------
 1    1     up          up      6666    up      7058    
 2    1     up          up      7164    up      7058    
        
Speed in RPM
        
Dell#00:01:59: %STKUNIT1-S:CP %RAM-5-STACKUNIT_STATE: Stack-unit 1 is in Standby State.
Dell#show system stack-unit 1 | grep priority
Master priority            : 0 
Dell#show system stack-unit 4 | grep priority
Master priority            : 0 
Dell#
              

Example of Adding a Standalone with a Lower MAC Address and Equal Priority to a Stack

---------------STANDALONE AFTER CONNECTION-----------------

00:21:51: %STKUNIT4-M:CP %POLLMGR-2-ALT_STACKUNIT_STATE: Alternate stack-unit is present
00:21:51: %STKUNIT4-M:CP %CHMGR-5-STACKUNIT_DETECTED: stack-unit 1 present
00:21:51: %STKUNIT4-M:CP %CHMGR-5-STACKUNIT_DETECTED: stack-unit 2 present

---------------STACK AFTER CONNECTION---------------------

Dell#00:03:36: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 2/54
00:03:42: %S3148P:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/53
00:03:53: %STKUNIT2-M:CP %CHMGR-5-STACKUNIT_DETECTED: stack-unit 4 present
00:03:55: %S3148P:1 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 1/53
00:03:55: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 2/54
00:03:55: %STKUNIT2-M:CP %CHMGR-2-STACKUNIT_DOWN: stack-unit 4 down - card removed

00:06:48: %S3148P:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/53
00:06:48: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 2/54
00:06:58: %STKUNIT2-M:CP %CHMGR-5-STACKUNIT_DETECTED: stack-unit 4 present
00:07:01: %STKUNIT2-M:CP %CHMGR-5-CHECKIN: Checkin from stack-unit 4 (type S3148P, 54 ports)
00:07:02: %STKUNIT2-M:CP %CHMGR-5-STACKUNIT_UP: stack-unit 4 is up

Dell#show system brief

Stack MAC                  : f8:b1:56:29:fc:2b
Reload-Type                : normal-reload [Next boot : normal-reload]

--  Stack Info  --
Unit  UnitType     Status         ReqTyp          CurTyp          Version     Ports
------------------------------------------------------------------------------------
  --  Stack Info  --
Unit  UnitType     Status         ReqTyp          CurTyp          Version     Ports
------------------------------------------------------------------------------------
  1   Standby      online         S3124F           S3124F          1-0(0-4679)  30
  2   Management   online         S3148P           S3148P          1-0(0-4679)  54
  3   Member       not present    
  4   Member       online         S3148P           S3148P          1-0(0-4679)  54
  5   Member       not present    
  6   Member       not present    
  7   Member       not present    
  8   Member       not present    
  9   Member       not present    
 10   Member       not present    
 11   Member       not present    
 12   Member       not present    
 
--  Module Info  --
Unit  Module No   Status        Module Type                  Ports
---------------------------------------------------------------------------
  1   1           not present   No Module                     0  
  2   1           not present   No Module                     0  
  4   1           not present   No Module                     0  
        
--  Power Supplies  --
Unit   Bay   Status       Type    FanStatus   FanSpeed(rpm)
---------------------------------------------------------------------------
  1     1    down         UNKNOWN down        0
  1     2    up           AC      up          7728
  2     1    absent               absent      0
  2     2    up           AC      up          8032
  4     1    up           AC      up          7824
  4     2    absent               absent      0
        
--  Fan  Status  --
Unit Bay   TrayStatus  Fan0    Speed   Fan1    Speed   
------------------------------------------------------------------------------------
 1    1     up          up      7058    up      7058    
 2    1     up          up      7164    up      7058    
 4    1     up          up      7058    up      7058    
        
Speed in RPM
Dell#

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