Skip to main content
Sign Out

Welcome to Dell

My Account
  • Place orders quickly and easily
  • View orders and track your shipping status
  • Create and access a list of your products
  • Manage your Dell EMC sites, products, and product-level contacts using Company Administration.
Sign In Create an Account Premier Sign In Partner Program Sign In
Contact Us

Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

PDF

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 : 00:01:e8:d5:ef:81

-- Stack Info --
Unit UnitType    Status      ReqTyp CurTyp Version Ports
------------------------------------------------------
0   Management  online      
S4048-ON    S4048-ON   
1   Member      not present
2   Member      not present
3   Member      not present
4   Member      not present
5   Member      not present
6   Member      not present
[output omitted]
Standalone#show system | grep priority
Master priority : 0
-----------STACK BEFORE CONNECTION----------------
Stack#show system brief

Stack MAC : 00:01:e8:d5:f9:6f

-- Stack Info --
Unit UnitType    Status       ReqTyp CurTyp Version  Ports
---------------------------------------------------
0    Standby     online       S4048-ON 
1    Management  online       S4048-ON 
2    Member      not present
3    Member      not present
4    Member      not present
5    Member      not present
6    Member      not present
7 Member not present
[output omitted]
Stack#show system stack-unit 1 | grep priority
Master priority : 0
Stack#show system stack-unit 2 | grep priority
Master priority : 0

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

Rate this content

Accurate
Useful
Easy to understand
Was this article helpful?
0/3000 characters
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please select whether the article was helpful or not.
  Comments cannot contain these special characters: <>()\