Mac Addressing On S-Series Stacks - Dell Force10 C150 Configuration Manual

Figure 50-2. Electing the Stack Manager
Stack>show system brief
Stack MAC : 00:01:e8:d5:f9:6f
-- Stack Info --
Unit UnitType Status
---------------------------------------------------------------------------
0 Standby online
1 Management online
2 Member online
3 Member not present
4 Member not present
5 Member not present
6 Member not present
7 Member not present
Stack#show system stack-unit 0 | grep priority
Master priority : 0
Stack#show system stack-unit 1 | grep priority
Master priority : 0
Stack#show system stack-unit 2 | grep priority
Master priority : 0
Stack#show system stack-unit 0| grep "Burned In MAC"
Burned In MAC : 00:01:e8:d5:ef:81
Stack#show system stack-unit 0 | grep "Burned In MAC"
Burned In MAC : 00:01:e8:d5:ef:81
Stack#show system stack-unit 1 | grep "Burned In MAC"
Burned In MAC : 00:01:e8:d5:f9:6f
Stack#show system stack-unit 2 | grep "Burned In MAC"
Burned In MAC : 00:01:e8:cc:cc:cc

MAC Addressing on S-Series Stacks

The S-Series has three MAC addressees: the chassis MAC, interface MAC, and null interface MAC. All
interfaces in the stack use the interface MAC address of the management unit (stack manager), 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 manager.
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.
In Figure 50-3 and Figure
the same priority, but the standalone has a lower MAC address, so the standalone reboots. In
and Figure 50-5, a standalone is added to a stack. The standalone has a higher priority than the stack, so the
stack (excluding the new unit) reloads.
ReqTyp
S50V
S50N
S50V
50-4, a standalone is added to a stack. The standalone and the stack master have
CurTyp Version
S50V 7.8.1.0
S50N 7.8.1.0
S50V 7.8.1.0
Ports
52
52
52
Figure 50-4
Stacking S-Series Switches | 1021