White Papers

12 1 up AC up NA
12 2 down UNKNOWN absent NA
-- Fan Status --
Unit Bay TrayStatus Fan1 Speed Fan2 Speed
------------------------------------------------------------------------------------
1 1 up up 7164 up 7058
2 1 up up 6956 up 7058
3 1 up up 7164 up 7058
4 1 up up 7058 up 7164
5 1 up up 7058 up 6956
6 1 up up 7058 up 7164
7 1 up up 12307 down 0
8 1 up up 7164 up 7164
9 1 up up 7058 up 7058
10 1 up up 7164 up 7058
11 1 up up 7058 up 7058
12 1 up up 7164 up 7058
Speed in RPM
DellEMC#
Virtual IP
You can manage the stack using a single IP, known as a virtual IP, that is retained in the stack even after a failover.
The virtual IP address is used to log in to the current master unit of the stack. Both IPv4 and IPv6 addresses are supported as virtual IPs.
Use the following command to congure a virtual IP: Dell(conf)#virtual-ip {ip-address | ipv6–address | dhcp}
Failover Roles
If the stack master fails (for example, is powered o), it is removed from the stack topology.
The standby unit detects the loss of peering communication and takes ownership of the stack management, switching from the standby
role to the master role. The distributed forwarding tables are retained during the failover, as is the stack MAC address. The lack of a
standby unit triggers an election within the remaining units for a standby role.
After the former master switch recovers, despite having a higher priority or MAC address, it does not recover its master role but instead
takes the next available role.
To view failover details, use the show redundancy command.
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 dierent unit becomes the stack master.
NOTE
: If the removed management unit is brought up as a standalone unit or as part of a dierent 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.
Stacking
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