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Stacking
An Aggregator auto-congures to operate in standalone mode. To use an Aggregator in a stack, you must manually congure it using
the CLI to operate in stacking mode.
Stacking is supported on the FN410S and FN410T Aggregators with ports 9 and 10 as the stack ports. The Aggregator supports
both ring and daisy-chain topology and stacking of the same type. FN 410S and FN 410T Aggregators support two-unit in-chassis
stacking and up to six units stacking across the chassis.
In Stack mode, the lower two external Ethernet ports (ports 9 and 10) operate as stack links. In Programmable MUX (PMUX) mode,
you can congure any of the external Ethernet ports to operate as stack links.
Stacking provides a single point of management for high availability and higher throughput. To congure a stack, you must use the
CLI.
Supported Modes
Stacking, PMUX
Conguring a Switch Stack
To congure and bring up a switch stack, follow these steps:
1. Connect the ports on the base module of two Aggregators using 10G direct attach or SFP+ bre cables.
2. Congure each Aggregator to operate in stacking mode.
3. Reload each Aggregator, one after the other in quick succession.
Stacking Prerequisites
Before you cable and congure a stack of the Aggregators, review the following prerequisites.
• All Aggregators in the stack must be powered up with the initial or startup conguration before you attach the cables.
• All stacked Aggregators must run the same Dell Networking OS version. To check the version that a switch is running, use the
show version command. To download a Dell Networking OS version, go to http://support.dell.com.
• Stacking is supported only with other Aggregators. A maximum of six Aggregators are supported in a single stack.
• A maximum of four stack groups is supported on a stacked Aggregator.
• Interconnect the stack units by following the instructions in Cabling the Switch Stack.
• You cannot stack a Standalone IOA and a PMUX.
Master Selection Criteria
A Master is elected or re-elected based on the following considerations, in order:
1. The switch with the highest priority at boot time.
2. The switch with the highest MAC address at boot time.
3. A unit is selected as Standby by the administrator, and a fail over action is manually initiated or occurs due to a Master unit
failure.
Stacking
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