Summit Switches - Stacking Over Ethernet

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I am trying to find some documentation which gives me information regarding stacking over ethernet but am having trouble. It would be very helpful if someone could point me in the right direction on how to do this, both setup and configuration.

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John Cook

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Posted 3 years ago

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Hello John,

i assume you are asking about Alternate stacking.

Selecting Native and Alternate Stack PortsOn switches that provide both native stack ports and alternate stack ports, you can configure each
logical stack port to use either the native stack port or the alternate stack port. You can configure
logical stack ports to use any of the following physical stack port configurations:

• Two native stack ports
• Two alternate stack ports
• One native stack port and on alternate stack port

For the switches with the VIM3-40G4X and VIM4-4, when an alternate stack port is selected, the
corresponding native stack port is automatically disabled and cannot be used.
When the Stacking Port Selection Control column in the following table displays Yes for a switch
configuration, you can choose between native and alternate ports.
The default selection is the native stack ports.\

• To select between the native and alternate stack ports, use the following command:
configure stacking-support stack-port [stack-ports | all] selection [native
{V80 | V160} | V320} | alternate]

• To display the stacking and stacking-support configuration, use the following command:
show stacking-support
show stacking stack-ports
show stacking {node-address node_address | slot slot_number} detail
• To unconfigure the stacking-support feature, use the following command:
unconfigure stacking-support

Please check concepts guide page 143 for more information.

Parthiban Chinnaya


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Please find the link to download 15.6 userguide.
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Hi John,

Information on how to use regular data ports for stacking can be found in the User Guide for your ExtremeXOS release under the keyword "SummitStack-V". It is on page 140 in the EXOS 15.6 User Guide for example. The guide also lists configuration examples.

See for download options.

Hope that helps,


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This Tabular column should help you with the Ports used for stacking in different exos switches.


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1.Upgrade the switches to same Exos version stacking ports and connect cables.
3.configure stacking 
4.use show stacking to verify stack is up.
show slot
show stacking configuration
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John Cook

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Thank you both, got all the information I need!
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shakil khan

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Hi Parthiban

are the alternate ports related to the summitstack-v feature for the x460 switch,, i wont be using any of the vim modules other than the summitstack-v feature can you explain this to me please

i am setting up a stack of 3 swithes from scratch


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Request you to refer page 129 in concepts guide.
If you still questions please reply.

Please find the information for X460

Before deploying a new stack with Summit X460 switches, consider the following guidelines:• In a stack that contains Summit X460 switches and other Summit switch models, a Summit X460
switch might provide more memory and more features than other Summit switch models, and this
affects master node selection, backup node selection, and failover operation. Before configuring a
stack with Summit X460 switches and other Summit switch models, review Configuring the Master,
Backup, and Standby Roles on page 149.

• To use the failover feature in the stack, a second Summit X460 is required, and it must be the
backup node.
• Beginning with ExtremeXOS Release 12.5.1, only the master and master-capable nodes require a
license to support special features such as MPLS.
• If the MPLS feature pack is installed on the master capable nodes, the following guidelines apply:
• Each stack switch must meet the software and hardware requirements listed in Feature License
• You must configure the enhanced stacking protocol on each Summit family switch.
• Although you can mix Summit X460, X480, X670, and X770 switches in a stack, we recommend
that you do not mix these switch types if the desired routing table exceeds the supported limit
for the Summit X460 switch, which is 12,256 IPv4 LPM routes.
• Summit X460 switches support multiple types of stacking cables for connection between Summit
X460 compatible SummitStack option cards and other Summit switches. For information on which
cables to use with each type of Summit family switch, see the Summit Family Switches Hardware
Installation Guide.

To avoid an additional stack reboot, we recommend that you configure the following stack relatedfeatures before invoking easy setup:
• Stacking license restriction
• SummitStack-V-----------------------------------this was ur requirement
• VIM3-40G4X port configuration
• VIM4-40G4X port configuration
• Enhanced protocol for MPLS support on a stack
The configuration procedure described in the next section starts Easy Setup. You can also start it by
entering the configure stacking easy-setup command.
Easy Setup performs the functions of the following commands required to configure and activate a ring
topology stack:
enable stacking
configure stacking slot-number automatic
configure stacking mac-address
configure stacking redundancy minimal
configure stacking protocol
reboot stack-topology
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shakil khan

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hi you mention that i need to configure this SummitStack-V--- what configuration is needed?


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Using Ethernet Ports for Stacking (SummitStack-V)The SummitStack-V feature allows you to use Ethernet ports that run at least 10 Gbps as stacking ports.
This feature allows you to overcome the length limit on the custom stacking cables used with dedicated
or native stack ports. For example, Summit family switches on different floors in a building or in
different buildings on a campus can be connected to form a stack using standard Ethernet cables.
The SummitStack-V feature also allows you to stack switches that have no native stacking ports but do
have at least two Ethernet ports, which can be configured to support either data communications or
the stacking protocol. When these dual-purpose ports are configured to support stacking, they are
called alternate stack ports to distinguish them from the native stack ports that use custom cables.
Alternate stack ports use the ExtremeXOS proprietary stacking protocol, not the standard Ethernet
protocol. This means that the alternate stack ports between two stack switches must be directly
connected, with no intervening switch connections.
Summit family switches that support alternate stack ports have two logical stack ports: Stack Port 1 and
Stack Port 2.
Each logical stack port is mapped to one physical data port that operates as an alternate stack port
when the stacking protocol is enabled with the stacking-support option.
When the stacking-support option is enabled, data communications stops on the physical data ports
listed in Support for Alternative Stack Ports on page 140. When stacking is enabled (with the enable
stacking command), the stacking protocol for logical stack ports 1 and 2 operates on the physical
data ports listed in this table.

You need to enable the below command

Enabling and Disabling the Stacking-Support OptionThe stacking-support option is automatically enabled for many Summit switch and option card
configurations. However, some Summit switch and option card configurations require you to enable the
stacking-support option before a switch can participate in a stack. The preceding table indicates which
switch and option cards require you to enable the stacking-support option. If the Stacking-Support
Option Control column in this table displays Yes, the stacking-support option must be enabled before

the switch can join a stack.
• Enable the stacking-support option using:
enable stacking-support-----------------------------------------use this command

• Configure the switch data ports to use the Ethernet protocol instead of the stacking protocol using:
disable stacking-support