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. 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.
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