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Extreme Networks Technical Brief: SummitStack, Extreme Networks Virtual Chassis Stacking Technology

True Stacking

“True stacking” provides the capability for multiple

stackable switches to behave as one Virtual Chassis.

With true stacking technology, IT administrators

beneﬁt from consolidating the management instances

for, typically, up to eight Ethernet switches, and also

beneﬁt from consolidating the switch forwarding

data plane so that the stacked system behaves with

the simplicity of a modular chassis system. Using true

stacking, the switching system, including switching

fabric, is consolidated so that all resources are centrally

manageable. IT administrators may create VLANs,

Link Aggregation Groups (LAGs), Access Control

Lists (ACLs), plus port mirroring across ports in

dierent switches within a stack. For true stacking,

the connectivity is typically via specialized high-speed

interfaces rather than standard Ethernet links. This

allows the use of non-Ethernet-based protocols to

provide multi-path connectivity and redundancy

within a stack. Unlike other stacking solutions,

SummitStack provides distributed forwarding which

enable each switch within the virtual chassis to

perform “local switching.”

True Stacking vs. Single IP Management

“Stacking” is sometimes used to describe the

ability to manage multiple switches via a single IP

address. This single IP management can simplify

management via consolidation, allowing a number

of devices to be managed via a single representative

switch. This feature helps IP administrators reduce

complexity. Although this capability allows having

one management instance, typically single IP

management would not provide a method to conﬁgure

data forwarding-related parameters across multiple

switches simultaneously. For example, if you would

like to conﬁgure VLANs that span multiple switches

in the same management domain, you would need to

conﬁgure them one-by-one, a time consuming task. For

single IP management, the connectivity is typically via

regular Ethernet technologies, such as Fast Ethernet,

Gigabit Ethernet and 10 Gigabit Ethernet, hence the

network connectivity and redundancy are based on the

IEEE 802.1D Ethernet MAC bridging standard, which

includes bridging and spanning tree protocol.

The table below summarizes the comparison between single IP management and true stacking.

Attribute Single IP Management True Stacking

One Management IP Address YES YES

VLAN Conﬁguration Within a single switch Across all switches in stack

Switch Forwarding Typically Layer-2 Switching Only Layer-2 or Layer-3 Switching

Port Mirroring Within a single switch Across all switches in stack

Link Aggregation Within a single switch Across all switches in stack

Stacking Link Typically Native Ethernet Proprietary interface or Ethernet

Table 3: Comparison between Single IP Management and True Stacking

1 2 3 4 5 6 7

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