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Extreme Networks Virtual Chassis Specifications

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Extreme Networks Technical Brief
© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 1
Introduction
Extreme Networks
®
SummitStack™ stacking technology
enables the physical connection of up to eight individual
Summit
®
switches together as a single logical unit. This
logical unit reduces the management overhead of fixed
configuration switches by behaving as a single switch with a
single IP address and a single point of authentication. In
ExtremeXOS
®
, Extreme Networks edge-to-core modular
operating system, a stack is controlled by a master switch,
called the master. The master switch runs the full-featured
version of ExtremeXOS and is responsible for maintaining
all of the software tables for all the switches in the stack.
There can only be one master switch in a stack of switches.
All switches in the stack, including the master switch, are
called nodes.
A stack of Summit switches can be thought of as a Virtual
Chassis™. Each node acts as if it was occupying a slot in a
chassis and is controlled by the master. The high-speed
stacking links function like the backplane links of a chassis.
Stacking offers customers a flexible way to increase switch
density and capacity, provides port configuration choices, and
controls upfront capital requirements. SummitStack permits
mixing and matching Summit switches in a multi-platform
stack to provide the port configuration you need, from
Ethernet, Fast Ethernet, Gigabit Ethernet to 10 Gigabit
Ethernet, in copper, Power over Ethernet (PoE), Power over
Ethernet Plus (PoE-plus) and fiber optic interfaces.
The master switch stores any configuration information for
the stack in its primary and secondary flash memory. Since
the master switch has the knowledge of the state and the
configuration of all the other switches in the stack, it can
respond to all external requests for those switches. For
example, the master switch can respond to a request for
SNMP information from all ports within the stack.
SummitStack is supported through dedicated stacking port
functionality with specific stack cables or through the use of
existing 10 Gigabit Ethernet ports to stack the switches
together. The latter option allows for physical flexibility
when stacking needs to be carried over longer distances
than is supported in the dedicated stacking cables.
SummitStack is an Extreme Networks solution for fixed
configuration switches to provide simplified yet agile
operations for scalable converged networks. The mecha-
nism supports many network topology designs and is
Ethernet based requiring no new hardware or interfaces.
This technology brief introduces different varieties of
stacking and can help clarify areas of potential confusion.
Topics covered include: different topologies possible with
stacking, aspects of configuring and managing a stack, what
happens during stack topology changes, and how to
configure a stack for the first time.
SummitStack Varieties
The following table shows the different stacking options
available on Extreme Networks stacking products.
SummitStack
Stacking Technology
Stacking Options Speed per Link (HDX) Cable Type & Lengths Summit Switch Series
SummitStack 10 Gbps 0.5m, 1.5m, 3.0m
20Gbps Stacking Cable
Summit X250
Summit X450a
Summit X450e
Summit X460
Summit X480
Summit X650
SummitStack-V 10 Gbps 0.5m – 100m
SFP+, XFP, XENPAK, 10GBaseT
Summit X450a
Summit X450e
Summit X460
Summit X480
Summit X650
SummitStack-V80 20 Gbps 0.5m – 100m
QSFP+ only
Summit X460
SummitStack128 32 Gbps 0.5m, 1.0m, 3.0m Summit X480 with conversion
cable to SummitStack256
SummitStack256 64 Gbps 0.5m, 1.0m, 3.0m Summit X650
SummitStack512 128 Gbps 0.5m, 1.0m, 3.0m Summit X650
Table 1
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Summary of Contents

Page 1 - Stacking Technology

Extreme Networks Technical Brief© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 1Introduction Extreme Networ

Page 2 - SummitStack Topologies

Extreme Networks Technical Brief© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 2SummitStack Topologies Figu

Page 3 - Stack Depth

Extreme Networks Technical Brief© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 3Understanding SummitStack

Page 4

Extreme Networks Technical Brief© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 4topologies and will allow f

Page 5

Extreme Networks Technical Brief© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 5About Power Management and

Page 6 - About Easy Setup

Extreme Networks Technical Brief© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 6Extreme Networks Technical

Page 7

Extreme Networks Technical Brief© 2010 Extreme Networks, Inc. All rights reser ved. SummitStack Stacking Technology—Page 7Extreme Networks Technical

Page 8

Extreme Networks Technical BriefStack State – A state assigned by the stack to a node. This can be displayed using the command show stacking.Stack Top

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