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SummitStack Topologies
Consider these differences when selecting a primary node, selecting a backup node, and configuring
failover operation.
Important
The 5720 series switches can be stacked with themselves using Native V400 stacking
(SummitStack-V400) or with the 5520 series switches using Native V200 stacking
(SummitStack-V200). Assign the primary and backup roles to switches from the same series.
For example, if the primary node is a 5720 series switch, the backup node must also be a
5720 series switch. The 5520 series switches must only be used as standby nodes when they
are in a mixed stack with 5720 Series switches. Similarly, if the primary node is an 5520 series
switch, the backup node must also be an 5520 series switch.
When easy setup compares two switches that have the same capability, the lower slot number takes
precedence.
Follow the same ranking hierarchy when you plan the physical placement of the switches in the stack.
SummitStack Topologies
Figure 18
presents a graphical representation of a stack and some of the terms that describe stack
conditions.
Figure 18: Example of a Stack, Showing the Active Topology and the Stack Topology
A stack is the collection of all switches, or nodes, that are cabled together to form one virtual switch
using the Switch Engine SummitStack feature.
The maximum cable length supported between switches depends on the types of switches in your
stack, the installed option cards, and the configured stacking ports. For more information, see
Create Your Stack
42
ExtremeSwitching 5720 Series Hardware Installation Guide
on page 47.
Build Stacks
Plan to
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