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Stacking S-Series Switches | 1027
You may stack any combination of S-Series models that have the same FTOS version. Figure 50-8 shows
two common stacking topologies, ring and cascade (also called daisy-chain). A ring topology provides
some performance gains and stack integrity.
Figure 50-8. Common S-Series Stacking Topologies
Facing the rear of an S-Series unit, stack-port are numbered from left to right, beginning with the highest
Ethernet port number (n) plus 1. For example, for a 48-port unit with two 12-Gigabyte stacking modules,
the stack-ports are 49, 50, 51, and 52, starting from the left.
To add a unit to an existing stack:
Step Task Command Syntax Command Mode
1 Verify that each unit has the same FTOS version prior to
stacking them together.
show version
EXEC Privilege
2 Pre-configure unit numbers for each unit so that the
stacking is deterministic upon boot up.
stack-unit renumber
EXEC Privilege
3 Configure the switch priority for each unit to make
management unit selection deterministic.
stack-unit priority
CONFIGURATION
4 Connect the units using stacking cables.
5 Power the stack one unit at a time. Start with the
management unit, then the standby, followed by each of the
members in order of their assigned stack number (or the
position in the stack you want each unit to take). Allow each
unit to completely boot, and verify that the unit is detected
by the stack manager, and then power the next unit.
show system brief
EXEC Privilege
A
B
A
B
A
B
A
B
A
B
A
B
Ring Connection Cascade Connection
A
B
Stacking 0
01