Reference Guide

962 | Stacking S-Series Switches
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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:
To display the status of the stacking ports, including the topology:
The first example below shows a daisy-chain topology. The second example shows the same stack
converted to a ring by connecting stack-port 2/51 to 0/51; you may rearrange the stacking cables without
triggering a unit reset, so long as the stack manager is never disconnected from the stack.
Displaying the S-Series Stacking Topology
Stack#show system stack-ports
Topology: Daisy chain
Interface Connection Link Speed Admin Link Trunk
(Gb/s) Status Status Group
------------------------------------------------------------------
0/51 12 up down
0/52 1/50 12 up up
1/49 2/52 12 up up
1/50 0/52 12 up up
2/51 12 up down
2/52 1/49 12 up up
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
Task Command Syntax Command Mode
Display the stacking ports. show system stack-ports EXEC Privilege