Reference Guide

856 | Stacking
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Figure 48-3. S5000 Stack Manager Redundancy
Stack Unit and Stack Group Numbering
On an S5000 switch, you enable ports for stacking by specifying a stack-unit number and stack-group
number (
stack-unit number stack-group number).
Stack-unit numbers: By default, each S5000 switch in standalone mode is numbered stack-unit 0.
Stack-unit numbers are assigned to member switches when a stack comes up. To pre-configure the units
which will be the master and standby when the stack boots up, you can assign unit numbers with the
stack-unit renumber command.
Stack-group numbers: On the S5000, stacking ports are divided into 16 stack-groups (0 to 15) as shown
in Figure 48-4. Each set of four 10GbE ports on an Ethernet module or each fixed 40GbE port on the front
panel correspond to a stack group. Each stack group has 40G of bandwidth.
Stack#show redundancy
-- Stack-unit Status --
------------------------------------------------
Mgmt ID: 0
Stack-unit ID: 1
Stack-unit Redundancy Role: Primary
Stack-unit State: Active
Stack-unit SW Version: 9.1(1.0)
Link to Peer: Up
-- PEER Stack-unit Status --
------------------------------------------------
Stack-unit State: Standby
Peer stack-unit ID: 2
Stack-unit SW Version: 9.1(1.0)
-- Stack-unit Redundancy Configuration --
------------------------------------------------
Primary Stack-unit: mgmt-id 0
Auto Data Sync: Full
Failover Type: Hot Failover
Auto reboot Stack-unit: Enabled
Auto failover limit: 3 times in 60 minutes
-- Stack-unit Failover Record --
------------------------------------------------
Failover Count: 0
Last failover timestamp: None
Last failover Reason: None
Last failover type: None
--Last Data Block Sync Record: --
------------------------------------------------
Stack Unit Config: succeeded Mar 24 2013 20:35:14
Start-up Config: failed Mar 24 2013:35:14
Runtime Event Log: succeeded Mar 24 2013 20:35:14
Running Config: succeeded Mar 24 2013 20:35:14
ACL Mgr: succeeded Mar 24 2012 20:35:14
LACP: no block sync done
STP: no block sync done
SPAN: no block sync done