Users Guide

Setting the priority will determine which switch will become the management (Master) switch. The
switch with the highest priority number is elected Master. The default priority is 0.
NOTE: It is best practice to assign priority values to all switches before stacking them in order
to acquire and retain complete control over each units role in the stack.
2. Configure the stack-group for each stack-unit.
CONFIGURATION mode
stack-unit unit-no stack-group stack-group-id
Dell(conf)# stack-unit 0 stack-group 0
Dell (conf)#02:26:05: %STKUNIT0-M:CP %IFMGR-6-STACK_PORTS_ADDED:
Ports Fo 0/33 have been configured as stacking ports.
Please save and reload for config to take effect
Stack-groups are easier to think of simply as stack ports. For example, using the stack-group 0
command simply turns the lower port (port 9) into a stacking port. Similarly, stack-group 1,
stack-group 2 and stack-group 3 commands correspond to ports 10, 11 and 12 respectively.
NOTE: Stack-group is supported only in PMUX mode.
3. Continue to run the stack-unit 0 stack-group <0-3> command to add additional stack ports
to the switch, using the stack-group mapping.
Cabling Stacked Switches
Before you configure MXL switches in a stack, connect the 40G direct attach or QSFP cables and
transceivers to connect 40GbE ports on two Aggregators in the same or different chassis.
Cabling Restrictions
The following restrictions apply when setting up a stack of Aggregators:
• Only daisy-chain or ring topologies are supported; star and full mesh topologies are not supported.
• Stacking is supported only on 40GbE links by connecting 40GbE ports on the base module. Stacking
is not supported on 10GbE ports or 4x10GbE ports.
• Use only QSFP transceivers and QSFP or direct attach cables (purchased separately) to connect
stacking ports.
Cabling Redundancy
Connect the units in a stack with two or more stacking cables to avoid a stacking port or cable failure.
Removing one of the stacked cables between two stacked units does not trigger a reset.
Cabling Procedure
The following cabling procedure uses the stacking topology shown earlier in this chapter.
To connect the cabling:
1. Connect a 40GbE base port on the first Aggregator to a 40GbE base port on another Aggregator in
the same chassis.
232
Stacking