Users Guide
• MAC address (if there is a priority tie) — By default, the unit with the highest MAC value becomes the
master unit if no priorities are configured.
A change in the stack master occurs when:
• You power down the stack master.
• A failover of the master switch occurs.
• You disconnect the master switch from the stack.
NOTE: If a stack unit does not boot up at the same time as the other units, it does not participate in
the election process. Units that boot up late do not participate in the election process because the
master and standby have already been elected. The unit that boots up late (even if they have a
higher priority configured) joins as a member.
To display the PE stack master, enter the show pe pe—id system brief command.
The following example shows output from an established stack.
Example of Displaying Stack Members
Dell#show pe 0 system brief
Stack MAC: a0:68:00:3f:92:bc
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
---------------------------------------------------------------------------
0 Management online C1048P C1048P 1-0(0-4879) 52
1 Member online C1048P C1048P 1-0(0-4879) 52
2 Standby online C1048P C1048P 1-0(0-4879) 52
3 Member online C1048P C1048P 1-0(0-4879) 52
4 Member online C1048P C1048P 1-0(0-4879) 52
5 Member online C1048P C1048P 1-0(0-4879) 52
6 Member online C1048P C1048P 1-0(0-4879) 52
7 Member online C1048P C1048P 1-0(0-4879) 52
Important Points to Remember
• You can stack up to eight C1048P port extenders.
• You cannot stack C1048P port extenders with other system types.
• Set up a C1048P stack by using the dedicated stacking ports on the back panel. Dell Networking
recommends using a ring topology for a PE stack.
• All stack units must have the same version of Dell Networking OS.
• When you restore the factory-default settings on all units in a stack, the units are placed in standalone
mode.
• Dell Networking recommends connecting more than one C1048P stack unit to the C9010 for
redundancy. (Individual C1048P stack members do not require a separate uplink to a parent C9010
because they use the stacking connection to the master PE for their C9010 uplink.)
PE Stack Configuration
You can perform the following configuration tasks for PE stacking.
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Port Extender (PE) Stacking