DELL N3000 Manual Do Utilizador

Managing a Switch Stack

You can preconfigure information about a stack member and its ports before 

you add it to the stack. The preconfiguration takes place on the stack master. 

If there is saved configuration information on the stack master for the newly 

added unit, the stack master applies the configuration to the new unit; 

otherwise, the stack master applies the default configuration to the new unit. 

Prior to removing a member from a stack, check that other members of the 

stack will not become isolated from the stack due to the removal. Check the 

stack-port error counters to ensure that a stack configured in a ring topology 

can establish a communication path around the member to be removed.
The main point to remember when you remove a unit from the stack is to 

disconnect all the links on the stack member to be removed. Also, be sure to 

take the following actions:

• Remove all the STP participating ports and wait to stabilize the STP.
• Remove all the member ports of any Port-Channels (LAGs) so there will 

not be any control traffic destined to those ports connected to this member.

• Statically re-route any traffic going through this unit.

When a unit in the stack fails, the stack master removes the failed unit from 

the stack. The failed unit reboots with its original running-config. If the stack 

is configured in a ring topology, then the stack automatically routes around 

the failed unit. If the stack is not configured in a ring topology, then the stack 

may split, and the isolated members will reboot and re-elect a new stack 

master. No changes or configuration are applied to the other stack members; 

however, the dynamic protocols will try to reconverge as the topology could 

change because of the failed unit.
If you remove a unit and plan to renumber the stack, issue a no member 

unit 

command in Stack Configuration mode to delete the removed switch from 

the configured stack member information.

When you add a new switch to a stack, the Stack Firmware Synchronization 

feature automatically synchronizes the firmware version with the version 

running on the stack master per the configuration on the master switch. The 

synchronization operation may result in either upgrade or downgrade of 

firmware on the mismatched stack member.