DELL N3000 User Manual

Managing a Switch Stack

two fixed stacking ports in the rear of the switch. Stacking on Ethernet ports 

is not supported. The fixed stacking ports show as TwentygigabitStacking and 

are abbreviated Tw. 
NSF is enabled by default. You can disable NSF to redirect the CPU resources 

consumed by data checkpointing. Checkpointing only occurs when a backup 

unit is elected, so there is no need to disable the NSF feature on a standalone 

switch. When a new unit is added to the stack, the new unit takes the 

configuration of the stack, including the NSF setting. OSPF implements a 

separate graceful restart control that enables NSF for OSPF. OSPF graceful 

restart is not enabled by default.