Users Guide

218 Stacking
• The switch Control Plane is active only on the master. The Control Plane
is a software layer that manages system and hardware configuration and
runs the network control protocols to set system configuration and state.
• The switch Data Plane is active on all units in the stack, including the
master. The Data Plane is the set of hardware components that forward
data packets without intervention from a control CPU.
• The running configuration is propagated to all units and the application
state is synchronized between the master and standby during normal
stacking operation. The startup configuration and backup configuration
on the stack members are not overwritten with the master switch
configuration.
Dell strongly recommends connecting the stack in a ring topology so that
each switch is connected to two other switches. Connecting switches in a ring
topology allows the stack to utilize the redundant communication path to
each switch. If a switch in a ring topology fails, the stack can automatically
establish a new communications path to the other switches. Switches not
stacked in a ring topology may split into multiple independent stacks upon
the failure of a single switch or stacking link.
Additional stacking connections can be made between adjacent switch units
to increase the stacking bandwidth, provided that all redundant stacking links
have the same bandwidth. It is strongly recommended that the stacking
bandwidth be kept equal across of all stacking connections; that is, avoid
mixing single and double stacking connections within a stack. Up to eight
redundant stacking links can be configured on a stacking unit (four in each
direction).
Figure 8-1 shows a stack with three switches as stack members connected in a
ring topology.