Stacking Deployment Introduction
This section provides guidance for constructing a new stack, adding new members, replacing members, or adding new links within a stack. These tasks can be performed in several different ways. This section describes the most common methods. Other methods are discussed in more detail elsewhere in the guide.
Note: Adding new units or new links without
spanning tree protocols (STP) may create loops. Loops cause high traffic in the affected
ports and may cause high CPU usage if the looped packets are trapped to the CPU. As
a
result, failure to enable STP in a stack may have significant impact on traffic in
a
production environment. STP is enabled by default in switch images. Starting from
FastIron
release 09.0.00, STP is also enabled by default in router images.