(Rapid) Spanning Tree
7966_en_04
PHOENIX CONTACT
5-3
Figure 5-2
“(R)STP Configuration” web page
Large Tree Support
If RSTP is operated using the default values, it is suitable for up to seven switches along the
relevant path (see Figure 5-15 on page 5-23 and Figure 5-16 on page 5-24 as an example
for the relevant path). The RSTP protocol would therefore be possible in a ring topology for
up to 15 switches.
The “Large Tree Support” option makes the ring topology suitable for 28 switches along the
relevant path if RSTP is used. The “Large Tree Support” option could provide an RSTP ring
topology with up to 57 devices. When using large tree support, please note the following:
–
In the large tree support RSTP topology, do
not
use devices that do
not
support large
tree support.
–
Enable the “Large Tree Support” option on
all
devices.
–
If RSTP is to be activated as the redundancy mechanism in an existing network with
more than seven switches along the relevant path, then the “Large Tree Support” option
must first be enabled on all devices.
–
It is recommended that large tree support is not activated in networks with less than
seven switches along the relevant path.