FL NAT SMN 8TX(-M)
5-16
PHOENIX CONTACT
7966_en_04
–
Rule 2: At least one active Spanning Tree component per loop
An active Spanning Tree component supports the Spanning Tree protocol,
sends/receives and evaluates BPDUs, and sets its ports to the relevant STP states.
Each loop in a network must have at least one active Spanning Tree component to
disintegrate the loop.
Example:
Figure 5-11
Example topology
The loops in the example topology illustrated are disabled by active RSTP components. The
example topology contains three rings, the root and the backup root are components in
each of the three rings. The three rings do not affect one another, a modification to the
topology in one ring does not affect the topology of the other two rings.
–
Rule 3: No more than ten active Spanning Tree components in the topology
when using Spanning Tree default setting
The ability to disintegrate any topology to form a tree without loops requires a complex
protocol that works with several variable timers. These variable timers are dimensioned
using the default values recommended by the IEEE standard so that a topology with a
maximum of fifteen active Spanning Tree components always results in a stable
network. When using large tree, please note the following (see also Section “Large Tree
–
In the large tree support RSTP topology,
only
use devices that
support
large tree.
–
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.
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Switch 1
Root-Bridge
Priorität: 0
Switch 2
Backup-Root-Bridge
Priorität: 4000
Discarding Port
Switch 3
Priorität: Default
Switch 4
Priorität: 40000
Switch 6
Priorität: Default
Switch 5
Priorität: Default
Switch 7
Priorität: 40000
Switch 8
Priorität: Default
Switch 9
Priorität: Default
Switch 10
Priorität: Default
Switch 12
Priorität: Default
Switch 11
Priorität: 40000
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