User manual

FL SWITCH MM HS
5-16
PHOENIX CONTACT 6874_en_09
For the last two data path options, no specific precautionary measures are necessary. If
necessary, the "Fast Forwarding" option can be used for the relevant ports (see "Fast
Forwarding" on page 5-13).
For the first three cases, the following rules must be observed:
– Rule 1: Spanning Tree transparency for all infrastructure components
All infrastructure components used in your network that do not actively support
Spanning Tree must be transparent for Spanning Tree messages (BPDUs) and must
forward all BPDUs to all ports without modifying them. When Spanning Tree is
disabled, the switch is transparent for BPDUs.
– 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 5-13 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 settings
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
FLSWITCH MCS 16TX
Ord.No. 28 32 70 0
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
9
11
13
15
10
12
14
16
91610 11 12 13 14 15
18234567
MODE
ACT 100 FD
US1 US2 FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2
FLSWITCH MCS 16TX
Ord.No. 28 32 70 0
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
9
11
13
15
10
12
14
16
91610 11 12 13 14 15
18234567
MODE
ACT 100 FD
US1 US2 FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2
FLSWITCH MCS 16TX
Ord.No.2832700
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
9
11
13
15
10
12
14
16
91610 11 12 13 14 15
18234567
MODE
ACT 100 FD
US1 US2 FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2
FLSWITCH MCS 16TX
Ord.No.2832700
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
9
11
13
15
10
12
14
16
91610 11 12 13 14 15
18234567
MODE
ACT 100 FD
US1 US2 FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2
Switch 1
Root bridge
Priority: 0
Switch 2
Backup root bridge
: 4000Priority
Discarding port
Switch 3
Priority: Default
Switch 4
: 40000Priority
Switch 6
: DefaultPriority
Switch 5
: DefaultPriority
Switch 7
: 40000Priority
Switch 8
: DefaultPriority
Switch 9
: DefaultPriority
Switch 10
: DefaultPriority
Switch 12
: DefaultPriority
Switch 11
: 40000Priority
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