Phoenix Contact FL SWITCH LM 8TX-E - RSTP Fast Ring Detection

FL SWITCH LM ...
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PHOENIX CONTACT 7278_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 4-8 Example topology
The example topology shown above contains six loops. Each of these loops contains active
STP components, e.g., device 4 and device 2. In this way, all loops are broken by STP.
– 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 dimensioned
using IEEE standard default values so that a topology with a maximum of ten active
Spanning Tree components always results in a stable network.
4.2.2 RSTP Fast Ring Detection
The "RSTP Fast Ring Detection" function can be activated on the "RSTP Configuration"
web page.
This function speeds up the switch-over to a redundant path in the event of an error and
provides easy diagnostics. RSTP fast ring detection provides each ring with an ID, this ID is
made known to each switch in the relevant ring. A switch can belong to several different
rings at the same time.
Structure of the ring ID The ring ID consists of the port number of the blocking port and the MAC address of the
corresponding switch. Advantages of the ring ID:
– Easier to identify redundant paths and locate blocking ports.
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72780009
Root
D
R
Designated Port
Root Port
D
D
D
D
R
R
R
R
LNK MODE
1
2
X1
LNK MODE
1
2
X2
LNK MODE
1
2
X3
LNK MODE
1
2
X4
US1
US2
Fail
Reset
MODE
ACT 100 FD
FL SWITCH MM HS
Ord. No. 28 32 32 6
US2US1 GND GND R1 R2
00A0451BDD
MAC
Address
V.2 4
FL SWITCH MCS 16TX
Ord.No. 28 32 70 0
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
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15
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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
FL SWITCH 5 TX
Ord.No.2832085
US1
US2
FL SWITCH LM 8TX
Ord.-No.2832632
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FL SWITCH 5 TX
Ord.No.2832085
US1
US2
FL SWITCH LM 8TX
Ord.-No.2832632
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8
FL SWITCH 5 TX
Ord.No.2832085
US1
US2
FL SWITCH LM 8TX
Ord.-No.2832632
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