L-DALI User Manual
370
LOYTEC
Version 5.2
LOYTEC electronics GmbH
needs to be plugged into a lower-numbered port than the L-DALI devices are connected to.
If this is not possible, the STP port priority for the cross-connection cable needs to be set to
a low value. The RSTP domain should be restricted to Switch1 and Switch2. This can be
done by enabling a BPDU filter on the port on Upstream Switch 1. This will block all RSTP
packets to enter the upstream network. A sample setup for this topology is shown in Figure
250.
L-DALI
192.168.44.10
1
2
Upstream Switch 1
1
2
3
4
L-DALI
192.168.44.11
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2
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h
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9
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6
8
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.2
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itc
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Direct Ethernet cable between Switch1 and Switch2
L-DALI
192.168.44.12
1
2
Figure 250: Single upstream connection.
Redundant upstream connection
: Switch1 and Switch2 are both connected to the
upstream network, either to two ports on the same switch or to two redundant upstream
switches. In this case, RSTP is needed to ensure a loop-free topology between the upstream
switches, Switch1 and Switch2, so the RSTP domain includes the upstream network and the
chained L-DALI devices. The configuration of Switch1 and Switch2 need to ensure that
they are not selected as the root bridge. If possible device communication should be bound
to a separate VLAN and MSTP (Multiple Spanning Tree Protocol) should be employed to
isolate the spanning tree operations. This topology is shown in Figure 248.
9.3.3 Preconditions
For the fully redundant and ring topology, the following preconditions have to be met:
The upstream switches have to support the Rapid Spanning Tree Protocol (RSTP),
as defined in IEEE 802.1w.
The upstream switches have to provide a broadcast storm filter.
Two distinct switches are required for each end of the device chain.
Both upstream switches are connected to the same Ethernet network.
9.3.4 Switch Settings
The switches which connect the devices to the network need the following settings. Note
that these are only recommendations or starting points. Each network with redundant
connections needs testing and verification to prevent network loops.
